公开(公告)号：US5413681A

公开(公告)日：1995-05-09

申请号：US151637

申请日：1993-11-15

申请人： Gerald C. Tustin ,  Thomas M. Pell, Jr. ,  David A. Jenkins ,  Mary T. Jernigan

发明人： Gerald C. Tustin ,  Thomas M. Pell, Jr. ,  David A. Jenkins ,  Mary T. Jernigan

IPC分类号： B01D3/00 ,  B01D3/14 ,  C07C51/09

CPC分类号： C07C51/09 ,  B01D3/009 ,  B01D3/146 ,  C08J11/14 ,  C08J2367/02 ,  Y02P20/127 ,  Y02W30/704 ,  Y10S203/13 ,  Y10S203/17

摘要： A process useful for the recovery of terephthalic acid and ethylene glycol from poly(ethylene terephthalate) or its copolymers. The process is economical, beneficial to the environment and provides polymer grade terephthalic acid and ethylene glycol from post-consumer resin. The process is a six-step process including: (1) contacting a resin containing poly(ethylene terephthalate) with water at elevated temperature and pressure, (2) cooling the resulting mixture to provide a solid portion containing terephthalic acid and a liquid portion containing ethylene glycol, (3) recovery of the ethylene glycol from the liquid portion by distillation, (4) recovery of the terephthalic acid by heating the solid portion in the presence of water vapor at elevated temperature to produce a vapor containing terephthalic acid and water, (5) cooling terephthalic acid water vapor mixture to a temperature below the dew point of terephthalic acid and (6) collecting the polymer grade terephthalic acid. The polymer grade terephthalic acid and ethylene glycol provided by this process can be used to make high quality terephthalate homopolymers or copolymers for applications including clear bottles and fibers.

摘要翻译： 用于从聚对苯二甲酸乙二醇酯或其共聚物中回收对苯二甲酸和乙二醇的方法。 该方法是经济的，有利于环境，并提供来自消费后树脂的聚合物级对苯二甲酸和乙二醇。 该方法是六步法，其包括：（1）在升高的温度和压力下使包含聚对苯二甲酸乙二醇酯的树脂与水接触，（2）冷却所得混合物以提供含有对苯二甲酸的固体部分和含有 乙二醇，（3）通过蒸馏从液体部分回收乙二醇，（4）通过在水蒸汽存在下在高温下加热固体部分来回收对苯二甲酸，以产生含有对苯二甲酸和水的蒸汽， （5）将对苯二甲酸水蒸气混合物冷却至低于对苯二甲酸露点的温度，和（6）收集聚合物级对苯二甲酸。 通过该方法提供的聚合物级对苯二甲酸和乙二醇可用于制备用于包括透明瓶和纤维的应用的高质量对苯二甲酸酯均聚物或共聚物。