Discussion
Vacuum distillation is applied to the atmospheric residue in order to
Answer: C
Correct answer: separate further fractions without cracking
Above about 350 degrees the heavier molecules begin to crack thermally, so the atmospheric column cannot be pushed further. Reducing the pressure lowers the boiling points, allowing vacuum gas oil to be taken overhead at a temperature the molecules survive. It is a physical separation throughout - nothing is converted, and the sulphur and octane options describe other units entirely.
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