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class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">amaga</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navegació </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Portada" title="Visiteu la pàgina principal [z]" accesskey="z"><span>Portada</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Especial:Article_aleatori" title="Carrega una pàgina a l’atzar [x]" accesskey="x"><span>Article a l'atzar</span></a></li><li id="n-Articles-de-qualitat" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Articles_de_qualitat"><span>Articles de 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class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Aparença" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Aparença</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=ca.wikipedia.org&uselang=ca" class=""><span>Donatius</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Crea_compte&returnto=Craqueig" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori" class=""><span>Crea un compte</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Craqueig" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o" class=""><span>Inicia la sessió</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Més opcions" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Eines personals" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Eines personals</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Menú d'usuari" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=ca.wikipedia.org&uselang=ca"><span>Donatius</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Crea_compte&returnto=Craqueig" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Crea un compte</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Craqueig" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Inicia la sessió</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pàgines per a editors no registrats <a href="/wiki/Ajuda:Introducci%C3%B3" aria-label="Vegeu més informació sobre l'edició"><span>més informació</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Especial:Contribucions_pr%C3%B2pies" title="Una llista de les modificacions fetes des d'aquesta adreça IP [y]" accesskey="y"><span>Contribucions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Especial:Discussi%C3%B3_personal" title="Discussió sobre les edicions per aquesta adreça ip. [n]" accesskey="n"><span>Discussió per aquest IP</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Lloc"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contingut" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contingut</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">amaga</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inici</div> </a> </li> <li id="toc-Vegeu_també" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Vegeu_també"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Vegeu també</span> </div> </a> <ul id="toc-Vegeu_també-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referències" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referències"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Referències</span> </div> </a> <ul id="toc-Referències-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Enllaços_externs" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Enllaços_externs"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Enllaços externs</span> </div> </a> <ul id="toc-Enllaços_externs-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contingut" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Taula de continguts" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Commuta la taula de continguts." > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Commuta la taula de continguts.</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Craqueig</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vés a un article en una altra llengua. Disponible en 53 llengües" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-53" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">53 llengües</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AA%D9%83%D8%B3%D9%8A%D8%B1_(%D9%83%D9%8A%D9%85%D9%8A%D8%A7%D8%A1)" title="تكسير (كيمياء) - àrab" lang="ar" hreflang="ar" data-title="تكسير (كيمياء)" data-language-autonym="العربية" data-language-local-name="àrab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Krekinq" title="Krekinq - azerbaidjanès" lang="az" hreflang="az" data-title="Krekinq" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaidjanès" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9A%D1%80%D1%8D%D0%BA%D1%96%D0%BD%D0%B3" title="Крэкінг - belarús" lang="be" hreflang="be" data-title="Крэкінг" data-language-autonym="Беларуская" data-language-local-name="belarús" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9A%D1%80%D0%B5%D0%BA%D0%B8%D0%BD%D0%B3" title="Крекинг - búlgar" lang="bg" hreflang="bg" data-title="Крекинг" data-language-autonym="Български" data-language-local-name="búlgar" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Krakov%C3%A1n%C3%AD" title="Krakování - txec" lang="cs" hreflang="cs" data-title="Krakování" data-language-autonym="Čeština" data-language-local-name="txec" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Krakning" title="Krakning - danès" lang="da" hreflang="da" data-title="Krakning" data-language-autonym="Dansk" data-language-local-name="danès" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Cracken" title="Cracken - alemany" lang="de" hreflang="de" data-title="Cracken" data-language-autonym="Deutsch" data-language-local-name="alemany" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A0%CF%85%CF%81%CF%8C%CE%BB%CF%85%CF%83%CE%B7_(%CF%87%CE%B7%CE%BC%CE%B5%CE%AF%CE%B1)" title="Πυρόλυση (χημεία) - grec" lang="el" hreflang="el" data-title="Πυρόλυση (χημεία)" data-language-autonym="Ελληνικά" data-language-local-name="grec" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Cracking_(chemistry)" title="Cracking (chemistry) - anglès" lang="en" hreflang="en" data-title="Cracking (chemistry)" data-language-autonym="English" data-language-local-name="anglès" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Craqueo" title="Craqueo - espanyol" lang="es" hreflang="es" data-title="Craqueo" data-language-autonym="Español" data-language-local-name="espanyol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Krakkimine" title="Krakkimine - estonià" lang="et" hreflang="et" data-title="Krakkimine" data-language-autonym="Eesti" data-language-local-name="estonià" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Cracking" title="Cracking - basc" lang="eu" hreflang="eu" data-title="Cracking" data-language-autonym="Euskara" data-language-local-name="basc" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%A9%D8%B1%D8%A7%DA%A9%DB%8C%D9%86%DA%AF" title="کراکینگ - persa" lang="fa" hreflang="fa" data-title="کراکینگ" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Krakkaus_(kemia)" title="Krakkaus (kemia) - finès" lang="fi" hreflang="fi" data-title="Krakkaus (kemia)" data-language-autonym="Suomi" data-language-local-name="finès" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Craquage" title="Craquage - francès" lang="fr" hreflang="fr" data-title="Craquage" data-language-autonym="Français" data-language-local-name="francès" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Scoilteadh_catala%C3%ADoch" title="Scoilteadh catalaíoch - irlandès" lang="ga" hreflang="ga" data-title="Scoilteadh catalaíoch" data-language-autonym="Gaeilge" data-language-local-name="irlandès" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Craqueamento" title="Craqueamento - gallec" lang="gl" hreflang="gl" data-title="Craqueamento" data-language-autonym="Galego" data-language-local-name="gallec" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A4%D7%99%D7%A6%D7%95%D7%97_%D7%A4%D7%97%D7%9E%D7%99%D7%9E%D7%A0%D7%99%D7%9D" title="פיצוח פחמימנים - hebreu" lang="he" hreflang="he" data-title="פיצוח פחמימנים" data-language-autonym="עברית" data-language-local-name="hebreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Krekiranje" title="Krekiranje - croat" lang="hr" hreflang="hr" data-title="Krekiranje" data-language-autonym="Hrvatski" data-language-local-name="croat" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Krakaj" title="Krakaj - crioll d’Haití" lang="ht" hreflang="ht" data-title="Krakaj" data-language-autonym="Kreyòl ayisyen" data-language-local-name="crioll d’Haití" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Krakkol%C3%A1s" title="Krakkolás - hongarès" lang="hu" hreflang="hu" data-title="Krakkolás" data-language-autonym="Magyar" data-language-local-name="hongarès" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BF%D6%80%D5%A5%D5%AF%D5%AB%D5%B6%D5%A3" title="Կրեկինգ - armeni" lang="hy" hreflang="hy" data-title="Կրեկինգ" data-language-autonym="Հայերեն" data-language-local-name="armeni" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Perengkahan" title="Perengkahan - indonesi" lang="id" hreflang="id" data-title="Perengkahan" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesi" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Cracking_(chimica)" title="Cracking (chimica) - italià" lang="it" hreflang="it" data-title="Cracking (chimica)" data-language-autonym="Italiano" data-language-local-name="italià" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%AF%E3%83%A9%E3%83%83%E3%82%AD%E3%83%B3%E3%82%B0_(%E5%8C%96%E5%AD%A6)" title="クラッキング (化学) - japonès" lang="ja" hreflang="ja" data-title="クラッキング (化学)" data-language-autonym="日本語" data-language-local-name="japonès" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%99%E1%83%A0%E1%83%94%E1%83%99%E1%83%98%E1%83%9C%E1%83%92%E1%83%98" title="კრეკინგი - georgià" lang="ka" hreflang="ka" data-title="კრეკინგი" data-language-autonym="ქართული" data-language-local-name="georgià" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9A%D1%80%D0%B5%D0%BA%D0%B8%D0%BD%D0%B3" title="Крекинг - kazakh" lang="kk" hreflang="kk" data-title="Крекинг" data-language-autonym="Қазақша" data-language-local-name="kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%81%AC%EB%9E%98%ED%82%B9_(%ED%99%94%ED%95%99)" title="크래킹 (화학) - coreà" lang="ko" hreflang="ko" data-title="크래킹 (화학)" data-language-autonym="한국어" data-language-local-name="coreà" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%9A%D1%80%D0%B5%D0%BA%D0%B8%D0%BD%D0%B3" title="Крекинг - kirguís" lang="ky" hreflang="ky" data-title="Крекинг" data-language-autonym="Кыргызча" data-language-local-name="kirguís" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Krekingas" title="Krekingas - lituà" lang="lt" hreflang="lt" data-title="Krekingas" data-language-autonym="Lietuvių" data-language-local-name="lituà" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Krekings" title="Krekings - letó" lang="lv" hreflang="lv" data-title="Krekings" data-language-autonym="Latviešu" data-language-local-name="letó" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Peretakan" title="Peretakan - malai" lang="ms" hreflang="ms" data-title="Peretakan" data-language-autonym="Bahasa Melayu" data-language-local-name="malai" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Kraken_(scheikunde)" title="Kraken (scheikunde) - neerlandès" lang="nl" hreflang="nl" data-title="Kraken (scheikunde)" data-language-autonym="Nederlands" data-language-local-name="neerlandès" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Krakking" title="Krakking - noruec nynorsk" lang="nn" hreflang="nn" data-title="Krakking" data-language-autonym="Norsk nynorsk" data-language-local-name="noruec nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Krakking" title="Krakking - noruec bokmål" lang="nb" hreflang="nb" data-title="Krakking" data-language-autonym="Norsk bokmål" data-language-local-name="noruec bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%AD%E0%A9%B0%E0%A8%9C%E0%A8%A3_(%E0%A8%B0%E0%A8%B8%E0%A8%BE%E0%A8%87%E0%A8%A3%E0%A8%95)" title="ਭੰਜਣ (ਰਸਾਇਣਕ) - panjabi" lang="pa" hreflang="pa" data-title="ਭੰਜਣ (ਰਸਾਇਣਕ)" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="panjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Kraking" title="Kraking - polonès" lang="pl" hreflang="pl" data-title="Kraking" data-language-autonym="Polski" data-language-local-name="polonès" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Craqueamento" title="Craqueamento - portuguès" lang="pt" hreflang="pt" data-title="Craqueamento" data-language-autonym="Português" data-language-local-name="portuguès" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Cracare" title="Cracare - romanès" lang="ro" hreflang="ro" data-title="Cracare" data-language-autonym="Română" data-language-local-name="romanès" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9A%D1%80%D0%B5%D0%BA%D0%B8%D0%BD%D0%B3" title="Крекинг - rus" lang="ru" hreflang="ru" data-title="Крекинг" data-language-autonym="Русский" data-language-local-name="rus" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Krekovanje_(hemija)" title="Krekovanje (hemija) - serbocroat" lang="sh" hreflang="sh" data-title="Krekovanje (hemija)" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbocroat" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Cracking_(chemistry)" title="Cracking (chemistry) - Simple English" lang="en-simple" hreflang="en-simple" data-title="Cracking (chemistry)" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Krakovanie" title="Krakovanie - eslovac" lang="sk" hreflang="sk" data-title="Krakovanie" data-language-autonym="Slovenčina" data-language-local-name="eslovac" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Kreking" title="Kreking - eslovè" lang="sl" hreflang="sl" data-title="Kreking" data-language-autonym="Slovenščina" data-language-local-name="eslovè" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9A%D1%80%D0%B5%D0%BA%D0%BE%D0%B2%D0%B0%D1%9A%D0%B5_(%D1%85%D0%B5%D0%BC%D0%B8%D1%98%D0%B0)" title="Крековање (хемија) - serbi" lang="sr" hreflang="sr" data-title="Крековање (хемија)" data-language-autonym="Српски / srpski" data-language-local-name="serbi" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Krackning" title="Krackning - suec" lang="sv" hreflang="sv" data-title="Krackning" data-language-autonym="Svenska" data-language-local-name="suec" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-szl mw-list-item"><a href="https://szl.wikipedia.org/wiki/Kraking" title="Kraking - silesià" lang="szl" hreflang="szl" data-title="Kraking" data-language-autonym="Ślůnski" data-language-local-name="silesià" class="interlanguage-link-target"><span>Ślůnski</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Kraking" title="Kraking - turc" lang="tr" hreflang="tr" data-title="Kraking" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/Kreking" title="Kreking - tàtar" lang="tt" hreflang="tt" data-title="Kreking" data-language-autonym="Татарча / tatarça" data-language-local-name="tàtar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9A%D1%80%D0%B5%D0%BA%D1%96%D0%BD%D0%B3" title="Крекінг - ucraïnès" lang="uk" hreflang="uk" data-title="Крекінг" data-language-autonym="Українська" data-language-local-name="ucraïnès" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Kreking" title="Kreking - uzbek" lang="uz" hreflang="uz" data-title="Kreking" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Cracking_(h%C3%B3a_h%E1%BB%8Dc)" title="Cracking (hóa học) - vietnamita" lang="vi" hreflang="vi" data-title="Cracking (hóa học)" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E8%A3%82%E5%8C%96%E5%8F%8D%E5%BA%94" title="裂化反应 - xinès" lang="zh" hreflang="zh" data-title="裂化反应" data-language-autonym="中文" data-language-local-name="xinès" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q212749#sitelinks-wikipedia" title="Modifica enllaços interlingües" class="wbc-editpage">Modifica els enllaços</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div 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class="mw-list-item"><a href="/w/index.php?title=Craqueig&printable=yes" title="Versió per a impressió d'aquesta pàgina [p]" accesskey="p"><span>Versió per a impressora</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> En altres projectes </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Cracking_(chemistry)" hreflang="en"><span>Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q212749" title="Enllaç a l'element del repositori de dades connectat [g]" accesskey="g"><span>Element a Wikidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Eines de la pàgina"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aparença"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aparença</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">amaga</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">De la Viquipèdia, l'enciclopèdia lliure</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ca" dir="ltr"><figure typeof="mw:File/Thumb"><a href="/wiki/Fitxer:Russian_Cracking.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/a/a5/Russian_Cracking.jpg" decoding="async" width="239" height="251" class="mw-file-element" data-file-width="239" data-file-height="251" /></a><figcaption>Refineria de <a href="/w/index.php?title=Vladimir_Sh%C3%BAjov&action=edit&redlink=1" class="new" title="Vladimir Shújov (encara no existeix)">Shújov</a> de craqueig, <a href="/wiki/Bak%C3%BA" title="Bakú">Bakú</a>, <a href="/wiki/Uni%C3%B3_de_Rep%C3%BAbliques_Socialistes_Sovi%C3%A8tiques" title="Unió de Repúbliques Socialistes Soviètiques">Unió de Repúbliques Socialistes Soviètiques</a>, <a href="/wiki/1934" title="1934">1934</a></figcaption></figure> <p>El <b>craqueig</b> (<b>cracking</b>) és un <a href="/wiki/Proc%C3%A9s_qu%C3%ADmic" title="Procés químic">procés químic</a> pel qual es trenquen <a href="/wiki/Mol%C3%A8cules" class="mw-redirect" title="Molècules">molècules</a> d'un <a href="/wiki/Compost_qu%C3%ADmic" title="Compost químic">compost químic</a>, i es produeixen així compostos més simples.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> El procediment original, encara en ús, emprava <a href="/wiki/Calor" title="Calor">calor</a> i <a href="/wiki/Pressi%C3%B3" title="Pressió">pressió</a> i es denomina <i>craqueig tèrmic</i> a una temperatura de 850-900 °C (<i>craqueig de <a href="/wiki/Vlad%C3%ADmir_X%C3%BAkhov" title="Vladímir Xúkhov">Xúkhov</a></i>). Després es va idear un nou mètode: <a href="/wiki/Cracking_catal%C3%ADtic" class="mw-redirect" title="Cracking catalític"><i>craqueig catalític</i></a> a una temperatura de 450-500 °C, que utilitza un <a href="/wiki/Catalitzador" title="Catalitzador">catalitzador</a> (substància que determina en altres canvis químics sense modificar-la). En el cas d'aquest tipus de craqueig, el catalitzador —com l'<a href="/wiki/Al%C3%BAmina" class="mw-redirect" title="Alúmina">alúmina</a> (Al₂O₃) o el <a href="/wiki/Di%C3%B2xid_de_silici" title="Diòxid de silici">diòxid de silici</a> (SiO₂— és una espècie d'<a href="/wiki/Argila" title="Argila">argila</a> que pot donar-se en forma de terroses píndoles de grans petits o com una pols super fina i l'acció desintegradora sumada a la de la calor i la pressió, afavoreix el fraccionament en components més lleugers i produeix més i millor compost com a resultat. </p><p>Una modalitat moderna de craqueig catalític del <a href="/wiki/Petroli" title="Petroli">petroli</a> és el <a href="/wiki/Craqueig_catal%C3%ADtic_fluid" title="Craqueig catalític fluid">procés catalític fluid</a>. Aquest utilitza un "<i>fluid catalytic cracker</i>", que és una instal·lació de, en alguns