公开(公告)号：US20210115161A1

公开(公告)日：2021-04-22

申请号：US16493770

申请日：2018-03-14

Applicant: DOW GLOBAL TECHNOLOGIES LLC

Inventor： Oliver O. Petermann ,  Robert L Louis Schmitt ,  Rene Kelling ,  Matthias Sprehe

IPC: C08B13/00

Abstract: A process for recovering an esterified cellulose ether from a reaction product mixture obtained from a reaction of (a) a cellulose ether with (b) an aliphatic monocarboxylic acid anhydride or a di- or tricarboxylic acid anhydride or a combination of an aliphatic monocarboxylic acid anhydride and a di- or tricarboxylic acid anhydride, comprises the steps of (i) contacting the reaction product mixture with an aqueous liquid and precipitating the esterified cellulose ether from the reaction product mixture, and (ii) isolating the precipitated esterified cellulose ether from the mixture obtained in step (i), Tackiness of the esterified cellulose ether can be reduced when before or in step (i) a particulate silicon oxide or metal oxide is dispersed or suspended in the reaction product mixture, the aqueous liquid or a combination thereof.