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Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about ________________ mm Hg absolute?

/ Petroleum Refinery Engineering / By
Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about ________________ mm Hg absolute?

A. 1 to 5
B. 30 to 80
C. 250 to 350
D. 450 to 500