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Technique for chemomechanical pulp-making of poplar wood

A chemical-mechanical and pulping technology, used in chemical/chemical-mechanical pulping, pulp beating/refining methods, pretreatment with alkaline compounds, etc. It can reduce the pollution load of wastewater, improve the yield and optical performance, and eliminate the scaling problem.

Inactive Publication Date: 2008-07-30
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiency of high-yield poplar chemical-mechanical pulping at present, the present invention provides a new high-brightness poplar chemical-mechanical pulping process, which fundamentally solves the problem of strong alkali in chemical-mechanical pulping. The use makes the pollution load of waste liquid higher, the optical properties of pulp are lower, the pulp yield is less, the problem of fouling of pipelines and equipment in pulping, and at the same time reduce the energy consumption of pulping

Method used

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Experimental program
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Effect test

specific Embodiment approach

[0027]The poplar chips are steamed after being screened. After steaming, the wood chips are squeezed and decomposed, and the pulp after decompression enters the pulping process. In the prior art, the hydrogen peroxide chemical mechanical pulping with sodium hydroxide as the alkali source is carried out with a solution containing sodium hydroxide, hydrogen peroxide, magnesium sulfate, ethylenediaminetetraacetic acid (EDTA) and sodium silicate After treatment, extrusion and decompression are carried out, and then the above solution is used for treatment. After treatment, the first stage of refining, high-consistency residence and the second stage of refining are carried out. In the present invention, the enzyme solution is firstly used for treatment, and after the treatment, extrusion and decompression are carried out, and after decompression, it is impregnated with a solution containing magnesium hydroxide, hydrogen peroxide and ethylenediaminetetraacetic acid (EDTA). Refining ...

Embodiment 1

[0030] After five-year-old poplar wood chips are steamed and extruded, pulping is carried out according to the following steps:

[0031] 1. Enzyme treatment, the conditions are: slurry concentration 12%, temperature 40-50°C, time 1.5h, pH value 5-6, enzyme dosage 100IU / (g dry slurry), the enzyme used is laccase.

[0032] 2. Squeeze and decompress the slurry treated in the above step 1, and the decompression compression ratio is 4:1 volume ratio. Chemical pre-impregnation with magnesium alkali hydrogen peroxide solution, the process conditions of impregnation treatment are: temperature 70°C, slurry concentration 25%, time 30min, Mg(OH) 2 2.0% (relative to the weight of absolute dry pulp), 1.0% of EDTA (relative to the weight of absolute dry pulp), 6.0% (relative to the weight of absolute dry pulp), hydrogen peroxide.

[0033] 3. The slurry impregnated in step 2 and all the soaking liquid are subjected to the first stage of refining, the refining pressure is normal pressure, th...

Embodiment 2

[0038] After five-year-old poplar wood chips are steamed and extruded, pulping is carried out according to the following steps:

[0039] 1. Enzyme treatment. The conditions are: slurry concentration 15%, temperature 40-50°C, time 1.5h-2.0h, pH value 5-6, enzyme dosage 30IU / (g dry slurry). The enzyme used is a combined enzyme of laccase and manganese peroxidase with a mass ratio of 4:1.

[0040] 2. Squeeze and decompress the slurry treated in the above step 1, and the decompression compression ratio is 6:1 volume ratio. The slurry after extrusion and defrosting is impregnated with magnesium alkali hydrogen peroxide solution. The process conditions of dipping treatment are: temperature 50°C, slurry concentration 20%, time 50min, Mg(OH) 2 1.0% (relative to the weight of absolute dry pulp), 1.0% of EDTA (relative to the weight of absolute dry pulp), 4.0% of hydrogen peroxide (relative to the weight of absolute dry pulp).

[0041] 3. The slurry treated in the above step 2 toget...

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Abstract

The invention relates to a pulp technology of aspen by using a chemical-mechanical method. Aspen sizing agent which is decatized and is extruded and dispersed for a space is infused in peroxide using magnesium hydrate as an alkali source and is mechanically grinded by adopting the enzyme pretreatment technique, then the sizing agent high density storage bleaching is acted, finally, chemical-mechanical pulp with high whiteness and high yield is manufactured through a second stage jordaning production. The method of the invention realizes that the pulp yield and the optical performance are increased, the energy consumption for jordaning is lowered, the load of wastewater pollution is lowered, and the scale formation problem is eliminated.

Description

technical field [0001] The invention belongs to the technical field of chemical mechanical pulping, and in particular relates to a poplar chemical mechanical pulping process. Background technique [0002] my country is a big producer of pulp and a big consumer of paper and cardboard. At present, my country's total consumption and production of paper and cardboard are second only to the United States, ranking second in the world. In the world, except for a few countries such as China and India, the raw materials of the pulp and paper industry in most countries are mainly wood, accounting for more than 90%. For quite a long period of time in the past, my country's pulp and paper industry has been pursuing the guidelines of "grass-based" and "both grass and trees". Not high, poor international competitiveness. In order to reverse this situation, my country is implementing the integration of forestry and paper, gradually increasing the proportion of wood fiber raw materials. ...

Claims

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Application Information

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IPC IPC(8): D21H11/02C12S3/08D21C1/06D21B1/30D21D1/20
Inventor 孔凡功王守娟杨桂花陈嘉川张伟
Owner QILU UNIV OF TECH
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