In an operating distillation column, the______________________?
Correct answer: C. Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from
- A. Vapors and liquids are at their dew point and bubble point respectively
- B. Driving force for the liquid flow is its specific weight
- C. Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from
- D. the bottom to the top of the column
- E. Highest temperature is encountered at the top of the column
Explanation
Vapour rises through a distillation column because the pressure is slightly higher at the bottom and decreases toward the top, providing the pressure-gradient driving force. The highest temperature is normally at the bottom, not the top; the line labelled d appears to continue option c.
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