公开(公告)号：US5554657A

公开(公告)日：1996-09-10

申请号：US436078

申请日：1995-05-08

申请人： Thomas F. Brownscombe ,  Howard L. Fong ,  Zaida Diaz ,  Hoe H. Chuah ,  Raymond L. June ,  Kevin L. Rollick ,  Thomas C. Semple ,  Mark R. Tompkin

发明人： Thomas F. Brownscombe ,  Howard L. Fong ,  Zaida Diaz ,  Hoe H. Chuah ,  Raymond L. June ,  Kevin L. Rollick ,  Thomas C. Semple ,  Mark R. Tompkin

IPC分类号： B09B3/00 ,  C08J11/02 ,  C08J11/08 ,  C08K5/00 ,  C08K5/10 ,  C08L67/00 ,  C08L67/02 ,  C08J11/04 ,  B03D1/08

CPC分类号： C08J11/08 ,  C08J2367/02 ,  Y02W30/701

摘要： The invention described herein provides a process for recycling a mixed polymer recycle stream containing polyester polymers, particularly polyethylene terephthalate (PET) typically in the form of carbonated soft drink or other containers. This novel process includes the steps of: (1) contacting the mixed polymer recycle stream with a solvent which selectively dissolves the PET. (2) separating the selective solvent containing PET from the residual mixed polymer, (3) cooling the selective solvent to precipitate the PET, and (4) removing the selective solvent from the precipitated PET. It is preferable that the mixed polymer recycle stream be prepared for recycling by conventional steps, such as water washing. In a preferred embodiment, the mixed polymer recycle stream is chemically washed subsequent to water washing and prior to contact with the selective solvent. The PET recovered is preferably combined with "virgin" PET and further processed to increase its molecular weight.

摘要翻译： 本文描述的本发明提供了一种用于再循环含有聚酯聚合物，特别是通常为碳酸软饮料或其它容器形式的聚对苯二甲酸乙二醇酯（PET）的混合聚合物再循环料流的方法。 该新方法包括以下步骤：（1）使混合的聚合物再循环流与选择性溶解PET的溶剂接触。 （2）从残留混合聚合物中分离含有选择性溶剂的PET，（3）冷却选择性溶剂使PET沉淀，（4）从析出的PET中除去选择性溶剂。 优选混合聚合物再循环流通过常规步骤如水洗来制备用于再循环。 在优选的实施方案中，混合聚合物再循环料流在水洗后和与选择性溶剂接触之前进行化学洗涤。 回收的PET优选与“原始”PET组合并进一步加工以增加其分子量。