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1. 发明授权

US5223544A Process for the removal of foreign materials from a post-consumer plyethylene terephthalate feed stream 失效
标题翻译：用于从消费后的对苯二甲酸乙二醇酯进料流中除去异物的方法
公开(公告)号：US5223544A
公开(公告)日：1993-06-29
申请号：US860963
申请日：1992-03-31
申请人： Eugene J. Burkett , Randy S. Jenks
发明人： Eugene J. Burkett , Randy S. Jenks
IPC分类号： B09B5/00 , B01J19/24 , B03B5/28 , B03B5/62 , B29B13/02 , B29B17/02 , C08J11/06 , C08J11/10 , C08J11/24
CPC分类号： C08J11/24 , B01J19/24 , B29B13/022 , B29B17/02 , B01J2219/00168 , B01J2219/00171 , B01J2219/00772 , B29B2017/0203 , B29B2017/0244 , B29B2017/0258 , B29K2023/06 , B29K2067/00 , B29K2105/065 , B29L2031/7158 , C08J2367/02 , Y02W30/524 , Y02W30/622 , Y02W30/706
摘要： In today's environment, it is becoming increasingly more important to recycle plastics including polyethylene terephthalate. Technology available today allows for polyethylene terephthalate to be recycled into a wide variety of useful products. For instance, carbonated beverage bottles which are comprised of polyethylene terephthalate can be recycled into new polyethylene terephthalate beverage bottles. However, a relatively pure polyethylene terephthalate post consumer feed stream is required in many such recycling programs. Unfortunately, such feed streams are often contaminated with foreign material. This invention relates to a process for removing foreign materials from a post-consumer polyethylene terephthalate feed stream which comprises: (1) depolymerizing the polyethylene terephthalate feed stream into a melt having a melt viscosity which is within the range of 0.001 poise to 1000 poise, (2) feeding the melt into a separation device, (3) allowing low density foreign materials to float to the surface of the melt, (4) allowing high density foreign materials to sink to the bottom of the melt, and (5) removing molten polyethylene terephthalate oligomer from an area which is located intermediately between the surface of the melt and the bottom of the melt.
摘要翻译：在当今的环境下，回收包括聚对苯二甲酸乙二醇酯在内的塑料变得越来越重要。今天提供的技术可以将聚对苯二甲酸乙二醇酯再循环到各种有用的产品中。例如，由聚对苯二甲酸乙二酯组成的碳酸饮料瓶可以再循环到新的聚对苯二甲酸乙二醇酯饮料瓶中。然而，在许多这样的回收程序中需要相对纯的聚对苯二甲酸乙二醇酯后消费进料流。不幸的是，这种进料流通常被外来物质污染。本发明涉及从消费后聚对苯二甲酸乙二醇酯进料流中除去异物的方法，该方法包括：（1）将聚对苯二甲酸乙二醇酯进料流解聚成熔体粘度在0.001泊至1000泊范围内的熔体中，（2）将熔体输送到分离装置中，（3）允许低密度异物漂浮到熔体的表面，（4）允许高密度异物沉入熔体的底部，和（5）去除熔融的聚对苯二甲酸乙二醇酯低聚物位于熔融物表面之间的区域和熔体的底部之间。

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