Tutorial%202A(1)

Tutorial%202A(1) - CHEM 281 Tutorial Problem Set No 2...

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CHEM 281 Tutorial Problem Set No. 2 ANSWERS 1. Describe the process of oil refining. Which hydrocarbons are contained in which fractions and how are these separated? Fractional Distillation of Hydrocarbons (refining of crude oil) As we discussed in class, the boiling point of organic molecules increases with the length of the carbon chain. The boiling point reflects the temperature at which the average kinetic energy of the organic molecules is sufficient to overcome the forces of attraction (Van der Waal’s attractions for hydrocarbons), which hold them together in the liquid state. In breaking away from the bulk liquid, these molecules escape from the surface and turn into a gas. Formula Name Boiling Point ( o C) CH 4 methane -161 CH 3 CH 3 ethane - 89 CH 3 CH 2 CH 3 propane - 42 CH 3 CH 2 CH 2 CH 3 butane -0.5 CH 3 CH 2 CH 2 CH 2 CH 3 pentane 36 CH 3 (CH 2 ) 6 CH 3 octane 125 The process of petroleum refining hinges on the separation of the numerous organic molecules present in crude petroleum based on their boiling point. The crude
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This note was uploaded on 11/13/2011 for the course CHEM 281 taught by Professor Williams during the Spring '11 term at Simon Fraser.

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Tutorial%202A(1) - CHEM 281 Tutorial Problem Set No 2...

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