水酸化ナトリウムの回収を含む、水溶性セルロースエーテルの製造方法

Japanese Patent JP4192214

B2

Cellulose ethers which contain hydroxyalkyl groups are prepared, with the recovery of sodium hydroxide, by cellulose being etherified with alkylene oxide in a water-containing organic suspension medium in the presence of at least 1.0 mol of sodium hydroxide per mole of anhydroglucose units, the water-containing organic suspension medium being separated off after the etherification reaction is complete, the crude cellulose ether being extracted with a suitable solvent mixture, the lower-boiling organic components being distilled off from the solvent mixture after the extraction, the water-containing organic suspension medium separated off being added to the distillation residue of the solvent mixture to form a multiphase mixture, the bottom phase of the multiphase mixture being separated and the sodium hydroxide present in the bottom phase being reused.

WO/2019/034627	METHYL-ETHYL-HYDROXYALKYL-CELLULOSE AND ITS USE IN BUILDING COMPOSITIONS
JP5226677	How to reduce the average molecular weight of cellulose ether
JP3522002	PRODUCTION OF CELLULOSE ETHER LOW IN DEGREE OF POLYMERIZATION

Reinhard Denges
Rudolf Eller

JP22519197A

December 10, 2008

August 21, 1997

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Clariant Produkte (Deutschland) Gesellschaft Mito Beschlenktel Haftung

C08B11/02; C08B11/08; C08B11/20

JP58196202A
JP6199902A

GB1177317A
DE1177127B

Mitsufumi Esaki
Tsuneo Mihara
Okumura Yoshimichi

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