4:08 describe how the industrial process of fractional distillation separates crude oil into fractions

The gas goes into the fractional distillation tower. As the gas rises the temperature falls.

Fractions with higher boiling points condense and are collected nearer the bottom of the tower.

Past paper questions on spec point:

Spec	Q'stion	Ans	MS
4:08	Jan '14 (2), Q 5 a	Answer	MkS
4:08	Jan '15 (1), Q 7 a	Answer	MkS
4:08	Jan '16 (2), Q 4 d	Answer	MkS
4:08	Jan '17 (1), Q 11 a	Answer	MkS
4:08	Jan '18 (1), Q 5 a	Answer	MkS
4:08	Jan '18 (1), Q 5 b	Answer	MkS
4:08	May '10 (1), Q 5 c	Answer	MkS
4:08	May '13 (2R), Q 5 a	Answer	MkS
4:08	May '14 (1R), Q 6 a i	Answer	MkS
4:08	May '17 (2R), Q 4 b i	Answer	MkS
4:08	May '17 (2R), Q 4 b ii	Answer	MkS