Invention Grant
- Patent Title: Process for recovering an esterified cellulose ether from a reaction product mixture
- Patent Title (中): 从反应产物混合物中回收酯化纤维素醚的方法
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Application No.: US15022418Application Date: 2014-09-15
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Publication No.: US09587037B2Publication Date: 2017-03-07
- Inventor: Oliver Petermann , Matthias Sprehe , Robert Appell , Robert Nilsson
- Applicant: Dow Global Technologies LLC
- Assignee: Dow Global Technologies LLC
- Current Assignee: Dow Global Technologies LLC
- International Application: PCT/US2014/055592 WO 20140915
- International Announcement: WO2015/041973 WO 20150326
- Main IPC: C08B13/00
- IPC: C08B13/00 ; A61K8/28 ; G03C1/835 ; C08B11/20 ; C08B11/22 ; C08B17/00

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 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), and (iii) suspending the isolated esterified cellulose ether in an aqueous liquid to provide a suspension having a temperature of at least 28° C., and (iv) recovering the esterified cellulose ether from the suspension of step (iii).
Public/Granted literature
- US20160222133A1 A PROCESS FOR RECOVERING AN ESTERIFIED CELLULOSE ETHER FROM A REACTION PRODUCT MIXTURE Public/Granted day:2016-08-04
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