Chemistry C1b- Cracking Crude Oil

Cracking means splitting up long-chain hydrocarbons by passing vapour over a hot catalyst.
1. ~Firstly you heat the long-chain hydrocarbons to vaporise it. ~Then the vapour is passed over a powdered catalyst at a temperature of about 400-700 degrees Celsius. ~Aluminium Oxide is the catalyst used. ~ The long-chain molecules split apart on the surface of the specks of catalyst.
Long-chain hydrocarbons form thick gloopy liquids which aren't useful, so a lot of the longer molecules produced from fractional distillation are turned into smaller ones by the process of cracking.
Some of the products of cracking are useful as fuels: such as petrol and paraffin. Cracking produces substances like ethane too, which are needed for making plastics.
Cracking is a thermal decomposition reaction - breaking down molecules by heating them.
Most of the products of cracking are alkanes and unsaturated hydrocarbons called alkenes.

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	Created by ellie.adams1 about 11 years ago