Process for producing methyl hydroxyalkyl cellulose ethers

Details Process for producing methyl hydroxyalkyl cellulose ethers Process for producing methyl hydroxyalkyl cellulose ethers

1992-12-15

1994-11-01

Kight, III, John

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

Organic compounds

Carbohydrates or derivatives

536 85, 536 91, 210650, 210651, C02F 144, C08B 1108, C08B 1120, C08B 1122

Patent

active

053609026

ABSTRACT:
The present invention relates to a process for producing methyl hydroxyalkyl cellulose ethers by alkalisation and etherification of celluloses, rinsing the methyl hydroxyalkyl cellulose ethers with water at higher temperatures and recovering the short-chain cellulose ethers that are soluble in the wash water, wherein the wash water containing sodium chloride and organic by-products is passed across a first stage of a membrane filtration having a molecular cut size of 200 to 150,000 Dalton, is concentrated during this process and passes across a second stage of a membrane filtration.

REFERENCES:
patent: 4672113 (1987-06-01), Wallisch et al.
patent: 5218107 (1993-06-01), Schulz
Klinkowski "Ultrafiltration" Encyclopedia of Polymer Science and Engineering vol. 17, pp. 75-107, John Wiley & Sons, USA (1989).

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