Methods for preparing alkali cellulose and cellulose ether
    2.
    发明公开
    Methods for preparing alkali cellulose and cellulose ether 有权
    制备碱纤维素和纤维素醚的方法

    公开(公告)号:EP1803735A1

    公开(公告)日:2007-07-04

    申请号:EP06026867.9

    申请日:2006-12-23

    IPC分类号: C08B1/08 C08B1/10

    摘要: Provided is a method for efficiently preparing alkali cellulose having a uniform alkali distribution therein. More specifically, provided are a method for preparing alkali cellulose comprising steps of bringing pulp into continuous contact with an alkali metal hydroxide solution in a bucket conveyor type contactor to generate a contact mixture, and draining the contact mixture; a method for preparing a cellulose ether comprising use of the alkali cellulose thus prepared; and an apparatus for preparing alkali cellulose comprising a bucket conveyor contactor comprising at least one inlet port for introducing pulp and an alkali metal hydroxide solution at one end and at least one outlet port for discharging a contact mixture wherein the pulp and the alkali metal hydroxide solution can be moved from one end to the other end while bringing them into contact with each other to generate the contact mixture; and a drainer for separating a cake from the contact mixture discharged from the outlet port.

    摘要翻译: 本发明提供有效地制备其中具有均匀碱分布的碱纤维素的方法。 更具体而言,提供了一种制备碱纤维素的方法,包括以下步骤:使纸浆与斗式输送机型接触器中的碱金属氢氧化物溶液连续接触以产生接触混合物,并排出接触混合物; 一种制备纤维素醚的方法,包括使用如此制备的碱纤维素; 以及一种用于制备碱纤维素的装置,该装置包括斗式输送机接触器,该接触器包括至少一个用于在一端引入纸浆和碱金属氢氧化物溶液的入口和至少一个用于排出接触混合物的出口,其中纸浆和碱金属氢氧化物溶液 可以从一端移动到另一端,同时使它们彼此接触以产生接触混合物; 以及用于从出口排出的接触混合物中分离滤饼的排水器。

    PROCESS FOR IMPROVED PRODUCTION OF ALKALI CELLULOSE AND CELLULOSE DERIVATIVES
    8.
    发明公开
    PROCESS FOR IMPROVED PRODUCTION OF ALKALI CELLULOSE AND CELLULOSE DERIVATIVES 有权
    VERFAHREN ZUR VERBESSERTEN HELLTELLUNG VON ALKELLICULOSE UND CELLULOSEDERIVATEN

    公开(公告)号:EP2403881A1

    公开(公告)日:2012-01-11

    申请号:EP10701267.6

    申请日:2010-01-08

    IPC分类号: C08B1/10 C08B11/193 B01F7/00

    摘要: The present invention relates to a process for the production of alkali cellulose for the production of alkali cellulose and, optionally, cellulose ethers from cellulose in the presence of alkali and, if applicable, with alkylating and/or hydroxyalkylating agent(s) comprising the reaction of a cellulose with an alkali metal hydroxide, wherein the alkali metal hydroxide is mixed with cellulose in a mixing apparatus, the mixing apparatus (1) having an upper region (20, 102a, 202a) with a first cross-section and a lower region (21, 102b, 202b) with a second cross-section, the second cross-section being the same as or smaller than the first cross-section and comprising at least one non-horizontally oriented mixing device (23, 27, 121, 221, 224).

    摘要翻译: 本发明涉及一种生产碱纤维素的方法,用于生产碱纤维素和任选的纤维素醚,所述纤维素由纤维素在碱的存在下和如果适用的情况下与含有反应的烷基化和/或羟烷基化剂 具有碱金属氢氧化物的纤维素,其中所述碱金属氢氧化物与混合装置中的纤维素混合,所述混合装置(1)具有具有第一横截面的上部区域(20,102a,202a)和下部区域 (21,102b,202b),其具有第二横截面,所述第二横截面与所述第一横截面相同或小于所述第一横截面,并且包括至少一个非水平取向的混合装置(23,27,121,221 ,224)。