Process for purifying aqueous distillation residues during the t

Details Process for purifying aqueous distillation residues during the t Process for purifying aqueous distillation residues during the t

1984-08-28

1987-06-09

Bashore, S. Leon

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

Organic compounds

Carbohydrates or derivatives

536 96, 203 47, 203DIG25, 2104332, 210650, 210777, 159 471, C08B 1100, B01D 1300

Patent

active

046721134

ABSTRACT:
Disclosed is a process for the purification treatment of liquid reaction and/or washing media obtained in the preparation of cellulose ethers which comprises distilling and subsequently ultrafiltering the media. In the distilling step, the low-boiling organic by-products of the reaction, the residual, non-reacted, low-boiling organic reaction components and/or the optionally used organic solvents are separated in the form of a distillate. The aqueous distillation residue, which particularly comprises salts, a cellulose constituent and possibly medium and/or high-boiling organic by-products of the reaction and/or non-reacted organic reaction components, is thereafter subjected to ultrafiltration. Ultrafiltration results in a permeate, in which the COD values are, for example, reduced by about 20% by weight.

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