Which improper operation does not lead to exposure to chemicals?

A) Tower not vented
B) No cooling liquid on condenser
C) Rapid changes in column control and set points
D) Opening a bleed valve on a vacuum column


Answer: D
Explanation: A) Incorrect. Tower not vented can lead to exposure to chemicals.
B) Incorrect. No cooling liquid on condenser can lead to exposure to chemicals.
C) Incorrect. Rapid changes in column control and set points can lead to exposure to chemicals.
D) Correct. Opening a bleed valve on a vacuum pressure column will not lead to exposure to chemicals.

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