Cracking crude oils

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Chemistry

GCSE Chemistry

AQA

Organic Chemistry

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9 Terms

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What is cracking?

Thermal decomposition - breaking down of long-chain alkanes into alkenes and shorter-chain alkanes

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What types of cracking are there?

Thermal and Catalytic

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How to use catalytic cracking?

  1. Heat the long term hydrocarbons until it is vaporised (turned into a gas)
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  1. Pass vapoured hydrocarbons over the catalyst (hot powdered aluminium oxide)
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  1. As the long hydrocarbons come into contact with the catalyst they will split apart into two smaller hydrocarbons
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How to use steam cracking?

  1. Heat the long term hydrocarbons until it is vaporised (turned into a gas)
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  1. Mix them with steam
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  1. Heat them to a very high temperature = long hydrocarbon chains split apart
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Balanced chemical equations for cracking

Long chain alkane --> shorter alkane + alkene