Organic Chemistry 0.0 / 5 ? ChemistryOrganic and Green ChemistryGCSEAQA Created by: 3mily05Created on: 04-12-19 19:11 Fractional Distillation ... 1 of 10 Fractional distillation Separating crude oil using the different boiling points of alkane fractions 2 of 10 Fraction Alkanes that all have similar boiling point (and therefore chain length) 3 of 10 Fractional distillation - Ordered: ... 4 of 10 1. The column is cooler at the top than the bottom 5 of 10 2. The crude oil is heated to evaporate it 6 of 10 3. Vapours rise and as they rise the vapours cool 7 of 10 4. As they cool the fractions condense at their boiling points, and leave the column 8 of 10 5. Large hydrocarbons have high boiling points so condense at the bottom 9 of 10 6. Small hydrocarbons have lower boiling points so condense at the top 10 of 10
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