公开(公告)号：US20200255547A1

公开(公告)日：2020-08-13

申请号：US16651159

申请日：2018-07-26

Applicant: DOW GLOBAL TECHNOLOGIES LLC

Inventor： Robert Appell ,  Jorg Theuerkauf ,  Matthias S Ober ,  Matthias Knarr

IPC: C08B11/08

Abstract: A process for preparing cellulose ether includes (a) alkylation and etherification of cellulose to form an initial cellulose ether, (b) washing and filtering of the initial cellulose ether; (c) optionally granulating the cellulose ether; (d) compounding the cellulose ether to form a dough; (e) optionally disposing the cellulose ether into a buffer tank; and (f) drying the cellulose ether dough to obtain a final cellulose ether with a lower viscosity than the initial cellulose ether; where the process is characterized by introducing an aqueous catalyst and a peroxy-containing oxidizer to the cellulose ether during at least one of steps (c)-(f), introducing an aqueous enhancer during at least one of steps (c)-(e) and wherein the process is free of drying an isolating cellulose ether after (a) and before drying the final cellulose ether.

公开(公告)号：US09587037B2

公开(公告)日：2017-03-07

申请号：US15022418

申请日：2014-09-15

Applicant: Dow Global Technologies LLC

Inventor： Oliver Petermann ,  Matthias Sprehe ,  Robert Appell ,  Robert Nilsson

IPC: C08B13/00 ,  A61K8/28 ,  G03C1/835 ,  C08B11/20 ,  C08B11/22 ,  C08B17/00

CPC classification number: C08B13/00 ,  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).

Abstract translation: 从（a）纤维素醚与（b）脂肪族一元羧酸酐或二羧酸或三羧酸酐的反应得到的反应产物混合物或脂肪族单羧酸酐的组合中回收酯化纤维素醚的方法 和二羧酸或三羧酸酐包括以下步骤：（i）使反应产物混合物与水性液体接触，以使反应产物混合物中的酯化纤维素醚沉淀，（ii）从得到的混合物中分离沉淀的酯化纤维素醚 在步骤（i）中，和（iii）将分离的酯化纤维素醚悬浮在水性液体中以提供温度至少为28℃的悬浮液，和（iv）从步骤（i）的悬浮液中回收酯化的纤维素醚 iii）。

公开(公告)号：US20160222133A1

公开(公告)日：2016-08-04

申请号：US15022418

申请日：2014-09-15

Applicant: DOW GLOBAL TECHNOLOGIES LLC

Inventor： Oliver Petermann ,  Matthias Sprehe ,  Robert Appell ,  Robert Nilsson

IPC: C08B13/00

CPC classification number: C08B13/00 ,  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).

Abstract translation: 从（a）纤维素醚与（b）脂肪族一元羧酸酐或二羧酸或三羧酸酐的反应得到的反应产物混合物或脂肪族单羧酸酐的组合中回收酯化纤维素醚的方法 和二羧酸或三羧酸酐包括以下步骤：（i）使反应产物混合物与水性液体接触，以使反应产物混合物中的酯化纤维素醚沉淀，（ii）从得到的混合物中分离沉淀的酯化纤维素醚 在步骤（i）中，和（iii）将分离的酯化纤维素醚悬浮在水性液体中以提供温度至少为28℃的悬浮液，和（iv）从步骤（i）的悬浮液中回收酯化的纤维素醚 iii）。