Kraft wood fibers for carboxymethyl cellulose
First Claim
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1. A method for producing an absorbent carboxyalkyl polysaccharide composition comprising (a) prehydrolyzing hardwood chips with water;
- (b) kraft cooking the prehydrolyzed hardwood chips to reduce the hardwood chips to fibers;
(c) bleaching the cooked hardwood fibers;
(d) treating the bleached hardwood fibers with caustic to form a treated hardwood fiber pulp having an alpha-cellulose content greater than 97% and a viscosity greater than 30 centipoise; and
(e) converting the treated hardwood fiber pulp to a carboxyalkyl polysaccharide having an AUL of about 20 or greater.
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Abstract
Disclosed is a method for producing kraft wood fiber having an alpha-cellulose content greater than 97% and a viscosity greater than 40 centipoise. The method involves prehydrolyzing hardwood chips with water, kraft cooking, bleaching and caustic treatment. The resulting pulp can be converted to carboxymethyl cellulose superabsorbents having improved properties, particularly a high “absorbency under load”.
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9 Claims
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1. A method for producing an absorbent carboxyalkyl polysaccharide composition comprising (a) prehydrolyzing hardwood chips with water;
- (b) kraft cooking the prehydrolyzed hardwood chips to reduce the hardwood chips to fibers;
(c) bleaching the cooked hardwood fibers;
(d) treating the bleached hardwood fibers with caustic to form a treated hardwood fiber pulp having an alpha-cellulose content greater than 97% and a viscosity greater than 30 centipoise; and
(e) converting the treated hardwood fiber pulp to a carboxyalkyl polysaccharide having an AUL of about 20 or greater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- (b) kraft cooking the prehydrolyzed hardwood chips to reduce the hardwood chips to fibers;
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