casos, fins a seixanta metres d'alçada. Al llarg de quilòmetres de canonades i reactors circulen a elevades temperatures grans quantitats de <a href="/wiki/Vapor_(estat)" class="mw-redirect" title="Vapor (estat)">vapor</a>, <a href="/wiki/Aire" title="Aire">aire</a> i <a href="/wiki/Catalitzador" title="Catalitzador">catalitzador</a> polvoritzat. A determinada alçada de l'operació els finíssims grans del catalitzador es revesteixen de <a href="/wiki/Carb%C3%B3" title="Carbó">carbó</a> separat del <a href="/wiki/Petroli" title="Petroli">petroli</a>, i llavors deixen d'actuar mitjançant l'acció d'un regenerador, però, es crema i consumeix el carbó, el catalitzador queda novament en condicions de funcionar per a properes ocasions. </p><p>En el procés fluid el catalitzador és tan fi que quan és agitat en mescla amb aire o altres gasos, augmenta el seu volum i flueix com un líquid podent que ha de ser controlat per vàlvules. Aquesta manera de treballar amb una substància sòlida com si es tractés d'un fluid ha constituït un progrés de les tasques de <a href="/wiki/Refineria" class="mw-redirect" title="Refineria">refineria</a>. </p><p>El craqueig del petroli permet obtenir d'un barril de <a href="/wiki/Petroli_cru" class="mw-redirect" title="Petroli cru">petroli cru</a> una quantitat dues vegades més gran que l'extreta per simple <a href="/wiki/Destil%C2%B7laci%C3%B3" title="Destil·lació">destil·lació</a>. Actualment és un procediment fonamental per a la producció de gasolina d'alt <a href="/wiki/%C3%8Dndex_d%27oct%C3%A0" title="Índex d'octà">octanatge</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Vegeu_també"><span id="Vegeu_tamb.C3.A9"></span>Vegeu també</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Craqueig&action=edit&section=1" title="Modifica la secció: Vegeu també"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Coc_de_petroli" title="Coc de petroli">Coc de petroli</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Referències"><span id="Refer.C3.A8ncies"></span>Referències</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Craqueig&action=edit&section=2" title="Modifica la secció: Referències"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist" style="list-style-type: decimal;"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text">Immaculada Julián <a rel="nofollow" class="external text" href="http://books.google.cat/books?id=VmdvQfFbq9UC&pg=PA176&dq=Craqueo&hl=ca&ei=uGZATPLwDYaT4gaW64mLDg&sa=X&oi=book_result&ct=result&resnum=8&ved=0CEgQ6AEwBzgK#v=onepage&q=Craqueo&f=false">Diccionario de química.</a> books.google.cat</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Enllaços_externs"><span id="Enlla.C3.A7os_externs"></span>Enllaços externs</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Craqueig&action=edit&section=3" title="Modifica la secció: Enllaços externs"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://science.howstuffworks.com/oil-refining5.htm">Information on cracking in oil refining</a> from howstuffworks.com</li> <li><a rel="nofollow" class="external text" href="http://canadaconnects.ca/chemistry/10105/">Hydrocarbon Cracking - A Quick Summary for High School Students</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20070427111502/http://canadaconnects.ca/chemistry/10105/">Arxivat</a> 2007-04-27 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. from canadaconnects.ca</li> <li><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="http://www.shukhov.org/shukhov.html">The Shukhov Tower Foundation</a>».</span> from shukhov.org</li></ul> <div role="navigation" class="navbox" aria-label="Navbox" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Control_d%27autoritats" title="Control d'autoritats">Registres d'autoritat</a></th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Biblioth%C3%A8que_nationale_de_France" class="mw-redirect" title="Bibliothèque nationale de France">BNF</a> (<a rel="nofollow" class="external text" href="https://catalogue.bnf.fr/ark:/12148/cb11953121v">1</a>)</li> <li><a href="/wiki/LCCN" class="mw-redirect" title="LCCN">LCCN</a> (<a rel="nofollow" class="external text" href="https://id.loc.gov/authorities/sh85033709">1</a>)</li> <li><a href="/wiki/Biblioteca_Nacional_de_la_Rep%C3%BAblica_Txeca" title="Biblioteca Nacional de la República Txeca">NKC</a> (<a rel="nofollow" class="external text" href="https://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica=ph608655&CON_LNG=ENG">1</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Bases d'informació</th><td class="navbox-list navbox-even" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/GEC" class="mw-redirect" title="GEC">GEC</a> (<a rel="nofollow" class="external text" href="https://www.enciclopedia.cat/gran-enciclopedia-catalana/craqueig">1</a>)</li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; 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