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    • 1. 发明申请
    • PROCESS FOR THE PREPARATION OF A STARCH ESTER
    • 制备淀粉酶的方法
    • WO1998029455A1
    • 1998-07-09
    • PCT/FI1997000838
    • 1997-12-31
    • VALTION TEKNILLINEN TUTKIMUSKESKUSLAMMERS, GeertTIITOLA, PerttiVUORENPÄÄ, Jani
    • VALTION TEKNILLINEN TUTKIMUSKESKUS
    • C08B31/04
    • C08B31/04
    • Process for the preparation of a starch ester, in particular a starch acetate, wherein a starch-based feedstock is reacted with an organic carboxylic acid anhydride in the presence of a catalyst. The reaction of the starch-based feedstock and the anhydride is performed at an excess pressure of about 0.1 to 50 bar in an essentially anhydrous medium containing 10 % by weight of water at the most. As catalyst, sodium acetate, sodium hydroxide or sulphuric acid is used, and as the reaction medium, acetic acid or excess acetanhydride is used. By means of the invention, the duration of the esterification reaction can be significantly shortened, the separation of the product can be facilitated, and the recirculation of the waste solutions can be rendered more efficient.
    • 用于制备淀粉酯,特别是淀粉乙酸酯的方法,其中淀粉基原料与催化剂存在下与有机羧酸酐反应。 基于淀粉的原料和酸酐的反应在约0.1至50巴的过量压力下,在最多含有10重量%水的基本上无水的介质中进行。 作为催化剂,使用乙酸钠,氢氧化钠或硫酸,作为反应介质,使用乙酸或过量的乙酸酐。 通过本发明,可以显着缩短酯化反应的持续时间,可以促进产物的分离,并且可以使废液的再循环更有效率。