发明授权
- 专利标题: Process for the isolation of 2-naphthylamine-1,5-disulphonic acid
- 专利标题(中): 2-萘磺酰胺-1,5-二磺酸的分离方法
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申请号: US939194申请日: 1992-09-02
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公开(公告)号: US5248812A公开(公告)日: 1993-09-28
- 发明人: Horst Behre , Heinz-Ulrich Blank , Holger Heidenreich , Fritz Pohl , Paul Uhrhan
- 申请人: Horst Behre , Heinz-Ulrich Blank , Holger Heidenreich , Fritz Pohl , Paul Uhrhan
- 申请人地址: DEX Leverkusen
- 专利权人: Bayer Aktiengesellschaft
- 当前专利权人: Bayer Aktiengesellschaft
- 当前专利权人地址: DEX Leverkusen
- 优先权: DEX4130333 19910912
- 主分类号: C07C303/44
- IPC分类号: C07C303/44 ; C07C309/47
摘要:
When 2-naphthylamine-1,5-disulphonic acid is precipitated from the as-sulphonated reaction mixtures by dilution, a purer product is obtained, with a low level of adherent sulphuric acid, if the precipitation by dilution of the reaction mixture is carried out under precisely defined conditions.
公开/授权文献
- US6125170A Telephone message printing method and apparatus 公开/授权日:2000-09-26
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