发明授权
- 专利标题: Method for making aromatic bis(ether dicarboxylic acid)s
- 专利标题(中): 制备芳族双(醚二羧酸)的方法
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申请号: US590877申请日: 1975-06-27
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公开(公告)号: US4054600A公开(公告)日: 1977-10-18
- 发明人: Donald S. Johnson
- 申请人: Donald S. Johnson
- 申请人地址: NY Schenectady
- 专利权人: General Electric Company
- 当前专利权人: General Electric Company
- 当前专利权人地址: NY Schenectady
- 主分类号: C07C51/06
- IPC分类号: C07C51/06
摘要:
A method is provided for making aromatic bis(ether dicarboxylic acid)s, such as 2,2-bis[4(3,4-dicarboxyphenoxy)phenyl] propane. The corresponding aromatic bis(etherimide) is hydrolyzed in base to produce a tetraacid salt which is directly acidified with concentrated mineral acid such as sulfuric acid. The resulting aqueous mixture containing a paste is heated to produce the aromatic bis(ether dicarboxylic acid) in ready filterable form.