Purification of cellulose ethers

Details Purification of cellulose ethers Purification of cellulose ethers

1985-03-15

1986-04-08

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

536 87, 536 91, C08B 1120

Patent

active

045814465

ABSTRACT:
Impurities in cellulose ether compositions are removed by providing a functionally effective thickness of a cellulose ether composition to a filtration device, and contacting the thickness, in a manner such that substantial thickness is maintained with at least one extracting solution in which the impurities in the cellulose ether are soluble such that a gradient impurity concentration is formed. High purity cellulose ethers are prepared, without experiencing large product losses.

REFERENCES:
patent: 3448100 (1969-06-01), Callihan et al.
patent: 3453261 (1969-07-01), Scherff
patent: 4229572 (1980-10-01), Zweigle
patent: 4296235 (1981-10-01), Ziche
patent: 4404370 (1983-09-01), Bernert et al.

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