发明名称 |
SÄUBERUNG VON POLYETHYLENE TEREPHTHALATEN |
摘要 |
<p>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.</p> |
申请公布号 |
AT182578(T) |
申请公布日期 |
1999.08.15 |
申请号 |
AT19930911683T |
申请日期 |
1993.05.04 |
申请人 |
SWIG PTY. LTD. |
发明人 |
WEST, SIMON, MICHAEL |
分类号 |
C08J11/10;C07C67/03;C08G63/12;C08G63/88;C08J11/06;(IPC1-7):C07C69/82;C07C63/26 |
主分类号 |
C08J11/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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