科研之友
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摘要
A dynamic process model has been developed for a continuous solid-state step-growth polymerization of bisphenol-A polycarbonate in a moving-packed-bed reactor. In this process, the molecular weight of polycarbonate prepolymer particles is increased as they move downward in a vertical reactor. A heated purge gas is supplied to the bottom of the reactor and flows upward at a high flow rate to remove volatile condensates from the polymer particles and provide thermal energy for the solid-state polymerization. A macroscopic reactor model and a polymer particle model are combined and solved together to calculate the reactor temperature profiles and the polymer-molecular-weight properties. The effects of reactor design and operation parameters on the performance of the solid-state polymerization reactor are analyzed through model simulations. It is shown that a large-scale moving-packed-bed reactor can have a significant temperature nonuniformity in the reactor, particularly during the startup operation, affecting the uniformity of the molecular weight of the polymer in the product.
- 出版日期2008-5-21
