公开(公告)号：US4339573A

公开(公告)日：1982-07-13

申请号：US165868

申请日：1980-07-07

申请人： Willi Wust ,  Hasso Leischner ,  Wilfried Rahse ,  Franz-Josef Carduck ,  Norbert Kuhne

发明人： Willi Wust ,  Hasso Leischner ,  Wilfried Rahse ,  Franz-Josef Carduck ,  Norbert Kuhne

IPC分类号： C08B11/02 ,  C08B1/08 ,  C08B1/06 ,  C08B11/193

CPC分类号： C08B1/08

摘要： This invention relates to an improved process for preparing cellulose derivatives by alkalizing cellulose to form alkali cellulose, alkylating the alkali cellulose to form alkylated alkali cellulose, and recovering the alkylated alkali cellulose. According to the process of the invention, finely-divided, preferably powdered, cellulose is reacted with an aqueous-alcoholic alkali metal hydroxide solution at a temperature of from about 20.degree. to 120.degree. C., to form alkali cellulose, oxygen is removed, and the water content is reduced to from about 2.5 to 6.0 moles per anhydroglucose unit, prior to alkylization.

摘要翻译： 本发明涉及通过碱化纤维素来形成碱纤维素，烷基化碱性纤维素以形成烷基化碱纤维素并回收烷基化碱纤维素来制备纤维素衍生物的改进方法。 根据本发明的方法，将微细的，优选粉末状的纤维素与约20-120℃的水性醇碱金属氢氧化物溶液反应，形成碱性纤维素，除去氧气， 并且在烷基化之前将水含量降低至约2.5至6.0摩尔/脱水葡萄糖单元。

公开(公告)号：US4341892A

公开(公告)日：1982-07-27

申请号：US243502

申请日：1981-03-13

申请人： Norbert Kuhne ,  Hasso Leischner ,  Wilfried Rahse ,  Willi Wust

发明人： Norbert Kuhne ,  Hasso Leischner ,  Wilfried Rahse ,  Willi Wust

IPC分类号： C08B1/08

CPC分类号： C08B1/08

摘要： This invention is directed to the preparation of alkali cellulose. More particularly, this invention is directed to a process for the preparation of alkali cellulose having a low water content, wherein finely divided cellulose suspended in a typical inert organic solvent is presteeped and the cellulose suspension is contacted with an alkali metal hydroxide/alcohol mixture and at least one aqueous alkalization solution of different concentration.

摘要翻译： 本发明涉及碱纤维素的制备。 更具体地说，本发明涉及一种制备水含量低的碱纤维素的方法，其中悬浮在典型的惰性有机溶剂中的细碎纤维是预先悬浮的，纤维素悬浮液与碱金属氢氧化物/醇混合物接触， 至少一种不同浓度的碱性水溶液。

公开(公告)号：US4339574A

公开(公告)日：1982-07-13

申请号：US165869

申请日：1980-07-07

申请人： Willi Wust ,  Hasso Leischner ,  Wilfried Rahse ,  Franz-Josef Carduck ,  Norbert Kuhne

发明人： Willi Wust ,  Hasso Leischner ,  Wilfried Rahse ,  Franz-Josef Carduck ,  Norbert Kuhne

IPC分类号： C08B11/02 ,  C08B11/193 ,  C08B17/06 ,  C08B11/08

CPC分类号： C08B17/06 ,  C08B11/02 ,  C08B11/193

摘要： This invention is directed to a method for the continuous production of alkyl cellulose by reacting alkali cellulose with alkylating agents in the presence of inert liquids, wherein:(a) powdered cellulose is reacted with aqueous-alcoholic alkali metal hydroxide solution at temperatures of from about 20.degree. to 80.degree. C. to form alkali cellulose;(b) oxygen is completely removed from the alkali cellulose reaction mixture of step (a) and the water content is reduced to about 2.5 to 6.0 moles per anhydroglucose unit; and(c) the reaction mixture from step (b) is reacted with at least a stoichiometric amount, but not more than with a molar excess of up to about 50%, based on the alkali metal hydroxide, of an alkylating agent in an inert liquid boiling at a temperature of from about 80.degree. to 160.degree. C., the reaction being carried out continuously in stirred tanks-in-series with 2 to 10 units.

摘要翻译： 本发明涉及一种在惰性液体存在下使碱纤维素与烷基化剂反应连续生产烷基纤维素的方法，其中：（a）粉末状纤维素与含水醇碱金属氢氧化物溶液在约 20〜80℃，形成碱纤维素; （b）从步骤（a）的碱纤维素反应混合物中完全除去氧气，并且每个脱水葡萄糖单元的含水量降低至约2.5至6.0摩尔; 和（c）来自步骤（b）的反应混合物与基于碱金属氢氧化物的烷基化剂在惰性物质中的至少化学计量量但不超过摩尔过量至多约50％ 液体在约80℃至160℃的温度下沸腾，反应在2至10单位的串联搅拌釜中连续进行。

公开(公告)号：US4927946A

公开(公告)日：1990-05-22

申请号：US345918

申请日：1989-05-01

申请人： Willi Wuest ,  Rainer Eskuchen ,  Herbert Esser ,  Hasso Leischner

发明人： Willi Wuest ,  Rainer Eskuchen ,  Herbert Esser ,  Hasso Leischner

IPC分类号： C07D319/06

CPC分类号： C07D319/06

摘要： Unpurified 2-bromo-2-nitro-1,3-propanediol is used as the starting material for a process for the preparation of 5-bromo-5-nitro-1,3-dioxane from 2-nitro-1,3-propanediol without the use of an organic solvent on an industrial scale. This is carried out in such a way that in a first stage a mixture of bromine and aqueous hydrogen bromide solution is cooled and an aqueous solution of an alkali metal or an alkaline-earth metal salt of 2-nitro-1,3-propanediol is added at such a rate that, with cooling, the maximum reaction temperature does not exceed 30.degree. C., and then in a second reaction stage paraformaldehyde and sulfuric acid are added, left to react above room temperature, and the organic phase separated.

摘要翻译： 未纯化的2-溴-2-硝基-1,3-丙二醇用作从2-硝基-1,3-丙二醇制备5-溴-5-硝基-1,3-二恶烷的方法的起始原料 而不使用工业规模的有机溶剂。 以这样的方式进行：在第一阶段中，将溴和溴化氢水溶液的混合物冷却，并将2-硝基-1,3-丙二醇的碱金属或碱土金属盐的水溶液为 以这样的速度加入，冷却后最大反应温度不超过30℃，然后在第二反应阶段加入多聚甲醛和硫酸，使其在室温以上反应，分离有机相。