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US 5,002,635 AGranted
Method for producing pulp using pre-treatment with stabilizers and refining
AssigneeScott Paper Company
InventorsVictor M. Gentile, Jr., Harry D. Wilder
Life of this patent
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Abstract
A method for producing a novel pulp, primarily wood pulp, from chips using pre-treatment with stabilizers and alkaline peroxide prior to mechanical fiberization (refining) to increase the brightness of the resulting fibers and the papermaking strength achievable with the fibers. The novel aspect of the pretreatment prior to refining is that it reuslts in the "in situ" formation within the chips of a stabilizing flock or sol.
Claims42
A high yield pulping process for lignocellulosic material in chip form comprising:
- (a) impregnating the chips with a first impregnation solution containing stabilizing chemicals for peroxide under conditions of pH, temperature and concentration for the stabilizing chemicals such that they are soluble in the first impregnation solution;
- (b) impregnating the chips containing the first impregnation solution with a second impregnation solution containing stabilizing chemicals for peroxide under conditions of pH, temperature and concentration preselected to provide:
- (i) conditions under which the chemicals in said second impregnation solution are soluble in the second impregnation solution;
- and
- (ii) mixing of the second solution with the first solution within the chips as a result of the second impregnation wherein the mixing results in one or more of the stabilizing chemicals in the combination of the first and second impregnation solutions forming a precipitate or a flock that stabilizes the peroxide within the chips;
- (c) impregnating the chips with a third impregnation solution containing alkaline peroxide;
- and
- (d) mechanically refining the alkaline peroxide impregnated chips to produce pulp.
5 more elements
A high yield pulping process for lignocellulosic material in chip form comprising:
- (a) impregnating the chips with a first impregnation solution containing stabilizing chemicals for peroxide under conditions of pH, temperature and concentration for the stabilizing chemicals such that they are soluble in the first impregnation solution;
- (b) impregnating the chips containing the first impregnation solution with a second impregnation solution containing stabilizing chemicals for peroxide under conditions of pH, temperature and concentration preselected to provide:
- (i) conditions under which the chemicals in said second impregnation solution are soluble in the second impregnation solution, and
- (ii) mixing of the second solution with the first solution within the chips as a result of the second impregnation wherein the mixing results in one or more of the stabilizing chemicals in the combination of the first and second impregnation solutions forming a precipitate or a flock that stabilizes the peroxide within the chips;
- (c) mechanically refining the alkaline peroxide impregnated chips to produce pulp.
2 more elements
Dependencies are inferred from the claim text.