Synchronous Pulping Process of Rice Straw by Cold Soaking and Bleaching

A process method, the technology of rice-wheat-straw, which is applied in the field of synchronous pulping process of rice-wheat-straw cold-soaking and bleaching, can solve the problems that the pulping process cannot obtain easily bleached pulp, the pulping process is too long, and the pulping strength of the pulp is poor. , to achieve the effect of easing the effect, shortening the pulping process, and improving the pulping strength

Inactive Publication Date: 2016-05-25
李文海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They still have considerable technical problems of sewage discharge and environmental pollution, and the pulping process cannot obtain easy-bleaching pulp; in addition, the pulping strength of the pulp obtained is poor, so it can only be used in the production of corrugated paper and bobbin cardboard.
[0004] The existing pulping technology still has technical problems of too long and complicated pulping process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The rice and wheat straw cold-soaking and bleaching synchronous pulping process method: the chemical liquid is filled in the pool, and the weight of the purified rice and wheat straw is immersed in the chemical liquid, and it is cold-soaked at room temperature for 4~ After 6 hours, take it out and wash it, and grind, wash, remove slag, and screen the soaked rice and wheat straw to obtain a slurry. The chemical solution is a mixed solution of caustic soda, sulfonate and hydrogen peroxide dissolved in water. According to the total weight percentage of the mixed solution, the content of caustic soda is 5-10%, the content of sulfonate is 1-2%. 10-12% hydrogen oxide, wherein the amount of water used is 10-12 times the weight of the dry rice straw raw material, and the pH value of the chemical liquid is not less than 12. When the dosage of each medicine is the upper limit, the lower limit is taken for the cold soaking time; otherwise, when the dosage of each medicine is the l...

Embodiment 2

[0013] The rice and wheat straw cold-soaking and bleaching synchronous pulping process method: the chemical liquid is filled in the pool, and the weight of the purified rice and wheat straw is immersed in the chemical liquid, and it is cold-soaked at room temperature for 18~ After 20 hours, it was taken out and cleaned, and the soaked rice and wheat straw were conventionally ground, cleaned, slag-removed and screened to obtain bleached pulp. The chemical solution is a mixed solution of caustic soda, sulfonate and hydrogen peroxide dissolved in water. According to the total weight percentage of the mixed solution, the content of caustic soda is 5-10%, the content of sulfonate is 1-2%. 10-12% hydrogen oxide, wherein the amount of water used is 10-12 times the weight of the dry rice straw raw material, and the pH value of the chemical liquid is not less than 12. When the dosage of each medicine is the upper limit, the lower limit is taken for the cold soaking time; otherwise, whe...

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PUM

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Abstract

The invention provides a pulping process method for synchronously quenching and bleaching rice straws. A pulping method for quenching a rice straw raw material in a room temperature environment for at least four hours by using a mixed chemical liquid medicine prepared by dissolving caustic soda, sulfonate and hydrogen peroxide in water is adopted, wherein the chemical liquid medicine is prepared from the components by total weight percentage of the mixed liquid medicine: 5-10 percent of caustic soda, 1-2 percent of sulfonate, and 10-12 percent of hydrogen peroxide, and the water dose is 10-12 times of the dry weight part. By adopting the technical scheme, the pulping process flow is greatly shortened, the constraint of lignin to fibers can be eliminated in the quenching process, so that the fibers can be sufficiently softened into pulp in the quenching process, and the pulping process is high in yield, high in quality, low in cost and friendly to environment.

Description

technical field [0001] The patent application of the present invention relates to a pulping process method in which gramineous stems are used as pulping raw materials, especially a pulping process method in which rice and wheat straws are used as pulping raw materials. Background technique [0002] Most of the pulp obtained from papermaking pulping is used in papermaking production, but with the development of technology, there are more and more demands for the use of packaging products and filling products. [0003] As of today, the paper and pulp industry is facing three major pressures: environmental protection pressure, pulping raw material shortage pressure and process cost pressure. The existing papermaking pulping process still uses the more traditional chemical pulping method, especially the pulping process using rice straw as raw material, including alkali steam pulping and kraft pulping, in which high alkali consumption is mainly used And high-temperature cooking ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C9/16
Inventor 李文海
Owner 李文海
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