发明授权
US06667395B2 Process and apparatus for the industrial preparation of methylhydroxyalkylcellulose
有权
用于工业制备甲基羟烷基纤维素的方法和设备
- 专利标题: Process and apparatus for the industrial preparation of methylhydroxyalkylcellulose
- 专利标题(中): 用于工业制备甲基羟烷基纤维素的方法和设备
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申请号: US10241711申请日: 2002-09-11
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公开(公告)号: US06667395B2公开(公告)日: 2003-12-23
- 发明人: Torsten Holtkötter , Stefan Michel , Gerd Sonnenberg
- 申请人: Torsten Holtkötter , Stefan Michel , Gerd Sonnenberg
- 优先权: DE10145408 20010914; DE10234426 20020729
- 主分类号: C08B1100
- IPC分类号: C08B1100
摘要:
A description is given of a process for the industrial preparation of methylhydroxyalkylcelluloses (MHACs) by reaction of cellulose with alkali metal hydroxide and subsequent reaction with an alkyl halide and hydroxyalkylating agent, characterized in that the reaction is carried out batchwise in a reactor which has an L/D ratio of less than 2.5 and in which the unmixed regions are minimized and the batch reactor is preceded at the inlet by a continuously operated cellulose milling facility and is followed at the outlet by a continuously running plant for milling and drying the products, with the product being transported by action of gravity. An apparatus for carrying out this process and the methylhydroxyalkylcellulose obtainable by the process are also described.