发明授权
- 专利标题： Process for preparation of water soluble dyes containing lithium sulfonate group or ammonium sulfonate group by cation exchange, neutralization and reverse osmosis
- 专利标题（中）： 通过阳离子交换，中和和反渗透制备含有磺酸钠基或磺酸铵基团的水溶性染料的方法
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申请号： US908023申请日： 1986-09-15
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公开(公告)号： US4808192A公开(公告)日： 1989-02-28
- 发明人: Yoshihiro Narita , Hiroshi Takimoto , Hideo Sano
- 申请人： Yoshihiro Narita , Hiroshi Takimoto , Hideo Sano
- 申请人地址： JPX Tokyo
- 专利权人： Mitsubishi Chemical Industries Limited
- 当前专利权人： Mitsubishi Chemical Industries Limited
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX60-204921 19850917
- 主分类号： C09B67/54
- IPC分类号： C09B67/54 ; C09B69/02
摘要：
In accordance with this invention an aqueous solution of a water-soluble dye containing lithium sulfonate group or ammonium sulfonate group can be obtained by a very simple and economical process in such a way that an aqueous solution of a water-soluble dye containing sodium sulfonate group is fed to a packed column packed with acid type cation exchange resin (H-form) to form an aqueous solution of a dye containing a free sulfonic acid group, and after neutralizing the resulting solution with LiOH or NH.sub.4 OH, the aqueous solution of the dye thus obtained is concentrated according to a process for separation through reverse osmotic membrane.
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