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    • 1. 发明公开
    • EFFICIENT PROCESS FOR PREPARING AN ESTER OF A CELLULOSE ETHER
    • 有效的制备纤维素醚酯的方法
    • EP3212675A1
    • 2017-09-06
    • EP15791421.9
    • 2015-10-21
    • Dow Global Technologies Llc
    • PETERMANN, OliverSPREHE, MatthiasAPPELL, Robert B.
    • C08B13/00C08L1/32A61K47/38C09D101/32
    • C08B13/00C08L1/32C09D101/32
    • A process for producing an esterified cellulose ether can be efficiently be produced by reacting a moist cellulose ether having a water content of at least 10 percent, based on the weight of the moist cellulose ether, with an aliphatic monocarboxylic acid anhydride, a dicarboxylic acid anhydride or a combination thereof. Further improvements in efficiency and reduction in process steps are achieved in a process for producing an esterified cellulose ether which comprises the steps of a) reacting cellulose with an alkaline material to produce alkali cellulose, b) reacting the produced alkali cellulose with one or more etherifying agents and washing the produced cellulose ether to obtain a moist cellulose ether having a water content of at least 10 weight percent, and c) reacting the moist cellulose ether with an aliphatic monocarboxylic acid anhydride and/or a dicarboxylic acid anhydride and with a depolymerizing agent.
    • 生产酯化纤维素醚的方法可以通过使基于湿纤维素醚重量的水含量为至少10%的湿纤维素醚与脂族一元羧酸酐,二元羧酸酐 或其组合。 在生产酯化纤维素醚的方法中实现效率和工艺步骤的进一步改进,其包括以下步骤:a)使纤维素与碱性物质反应以生产碱纤维素,b)使所生产的碱纤维素与一种或多种醚化反应 和洗涤所生产的纤维素醚以获得水含量至少10重量%的湿纤维素醚,和c)使湿纤维素醚与脂族单羧酸酐和/或二羧酸酐和解聚剂 。