发明授权
US5047560A Process for producing highly pure 3,3',4,4'-biphenyltetracarboxylic acid
or dianhydride thereof
失效
制备高纯度3,3',4,4'-联苯四羧酸或其二酐的方法
- 专利标题: Process for producing highly pure 3,3',4,4'-biphenyltetracarboxylic acid or dianhydride thereof
- 专利标题(中): 制备高纯度3,3',4,4'-联苯四羧酸或其二酐的方法
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申请号: US490917申请日: 1990-03-09
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公开(公告)号: US5047560A公开(公告)日: 1991-09-10
- 发明人: Fusaji Shoji , Nobuo Aoki , Jun Kurita , Tsuyoshi Aoyama , Toshiyuki Kiriyu , Yoshinori Matsuzaki
- 申请人: Fusaji Shoji , Nobuo Aoki , Jun Kurita , Tsuyoshi Aoyama , Toshiyuki Kiriyu , Yoshinori Matsuzaki
- 申请人地址: JPX Tokyo JPX Tokyo JPX Tokyo
- 专利权人: Hitachi, Ltd.,Japan Carlit Co., Ltd.,Kanto Koatsu
- 当前专利权人: Hitachi, Ltd.,Japan Carlit Co., Ltd.,Kanto Koatsu
- 当前专利权人地址: JPX Tokyo JPX Tokyo JPX Tokyo
- 优先权: JPX1-260026 19891006
- 主分类号: C07D307/89
- IPC分类号: C07D307/89 ; C07C51/083 ; C07C51/087 ; C07C51/47 ; C07C51/487 ; C07C51/573 ; C07C63/331
摘要:
Highly pure 3,3',4,4'-biphenyltetracarboxylic acid (BPTA) and dianhydride thereof (BPDA) are produced by heating crude BPTA to give BPDA, treating the BPDA with hot water to give highly pure BPTA, and in the case of highly pure BPDA, heat treating the pure BPTA to give highly pure BPDA.
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