level: fractional distillation of crude oil
Questions and Answers List
level questions: fractional distillation of crude oil
| Question | Answer |
|---|---|
| describe the stages of fractional distillation of crude oil | - crude oil is heated to a very high temp so it boils and all hydrocarbons evaporate and turn into a gas - crude oil vapour is fed into the fractional distillation column which is hotter at the bottom (350) and cooler at the top (25) - hydrocarbon vapours rise up the column + condense when they reach their boiling point - liquid fractions are removed and remaining hydrocarbons continue to rise up the column until they reach their boiling point and condense |
| where are long chain hydrocarbons removed and why | at the bottom as they have very high boiling points |
| where are short chain hydrocarbons removed and why | at the top as gases as they have very low boiling points and do not condense |
| can can some fractions be used for | fuels and feedstock |
| what is a feedstock | a chemical used to make other chemicals |
| give examples of fuels that can be made | petrol, diesel, kerosene, heavy fuel oil, liquified petroleum gas |
| give examples of feedstock that can be made | solvants, lubricants, detergents, polymers |
| what is the temp around at the top of the column | 25 degrees celsius |
| what is the temp around at the bottom of the column | 350 degrees celsius |