基本信息:
- 专利标题： 羟丙基甲基纤维素的生产方法
- 申请号：CN201810245357.4 申请日：2018-03-23
- 公开(公告)号：CN108623697A 公开(公告)日：2018-10-09
- 发明人： 北村彰 , 吉田光弘
- 申请人： 信越化学工业株式会社
- 申请人地址： 日本国东京都
- 专利权人： 信越化学工业株式会社
- 当前专利权人： 信越化学工业株式会社
- 当前专利权人地址： 日本国东京都
- 代理机构： 北京市隆安律师事务所
- 代理人： 权鲜枝
- 优先权： 2017-057686 2017.03.23 JP
- 主分类号： C08B11/08
- IPC分类号： C08B11/08 ; C08B1/08 ; C08B11/20
Provided is a method for producing hydroxypropyl methyl cellulose (HPMC) having high hydroxypropoxy content, low ash content, and low insoluble fiber content. More specifically, provided is a method for producing HPMC having a methoxy degree of substitution of from 1.4 to 2.2 and a hydroxypropoxy molar substitution of from 0.5 to 1.0, including steps of: bringing sheet-like or chip-like pulp into contact with an alkali metal hydroxide solution to obtain a reaction product mixture containing alkali cellulose, removing a liquid portion from the reaction product mixture to obtain the alkali cellulose, reacting the alkali cellulose with an etherifying agent to obtain a crude HPMC, disintegrating the crude HPMC into a disintegrated crude HPMC, dispersing the disintegrated crude HPMC in water to obtain a slurry, filtering the slurry to obtain a cake, and washing the cake.
公开/授权文献:
- CN108623697B 羟丙基甲基纤维素的生产方法 公开/授权日：2021-10-08