395077
Descrição
Criado por ellie.adams1
|
Criado por ellie.adams1
quase 13 anos atrás
|
|
Chemistry C1b-
Cracking Crude Oil
- Cracking means splitting
up long-chain
hydrocarbons by passing
vapour over a hot catalyst.
- ~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.
- ~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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