One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 500
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Single-choice question: When the calcium carbide process VCM conversion and synthesis system is shut down, the temperature inside the converter drops, and the gas contracts to form ( ). This often causes the steam-saturated crude vinyl chloride vapor in the water-alkali scrubber to be pushed back into the converter; sometimes water also enters the converter, with serious consequences. Therefore, it is essential to ensure that the converter remains ( ). A. Positive pressure, positive pressure B. Negative pressure, positive pressure C. Positive pressure, negative pressure D. Negative pressure, negative pressure Answer: B. Negative pressure, positive pressure
When the calcium carbide process VCM conversion and synthesis system is shut down, the temperature inside the converter drops, and the gas contracts to form (B). This often causes the steam-saturated crude vinyl chloride vapor in the water-alkali scrubber to be pushed back into the converter; sometimes water also flows in as well. The consequences can be severe, so it is essential to ensure that the converter remains in state (B)