Which improper operation can lead to air in column?
A) Rapid changes in column control and set points
B) Opening a bleed valve on a vacuum column
C) No cooling liquid on condenser
D) Operation of column bottoms level too high or too low
Answer: B
Explanation: A) Incorrect. Opening a bleed valve on a vacuum column can lead air in the column.
B) Correct. Opening a bleed valve on a vacuum column can lead air in the column.
C) Incorrect. Opening a bleed valve on a vacuum column can lead air in the column.
D) Incorrect. Opening a bleed valve on a vacuum column can lead air in the column.
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