Production method for preparing chemimechanical pulp by synergy of biological enzyme and alkali

Abstract

The invention provides a production method for preparing chemimechanical pulp through synergy of a biological enzyme and an alkali. The production method specifically comprises the steps of raw material pretreatment, biological enzyme treatment, primary extrusion defibering, secondary extrusion defibering, liquid medicine dipping, and bleaching. Wastewater generated by the process is adopted for pretreatment of wood chips, biological enzyme treatment is combined, so that residual chemicals are fully utilized, the wastewater discharge is reduced, the consumption of sodium hydroxide and peroxides in the subsequent bleaching process is greatly reduced, and the method has dual significance of environmental protection and reality. The chemimechanical pulp prepared by the production process is good in pulping quality, pulp ISO whiteness reaches 82.97-85.36, pulp tearing index reaches 4.24-4.35 N.mm < 2 > / g, tensile strength reaches 27.8-29.1 N.m / g, and pulp fibers are firmly combined.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and in particular relates to a production method for synergistically preparing chemical mechanical pulp with biological enzymes and alkalis. Background technique [0002] With the rapid development of my country's papermaking industry and the rapid growth of total paper output, the insufficient supply of papermaking raw materials has become an important factor restricting the development of my country's papermaking industry. With the further growth of our country's economy and the continuous improvement of people's living standards, people's demand for paper products is also increasing. Only relying on high-quality wood raw materials is far from being able to meet market demand. [0003] Chemical-mechanical pulp has the advantages of high bulk and good stiffness. At the same time, its high fiber content makes it have unique properties, making chemical-mechanical pulp more and more widely us...

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Problems solved by technology

[0004] CN108374292A provides a production process for preparing chemical-mechanical pulp by using a special-effect compound biological enzyme preparation. The special biological enzyme preparation is composed of glutamic acid dehydrogenase, citric acid synthase, Bacillus subtilis freeze-dried powder, Acetobacter freeze-dried powder , organic acid nutrient solution and water, and biological enzymes are added twice when wood chips are rubbed, but the enzymatic hydrolysis reaction temperature reaches about 80°C, the temperature of the chemical-mechanical pulping system is relatively high, and with the stirring and shearing process, biological Enzyme utilization efficiency is not high, pulping resistance is large and energy consumption is high

[0005] CN105155322A provides a method for producing uncolored household paper by bio-enzyme pretreatment + alkaline rice straw pulping, which firstly performs bio-enzyme pretreatment on rice straw raw materials, and then adds an alkali amount lower than ordinary cooking to make pulp, but for specific The bio-enzyme composition of the pulp has not been disclosed. The enzymatic treatment time at 50°C is as long as 50 hours, and the amount of alkali used for cooking is 8%. Bleaching treatment will inevitably reduce the amount of alkali used, but the strength of the prepared pulp is low and the paper is brittle

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