Pulping process method for synchronously quenching and bleaching rice straws

A process method and technology for rice and wheat straw, which are applied to the field of synchronous pulping technology with cold soaking and bleaching of rice and wheat straw, can solve the problems of not getting easy-bleaching pulp in the pulping process, too long the pulping process flow, and poor pulping strength of the pulp. , to achieve the effect of softening the effect, shortening the pulping process, and improving the pulping strength.

Inactive Publication Date: 2014-03-05
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 obta

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0010] Example 1

[0011] The process of cold soaking and bleaching synchronous pulping of rice and wheat straw: The chemical liquid is filled in the pool, and the weight is recorded in multiples of the absolute dry weight. One part by weight of the purified rice and wheat straw is immersed in the chemical liquid, and cold soaked in a room temperature environment for 4~ After 6 hours, it was taken out and washed, and the soaked rice straw was subjected to conventional grinding, washing, deslagging, and screening to prepare slurry. The chemical liquid is a mixed liquid of caustic soda, sulfonate and hydrogen peroxide dissolved in water. Based on the total weight percentage of the mixed liquid, caustic soda is 5-10%, sulfonate is 1-2%, Hydrogen oxide is 10-12%, and the amount of water is 10-12 times the weight of the raw rice straw, and the pH value of the chemical liquid is not less than 12. When the dosage of each drug is the upper limit, the cold soaking time takes the lower li...

Example Embodiment

[0012] Example 2

[0013] The process of cold soaking and bleaching synchronous pulping of rice and wheat straw: The chemical liquid is filled in the pool, and the weight is recorded as a multiple of the absolute dry weight. One part by weight of the purified rice and wheat straw is immersed in the chemical liquid, and cold soaked in a room temperature environment for 18~ After 20 hours, it was taken out and cleaned, and the soaked rice straw was subjected to conventional grinding, cleaning, deslagging and screening to prepare a bleached slurry. The chemical liquid is a mixed liquid of caustic soda, sulfonate and hydrogen peroxide dissolved in water. Based on the total weight percentage of the mixed liquid, caustic soda is 5-10%, sulfonate is 1-2%, Hydrogen oxide is 10-12%, and the amount of water is 10-12 times the weight of the raw rice straw, and the pH value of the chemical liquid is not less than 12. When the dosage of each drug is the upper limit, the cold soaking time tak...

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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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IPC IPC(8): D21C3/02D21C9/16
Inventor 李文海
Owner 李文海
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