发明授权
- 专利标题: Method for the purification of 4,4'-diamino-diphenylmethane
- 专利标题(中): 4,4'-二氨基 - 二苯基甲烷的纯化方法
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申请号: US68229申请日: 1993-05-28
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公开(公告)号: US5312989A公开(公告)日: 1994-05-17
- 发明人: Takahiro Yamamoto , Hirokazu Murata , Kiichi Hattori
- 申请人: Takahiro Yamamoto , Hirokazu Murata , Kiichi Hattori
- 申请人地址: JPX Osaka
- 专利权人: Sumitomo Chemical Co., Ltd.
- 当前专利权人: Sumitomo Chemical Co., Ltd.
- 当前专利权人地址: JPX Osaka
- 优先权: JPX4-138673 19920529
- 主分类号: C07C209/84
- IPC分类号: C07C209/84 ; C07C211/50
摘要:
A method of purifying 4,4'-diaminodiphenylmethane comprising partially melting a crystal of crude 4,4'-diaminodiphenylmethane and removing a melt to obtain a high purity 4,4'-diaminodiphenylmethane. By utilizing the method, a high purity 4,4'-diaminodiphenylmethane is obtained efficiently with a low level of energy consumption.
公开/授权文献
- US4772217A Pressure sensor connector system 公开/授权日:1988-09-20
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