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Method for preparing corrugated paper pulp through sulfur trioxide micro-thermal explosion treatment of straw

A technology of sulfur trioxide and micro-heat explosion, which is applied in pulp beating/refining methods, fiber raw material treatment, cellulose raw material pulping, etc., can solve the problems of low investment and high efficiency, and achieve low investment, high efficiency, and equipment simple effect

Pending Publication Date: 2020-10-16
王剑
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention uses atmospheric pressure micro-thermal explosion technology to process straw, which solves the problem of using high-temperature and high-pressure equipment in the pulping process of the papermaking industry. Simple requirements, low investment and high efficiency, which is conducive to the sustainable development of paper pulping and biochemical industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Chop the corn stalks to 2-5 cm, and sieve to remove dust. Take 10 kg of chopped clean corn stalks and put them into a 60-liter micro-heat explosion reactor, feed sulfur trioxide gas at room temperature until the pressure in the reactor is ≤0.08Mpa, and keep warm for 10 minutes; after the micro-heat explosion reaction, the acidic The straw is transferred to the washing and neutralizing equipment, and the acidic straw is washed and neutralized with 0.5mol / L sodium hydroxide dilute lye and hot water respectively. The washing and neutralizing process is kept at about 45°C, and the pH of the neutralizing solution is controlled 6~7. Press filtration to obtain 12.5 kg of lignocellulose solids (6.5 kg in dry weight); add 3 times the weight of water to the straw solids, stir evenly, and refine the pulp with a refiner to obtain corrugated paper pulp.

Embodiment 2

[0029] Chop the rice straw to 2-5 cm, and sieve to remove dust. Take 10 kg of chopped clean rice straw and put it into a 60-liter micro-heat explosion reactor, feed sulfur trioxide gas at room temperature until the pressure in the reactor is ≤0.02Mpa, and keep warm for 60 minutes; after the micro-heat explosion reaction, the acidic The straw is transferred to the washing and neutralizing equipment, and the acidic straw is washed and neutralized with 0.5mol / L sodium carbonate dilute lye and hot water respectively. The washing and neutralizing process is kept at about 40°C, and the pH of the neutralizing solution is controlled to ~7. Press filtration to obtain 13.5 kg of lignocellulose solids (6.2 kg in dry weight); add 5 times the weight of water to the straw solids, stir evenly, and refine the pulp with a refiner to obtain corrugated paper pulp.

Embodiment 3

[0031] Chop the wheat straw to 2-5 cm, and sieve to remove dust. Take 10 kg of chopped clean wheat straw and put it into a 60-liter micro-heat explosion reactor, feed sulfur trioxide gas at room temperature until the pressure in the reactor is ≤0.03Mpa, and keep it warm for 180 minutes; The straw is transferred to the washing and neutralizing equipment, and the acidic straw is washed and neutralized with 0.2mol / L potassium carbonate dilute lye and hot water respectively. The washing and neutralizing process is kept at about 50°C, and the pH of the neutralizing solution is controlled to ~7. Press filtration to obtain 13.8 kg of lignocellulose solid matter (6.9 kg in dry weight); add 7 times the weight of water to the straw solid matter, stir evenly, and refine the pulp with a refiner to obtain corrugated paper pulp.

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Abstract

The invention discloses a method for preparing corrugated paper pulp through sulfur trioxide micro-thermal explosion treatment of straw, and relates to the field of wood biomass utilization. The method comprises the following steps: introducing sulfur trioxide gas into straws at normal temperature and normal pressure to carry out micro-thermal explosion reaction, leaching and neutralizing the acidic straws subjected to micro-thermal explosion treatment by using a dilute alkali liquor to obtain a neutral hemicellulose aqueous solution and a lignocellulose solid, adding water into an obtained filter-pressed and washed solid, and pulping to obtain corrugated paper pulp. The corrugated paper pulp preparation method provided by the invention has the advantages of resource saving, no emission of three wastes, energy conservation and environmental protection, and solves the problems of large investment, low efficiency, high energy consumption and large pollution in the traditional papermaking and pulping industry.

Description

technical field [0001] The invention relates to the technical field of woody biomass utilization, and in particular to a method for pretreating straw with sulfur trioxide micro-heat explosion to obtain hemicellulose and lignocellulose substances, which are used to prepare corrugated pulp. Background technique [0002] Corrugated paper has the advantages of low cost, light weight, easy processing, high strength, excellent printing adaptability, and convenient storage and transportation. More than 80% of corrugated paper can be recycled and recycled, and can be used as packaging for express delivery, food or digital products, which is relatively environmentally friendly , is widely used, and is one of the main materials for making packaging containers that has been used for a long time and has shown rapid development so far. According to the 2019 annual report of China's paper industry, the consumption of corrugated base paper reached 23.74 million tons, while the production v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/22D21H11/12D21B1/06D21D1/20
CPCD21C3/22D21H11/12D21B1/06D21D1/20
Inventor 王健
Owner 王剑
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