Process for preparing cellulose ethers with recovery of alkali

Details Process for preparing cellulose ethers with recovery of alkali Process for preparing cellulose ethers with recovery of alkali

1997-08-20

1998-11-24

Kunz, Gary L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536 85, 536124, C07H 100, C07H 1508

Patent

active

058408827

ABSTRACT:
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.

REFERENCES:
patent: 4508895 (1985-04-01), Balser

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