One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； July 19
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Multiple-choice question: During the production of polyvinyl chloride by the suspension method, after adding monomer and dispersant to the polymerization reactor, if the system becomes unstable for some reason, it is not possible to add an initiator at this point; instead, a ( ) operation must be carried out. A. Vacuum pumping B. Batch recovery C. Steam purging D. Pressure relief discharge Answer: B. Batch recovery
During the suspension method for PVC production, after adding the monomer and dispersant to the polymerization reactor, the system becomes unstable for some reason; at this point, it is not possible to add an initiator, and therefore (B) operation must be carried out. A. Vacuum pumping B. Batch recovery C. Steam purging D. Pressure relief discharge