发明公开
- 专利标题： IMPROVED POLY ETHYLENE TEREPHTHALATE DECONTAMINATION.
- 专利标题（中）： 清洁聚乙烯对苯二甲酸酯。
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申请号： EP93911683申请日： 1993-05-04
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公开(公告)号： EP0641366A4公开(公告)日： 1995-05-31
- 发明人: WEST SIMON MICHAEL
- 申请人： PETWEST PTY LTD
- 专利权人： PETWEST PTY LTD
- 当前专利权人： PETWEST PTY LTD
- 优先权： AUPL247092 1992-05-18; AUPL695193 1993-01-27
- 主分类号： C08J11/10
- IPC分类号： C08J11/10 ; C07C67/03 ; C08G63/12 ; C08G63/88 ; C08J11/06 ; C08J11/00 ; C08J11/02
摘要：
A process for removing contaminants from PET components by depolymerising poly ethylene terephthalate ('PET') comprising transesterifying material containing PET by reacting ethanediol having a temperature at or about the boiling point of ethanediol with the material for a predetermined period of time to form a solution containing soluble short chain PET polymers and/or bis (hydroxy ethyl) terephthalate ester ('BHT'); recovering short chain PET polymers and/or BHT and ethanediol; and hydrolysing the recovered short chain PET polymers and/or BHT at elevated pressure and temperature for a predetermined period of time to form an ethanediol solution and crystals of terephthalic acid.
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