Alkanes Chemistry AS
- Created by: Ciara
- Created on: 26-11-14 19:32
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- Alkanes
- Hydrocarbons from crude oil
- A hydrocarbon is a compound consisting of hydrogen and carbon only
- Refining crude oil
- Petroleum is a mixture consisting mainly of alkane hydrocarbons
- Pertroleum fraction: mixture of hydrocarbons with a similar chain length and boiling point range
- Step of producing crude oil
- 1) oil is pre- heated
- 2) then passed into column
- 3) The fractions condense at different height
- 4) The temperature of column decreases upwards
- 5) The separation depends on boiling point
- 6) Boiling point depends on size of molecules
- 7) The larger the molecule the larger the van der waals forces
- 8) Similar molecules ( size, bp, mass) condense together
- 9) Small molecules condense at the top at lower temperature
- 10) and big molecules condense at the bottom at higher temperatures
- this is a physical process involving the splitting of weak van der waals forces between molecules
- Untitled
- Hydrocarbons from crude oil
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