Enzymatic straw material pulping process

A raw material and pulping technology, which is applied in the fields of cellulose raw material pulping, fiber raw material processing, chemical/chemical mechanical pulping, etc., can solve the problems of inappropriate grass raw materials, reduced pulping yield, and inability to meet the needs of quality. , to achieve the effect of shortening biological treatment time, reducing the amount of alkali consumed, and ensuring quality uniformity

Inactive Publication Date: 2003-06-04
SHANDONG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in chemical composition and structure between grass raw materials and wood raw materials, the biopulping process researched and developed with wood as raw materials is not suitable for grass raw materials
In addition, in terms of biological treatment methods, existing biological treatment processes, such as the invention patent "biomechanical straw pulp process and its special equipment" (application number 96115824.7), the invention patent "biological delignification-mechanical pulping technology" ( Application No. 97101537.6), invention patent "Technology for Biological Pretreatment of Chemi-Mechanical Pulp Straw Pulp" (Application No. 01107892.8), etc., all use microorganisms to directly process raw materials. Their main disadvantages are: (1) The biological treatment cycle is long, and generally It takes a few days; (2) before the microbial treatment, the r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0032] The raw material is wheat straw, add water according to the ratio of water volume (ml) to wheat straw dry weight (gram) ratio of 25:1, after soaking with water, disperse into fiber filaments with a refiner, the gap between the grinding discs is 1mm, and the fiber filaments Fully mix the mixed crude enzyme liquid with water, hemicellulase and lignin peroxidase in a cooking pot, the liquid ratio is 1:6, and keep it at pH 4.0 for 10 hours at 40°C, the hemicellulose The dosage of enzyme is 4IU per gram of absolute dry raw material, and the dosage of lignin peroxidase is 0.3IU per gram of absolute dry raw material. After enzyme treatment, the raw material is first soaked with cooking waste liquid for 30min, and the residual alkali concentration of waste liquid is 10g / l (NaOH meter), after the presoaking is completed, the waste liquid is extruded with a screw extruder, and then the extruded raw materials are cooked in a cooking pot. The cooking conditions are: 6% NaOH, heating...

Embodiment 3

[0035] The raw material is bagasse, add water according to the ratio of 20:1 of water volume (ml) and wheat straw dry weight (gram), after soaking in water, disperse into fiber filaments with a refiner, the gap between the grinding discs is 0.5mm, and the fiber Silk is fully mixed with water, hemicellulase and lignin peroxidase mixed crude enzyme solution in a cooking pot, the liquid ratio is 1:6, kept at pH 4.5, 45 ℃ for 4 hours, the hemifiber The amount of suzyme is 20IU per gram of absolute dry raw material, and the dosage of lignin peroxidase is 0.7IU per gram of absolute dry raw material. After enzyme treatment, the raw material is first soaked with cooking waste liquid for 15min, and the residual alkali concentration of the waste liquid is 5g / 1 (NaOH meter), after the presoaking is completed, the waste liquid is extruded with a screw extruder, and then the extruded raw materials are cooked in a cooking pot. The cooking conditions are: 14% NaOH, heating time 80min, liquid...

Embodiment 4

[0037] The raw material is wheat straw, add water according to the ratio of water volume (ml) to wheat straw dry weight (gram) ratio of 20:1, after soaking with water, disperse into fiber filaments with a refiner, the gap between the grinding discs is 0.5mm, and the fiber The silk is fully mixed with water and hemicellulase solution in a cooking pot, and treated at a liquid ratio of 1:10, pH5.0, and 50°C for 1 hour. The amount of hemicellulase is 10IU per gram of absolute dry raw material. After treatment, the raw material was washed thoroughly with tap water and then dissolved in 0.5% EDTA, 6% NaOH, 4% HO 2 o 2 , 60°C, 60min under the condition of 10% concentration, the raw material after chemical pretreatment is concentrated and dehydrated, and the refining machine is used for 2-stage refining under normal pressure, the refining concentration is 20%, and the refining gap is 0.2mm and 0.1 mm, after grinding, the slurry is washed, depotent, and screened, and two stages of hyd...

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PUM

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Abstract

The enzymatic straw material pulping process includes three stages of mechanical pre-treatment, enzyme treatment and chemical pulping or chemical-mechanical pulping. After being pretreated mechanically in a pulp grinder, the straw material is treated with hemicellulase liquid or mixed enzyme liquid comprising hemicellulase and lignin peroxidase at pH 3.5-6.5 and 40-60 deg.c for 1-10 hr. In chemical pulping, the material is presoaked with waste pulp-making liquor before extruding out wastes liquor and digested; and in chemical-mechanical pulping, the material is first treated with EDTA, NaOH and H2O2 at 40-80 deg.c for 30-120 min and then ground to form the pulp. The present invention is used in papermaking enterprises with straw as material and has the advantages of low pollution load, high, paper pulp quality, easy-to-process waste liquor, etc.

Description

(1) Technical field [0001] The invention relates to an enzymatic pulping method, in particular to a method for enzymatic pulping using grass raw materials. (2) Background technology [0002] Grass raw materials, such as wheat straw, are the main raw materials of my country's paper industry, accounting for more than 50% of the raw materials of my country's paper industry, which are mainly used to produce chemical pulp. However, the traditional chemical pulping process, such as caustic soda method, sulfate method, etc., is used to produce straw chemical pulp, and a large amount of black liquor produced in the production process has high viscosity, low organic content, high silicon content, and low calorific value. characteristics, making it difficult to effectively recycle, causing serious environmental pollution problems. According to statistics, in 1998, the chemical oxygen demand (COD) in the wastewater discharged by my country's pulp and paper industry accounted for about...

Claims

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Application Information

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IPC IPC(8): D21C3/00D21H11/02D21H11/12
Inventor 赵建李雪芝曲音波高培基
Owner SHANDONG UNIV
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