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31. 发明授权

US4204070A Process for preparing polyethylene terephthalate and its low molecular weight oligomers 失效
标题翻译：制备聚对苯二甲酸乙二醇酯及其低分子量低聚物的方法
公开(公告)号：US4204070A
公开(公告)日：1980-05-20
申请号：US679612
申请日：1976-04-23
申请人： Fumiyuki Suzuki , Toshimitu Okutu , Keitaro Ohe
发明人： Fumiyuki Suzuki , Toshimitu Okutu , Keitaro Ohe
IPC分类号： C07C67/08 , C07C69/82
CPC分类号： C07C69/82 , C07C67/08
摘要： A process for preparing bis(hydroxyethyl)terephthalate and its low molecular weight oligomers in a reactor equipped with a rectifying column which comprises suspending or dissolving terephthalic acid in molten bis(hydroxyethyl)terephthalate and its low molecular weight oligomers at a temperature above the dew point of ethylene glycol and feeding gaseous or liquid ethylene glycol into the suspension or the solution to react it with the terephthalic acid, where the amount of ethylene glycol fed into the reactor is controlled so as to maintain the temperature inside the rectifying column at a temperature at which the ethylene glycol does not substantially distill off from the rectifying column and the partial pressure of the ethylene glycol is maximized.
摘要翻译：一种在装有精馏塔的反应器中制备双（羟乙基）对苯二甲酸酯及其低分子量低聚物的方法，该方法包括将对苯二甲酸在高于露点的温度下将对苯二甲酸悬浮或溶解在熔融的双（羟乙基）对苯二甲酸酯及其低分子量低聚物中的乙二醇，并将气态或液态乙二醇加入悬浮液或溶液中以与对苯二甲酸反应，其中进料到反应器中的乙二醇的量被控制以便将精馏塔内部的温度保持在其中乙二醇基本上不从精馏塔中蒸馏出来，并且乙二醇的分压最大化。

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