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Continuous process for the preparation of polybutylene terephthalate - or poly butylene isophthalate oligomer
Continuous process for the preparation of polybutylene terephthalate - or poly butylene isophthalate oligomer
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机译:连续法制备聚对苯二甲酸丁二酯或聚间苯二甲酸丁二酯低聚物
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摘要
Economic and efficient process for preparing an oligomer of poly(butylene terephthalate) or an oligomer of poly(butylene isophthalate) from a transesterification reaction mass by using a countercurrent column reactor system wherein the transesterification reaction mass is fed into the countercurrent column reactor and continuously flows downward while simultaneously a heated inert gas stream continuously flows upward to scrub out volatiles from the transesterification reaction mass, thereby yielding from the bottom of the countercurrent column reactor an oligomer of poly(butylene terephthalate) or an oligomer of poly(butylene isophthalate) suitable for use in a polycondensation reaction. Butanediol is recycled throughout the process through an absorber column.
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