Title:
強化された剪断の限外ろ過により、水性溶液からセルロースエーテルを回収するための方法
Document Type and Number:
Japanese Patent JP4375967
Kind Code:
B2
Abstract:
The invention relates to a process for recovering cellulose ethers from aqueous solutions, particularly from the washing media obtained in the purification of crude cellulose ethers. The process comprises the following steps: (a) passing the aqueous solution through an ultrafiltration membrane apparatus creating enhanced shear at the surface of the ultrafiltration membrane at a temperature below the flocculation temperature of the cellulose ether; (b) diluting the retentate obtained in step (a) with a solvent in a volume ratio of solvent to retentate in the range of 1:1 to 40:1; and (c) passing the diluted retentate obtained in step (b) through an ultrafiltration membrane apparatus creating enhanced shear at the surface of the ultrafiltration membrane at a temperature below the flocculation temperature of the cellulose ether. The process of the invention provides a good retention of cellulose ether at high membrane fluxes.
Inventors:
Costas, John N
Application Number:
JP2002567452A
Publication Date:
December 02, 2009
Filing Date:
February 22, 2002
Export Citation:
Assignee:
HERCULES INCORPORATED
International Classes:
B01D61/00; B01D61/14; B01D61/16; B01D61/22; B01D63/16; B01D71/22; B01D71/56; C02F1/44; C08B11/20
Domestic Patent References:
| JP59041303A | ||||
| JP2001029749A |
Foreign References:
| US5360902 | ||||
| DE4134662A1 |
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Hiroaki Noya
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Hiroaki Noya