Process for refining wheat-straw pulp by hydrogen peroxide enzyme method

Abstract

The invention relates to a process for refining wheat-straw pulp by a hydrogen peroxide enzyme method. A technology combining biological enzyme cold soaking catalytic decomposition with a mechanical mehtod is adopted for forming paper pulp from wheatgrass, grass is softened and dissociated at normal temperature, and fiber with physical indexes which meet the requirements of a conventional papermaking standard is formed through the mechanical mehtod. The process is as follows: soaking and softening the wheatgrass by adopting sodium hydroxide and sodium sulfite for cold soaking, then extruding a soaking solution in the wheatgrass through a screw extruder, washing, dehydrating, then enabling the wheatgrass to react with disodium edetate, sodium borohydride and hydrogen peroxidase in a thread rolling machine for fibrillation, and further forming the wheat-straw pulp required for production through a medium-concentration grinding machine and a high-concentration grinding machine. According to the process, the following raw materials in percentage by weight are used for the absolute dry wheatgrass: 16%-20% of sodium hydroxide, 0.6%-0.9% of sodium sulfite, 0.5%-2% of disodium edetate, 0.1%-0.3% of sodium borohydride and 0.5%-1.39% of hydrogen peroxidase. According to the process disclosed by the invention, biological bleaching and pulping is adopted, black liquor is not produced, a biological dissolution solution for soaking the wheatgrass can be reused for a long time, pulping water can be reused, and the production and the emission of the black liquor can be avoided during the pulping process.

Description

technical field [0001] The invention belongs to a pulping and papermaking treatment method, and relates to a process for refining wheat straw pulp by a catalase method. Background technique [0002] my country is rich in resources such as rice straw, wheat straw, grain straw, and cotton linters. It is estimated that there are more than 600 million tons of straw by-products of crops in the country every year, and the utilization of all elements of straw by-products of crops has practical significance. The traditional wheat straw strong alkali high temperature pulping process has the problem of black liquor pollution. [0003] In recent years, with the continuous strengthening of environmental protection awareness and requirements and the gradual maturity of biorefining technology, it has become a "popular" trend to use enzyme biocatalysis technology to replace the traditional strong alkali high temperature pulping technology. [0004] Catalase (CAT for short), also known as...

AI Technical Summary

Problems solved by technology

The problem of black liquor pollution in the traditional strong alkali high temperature pulping process of wheat straw

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