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1. 发明专利

DE50100747D1 未知
公开(公告)号：DE50100747D1
公开(公告)日：2003-11-13
申请号：DE50100747
申请日：2001-07-30
申请人： WOLFF WALSRODE AG
发明人： DANNHORN DR , SCHLESIGER DR , PANNEK DR , WEISSBACH GEROLF
IPC分类号： C08B11/08 , C08B11/193
摘要： Production of alkylhydroxyalkyl cellulose by the reaction of cellulose with alkyl halides in the presence of alkali and at least one alkylene oxide, is new. A process for the production of alkylhydroxyalkyl cellulose by the reaction of cellulose in the presence of alkali with alkyl halides and at least one alkylene oxide comprises: (a) mixing cellulose with 1.5-5.5 equivalents of alkali hydroxide per AGU (anhydroglucose unit) as an aqueous solution in the presence of a suspension agent which contains an amount of alkyl halide ranging from equivalents alkali hydroxide per AGU of -1.4 to +0.8 (b) reaction of the alkali treated cellulose with alkylene oxide at above 65 degrees C (c) additional dosing of alkyl halide in an amount of at least the difference between the amount of alkyl halide per AGU already added and the amount of alkyl halide per AGU to be added whereby this amount is at least 0.2 equivalents per AGU and (d) isolating the resulting alkalihydroxyalkylcellulose from the reaction mixture and optional purification.

2. 发明专利

DE50105744D1 未知
公开(公告)号：DE50105744D1
公开(公告)日：2005-05-04
申请号：DE50105744
申请日：2001-02-16
申请人： WOLFF WALSRODE AG
发明人： SCHLESIGER DR , MORNING DR , WEBER DR , ECKHARDT DR , SONNENBERG GERD , KIESEWETTER DR
IPC分类号： C08B15/00 , A23L29/262 , C08B11/20 , C08B15/02 , C08J3/12
摘要： The present invention relates to a new, particularly economical process for preparing particulate water-soluble cellulose derivatives. The process involves forming a feed composition of swollen and/or dissolved cellulose derivative, and water. The feed composition is contacted with a superheated gas mixture, in a sieve-free high rotational speed gas jet impact mill, and the cellulose derivative of the feed composition is converted into a solid state form of finely particulate particles. The superheated gas mixture, with which the feed composition is contacted, is selected from: (i) a superheated gaseous mixture of steam and an inert gas; and (ii) a superheated gas mixture of steam and air. The superheated gas mixture has a steam content of 40 wt. % to 99 wt. %, based on the total weight of the superheated gas mixture.

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