Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about _______________ mm Hg (absolute)?
Correct answer: B. 30-80
- A. 5-10
- B. 30-80
- C. 150-250
- D. 350-400
Explanation
Vacuum crude distillation commonly operates at about 30–80 mm Hg absolute to lower boiling temperatures and prevent thermal cracking of heavy fractions. Much higher pressures would not provide sufficient vacuum for this purpose.
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