Patent ID: 9587037
Date: 2017-03-07
CPC Classifications: C08B

Claim:
1. A process for recovering an esterified cellulose ether from a reaction product mixture obtained from a reaction of (a) a cellulose ether with (b) a di- or tricarboxylic acid anhydride or a combination of an aliphatic monocarboxylic acid anhydride and a di- or tricarboxylic acid anhydride, wherein the process comprises the steps of (i) contacting the reaction product mixture with an aqueous liquid to precipitate the esterified cellulose ether from the reaction product mixture, (ii) isolating the precipitated esterified cellulose ether from the mixture obtained in step (i), (iii) suspending the isolated esterified cellulose ether in an aqueous liquid to provide a suspension having a temperature of at least 50° C., and (iv) recovering the esterified cellulose ether from the suspension of step (iii).