Can someone explain fractional distillation of crude oil please??

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I only understand the part where crude oil is continuously pumped in at the bottom, and within the crude oil, there are different compounds with different boiling points.....melting points?? I'm scared as there might be 6 mark question on it tomorrow, and I don't know how to sentence it!!! Please help!! Thank you!!!
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loshaw20
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•Separatingout crude oils into hydrocarbons with similar this boiling points called fractions. Wecall this process fractional distillation•Eachhydrocarbon has a different BP because of the different molecule sizes•Crudeoils is fed in at the bottom of the column at 400 degrees as hot vapour.•Thecolumn is very hot near the bottom and gets cooler as it goes up•Thegases condense when they reach the temperature of their boiling points, so thedifferent fractions are collected as liquids at different levels•Crudeoils enters the column and leaves as a fraction continuously.•Hydrocarbonswith the smallest chains condense at the top because they have smallest boilingpoints. At the bottom are the hydrocarbons with large boiling points and sothey will also be thick and viscous.
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(Original post by loshaw20)
•Separatingout crude oils into hydrocarbons with similar this boiling points called fractions. Wecall this process fractional distillation•Eachhydrocarbon has a different BP because of the different molecule sizes•Crudeoils is fed in at the bottom of the column at 400 degrees as hot vapour.•Thecolumn is very hot near the bottom and gets cooler as it goes up•Thegases condense when they reach the temperature of their boiling points, so thedifferent fractions are collected as liquids at different levels•Crudeoils enters the column and leaves as a fraction continuously.•Hydrocarbonswith the smallest chains condense at the top because they have smallest boilingpoints. At the bottom are the hydrocarbons with large boiling points and sothey will also be thick and viscous.
Ahhhhh! Perfect!! I understand now!!! Thank you so much !!! )
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