Cracking crude oil
- Created by: jaaaz_v
- Created on: 08-06-15 22:21
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- Cracking Crude Oil
- Long-chain hydrocarbons make thick and gloopy liquids
- Aren't useful to us
- The long chains that are made in fractional distillation are turned into smaller ones using cracking
- So that they're of use to us
- Cracking produces substances like ethene
- Which we need for making plastics
- Cracking is a thermal decomposition reaction
- Which is breaking molecules down by heating them
- The long-chain hydrocarbons need to be heated to vapourise them
- Vapourise = turn them into a gas
- The vapour is them passed over a powdered catalyst
- At temperatures around 400°-700°
- Long-chain molecules split apart on the surface of the specs of catalyst
- Aluminuim oxide is that catalyst used
- At temperatures around 400°-700°
- Most of the products of cracking are alkanes
- And unsaturated hydrocarbons called alkenes
- An alternative way of cracking is by mixing the vapour with steam at v high temperatures
- Long-chain hydrocarbons make thick and gloopy liquids
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