Removal of undesirable material from water-soluble polysaccharide ethers
First Claim
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1. A method of removing color bodies from a water-soluble polysaccharide ether containing such color bodies comprising:
- (a) contacting an aqueous solution which comprises a water-soluble polysaccharide ether containing color bodies, with an anion exchange resin in an amount and at conditions effective to associate the color bodies with the resin; and
(b) separating the resin from the polysaccharide ether so as to result in the polysaccharide ether having a reduced concentration of color bodies;
wherein the water-soluble polysaccharide ether is in the aqueous solution in a concentration greater than about 1 weight percent.
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Abstract
A method of removing undesirable material from water-soluble polysaccharide ethers, such as water-soluble cellulose ethers, via contact of an aqueous solution of the water-soluble polysaccharide ether with an anion exchange resin. Anion exchange resins that are useful in the invention are derived from epoxy resin polymers, acrylic based copolymers or a copolymer of styrene-divinylbenzene. The method significantly reduces the amount of colored bodies in the polysaccharide ether.
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17 Claims
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1. A method of removing color bodies from a water-soluble polysaccharide ether containing such color bodies comprising:
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(a) contacting an aqueous solution which comprises a water-soluble polysaccharide ether containing color bodies, with an anion exchange resin in an amount and at conditions effective to associate the color bodies with the resin; and (b) separating the resin from the polysaccharide ether so as to result in the polysaccharide ether having a reduced concentration of color bodies; wherein the water-soluble polysaccharide ether is in the aqueous solution in a concentration greater than about 1 weight percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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