click below
click below
Normal Size Small Size show me how
Petroleum
Unit 2
| Question | Answer |
|---|---|
| Fractional distillation | vaporized at 350C, different chain lengths condense at different temperatures. Fractions draw off at different levels |
| Cracking | breaking longer chained hydrocarbons into shorter chained hydrocarbons |
| catalytic cracking | hydrocarbons are passed over a catalyst before being cracked. |
| Problems with straight chained alkanes | tend to auto ignite resulting in knocking |
| How to reduce knocking | use branched and cyclic alkanes to create a higher octane rating. |
| Isomerisation | straight chained alkanes are converted into branched alkanes |
| reforiming | straight chained alkanes are converted into cyclic alkanes. |