PET缩聚过程脱挥方式比较——抽真空及通氮气  

Comparison of the way of removing small molecules in PET polycondensation process ——pumping vacuum and purging with nitrogen gas

作　　者：赵玲[1] 沈瀛坪[1] 朱中南[1] 戴迎春[1] 

机构地区：[1]华东理工大学联合化学反应工程研究所,上海200237

出　　处：《聚酯工业》1999年第3期17-20,共4页Polyester Industry

摘　　要：抽真空及通氮气是 Ｐ Ｅ Ｔ缩聚过程脱除小分子的两种方式， Ｐ Ｅ Ｔ 间歇缩聚实验研究表明：通氮气脱挥时聚合度一直上升，而抽真空脱挥时聚合度趋向某定值；脱挥速度与通氮位置有关；通氮气脱挥得到的聚合物比抽真空脱挥得到的色泽白。pumping vacuum and purging with nitrogen gas are two ways of removing small molecules from PET melts in PET polycondensation.Experiments of batch PET polycondensation show:The degree of polymerization is up continuously when small molecules is removed by purging with N 2,the degree of polymerization is up to a maximum value when small molecules is removed by pumping vacuum.The rate of removing small molecules is correlated to the position of leading N 2.The color of PET products obtained by purging with N 2 is better than by pumping vacuum.

关 键 词：PET 缩聚 聚合度 抽真空 通氮气 聚酯纤维 

分 类 号：TQ342.206[化学工程—化纤工业]