Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1994-06-13
1996-01-09
Fortuna, Ana M.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210653, 210654, 210650, 210781, 536127, 536128, B01D 6100
Patent
active
054826349
ABSTRACT:
In a process for purifying an aqueous liquid reaction and/or washing medium containing i) hot water-insoluble cellulose ethers and ii) hot water-soluble cellulose ethers and/or macromolecular cellulose ether by-products, in a purification step a) the aqueous medium has a temperature above the gel point of the hot water-insoluble cellulose ether and gelled cellulose ether is separated from the aqueous medium by means of a solid-bowl centrifuge or a plate separator and in a purification step b) the remaining aqueous liquor is treated by ultrafiltration at a concentration ratio of at least 40.
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Goerlach-Doht Yvonne M.
Haagensen Ulf H.
Hermanns Juergen
Schneider Hans P.
Fortuna Ana M.
The Dow Chemical Company
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