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1.发明授权Process including glycolysis and subsequent purification for recycling polyester materials 失效方法包括糖酵解和随后的纯化用于回收聚酯材料
公开(公告)号：US5635584A
公开(公告)日：1997-06-03
申请号：US570177
申请日：1995-12-07
CPC分类号： C08J11/24 , C08G63/78 , C08J2367/02 , Y02W30/706
摘要： A new process is described for recycling polyesters. In accordance with the described process, postconsumer or scrap polyester is reacted with glycol to produce a monomer or low molecular weight oligomer by depolymerization of the polyester. The monomer or oligomer, as the case may be, is then purified using one or more of a number of steps including filtration, crystallization, and optionally adsorbent treatment or evaporation. The monomer or oligomer thus produced is particularly suitable as a raw material for acid or ester based polyester production of packaging grade polyester material. Because the process includes purification steps, specifications for the previously used polyester material need not be strict.
摘要翻译： 描述了一种用于回收聚酯的新工艺。 按照所描述的方法，后聚合物或废聚酯与二醇反应以通过聚酯的解聚产生单体或低分子量低聚物。 然后根据具体情况可以使用一个或多个步骤纯化单体或低聚物，包括过滤，结晶和任选的吸附剂处理或蒸发。 这样制备的单体或低聚物特别适用于包装级聚酯材料的酸或酯基聚酯生产的原料。 因为该方法包括纯化步骤，因此以前使用的聚酯材料的规格不必严格。
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2.发明授权Leaching contaminants from post-consumer for reuse in food-contact applications 失效从消费者身上浸出污染物，以便在食品接触应用中重新使用
公开(公告)号：US5780520A
公开(公告)日：1998-07-14
申请号：US772236
申请日：1996-12-23
CPC分类号： C08J11/08 , B01D11/0288 , C08J2367/02 , Y02W30/701
摘要： A novel technique to treat post-consumer polyester for reuse in food-contact applications is described. The process comprises contacting contaminated post consumer polyester flake with at least one extraction solvent which is soluble in said contaminated flake at a temperature sufficient to allow rapid diffusion of contaminants from said polyester flake; and removing said extraction solvent containing said contaminants from said polyester flake.
摘要翻译： 描述了一种将消费后聚酯用于食品接触应用中的再利用的新技术。 该方法包括使受污染的消费后的聚酯薄片与至少一种可溶于所述污染的薄片的提取溶剂接触，所述提取溶剂的温度足以允许来自所述聚酯薄片的污染物的快速扩散; 并从所述聚酯薄片中除去含有所述污染物的所述提取溶剂。
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