Crude topping column operates at ________________ pressure?
Correct answer: A. Atmospheric
- A. Atmospheric
- B. 10 atm
- C. Vacuum
- D. 3 atm
Explanation
A crude topping column performs the initial atmospheric distillation of crude oil, separating gases, naphtha, kerosene and gas oils near atmospheric pressure. Vacuum operation is used later for heavy atmospheric residue to avoid excessive thermal cracking.
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