Method for APMP (Alkaline Peroxide Mechanical Pulp) pulping of needlebush

A technology for coniferous wood and pulping, which is applied in the directions of pulping with inorganic alkali, pulping with organic solvents, pulping with cellulose raw materials, etc., to achieve the effects of reducing content, reducing energy consumption for refining and improving pulp whiteness

Inactive Publication Date: 2013-02-13
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above softwood in the APMP pulping process, the impregnation efficiency is low, the refining energy consumption is high, the strength loss is large, and the problems of sticking rolls and pasting nets, the present invention provides A method for improving the strength and whiteness of coniferous wood APMP pulp and solving the problem of sticking rolls and webs in the pulping process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The chemical pretreatment conditions for conventional larch APMP pulping are as follows: the dosage of sodium hydroxide in the first stage of chemical treatment is 1.8%, the dosage of hydrogen peroxide is 2.0%, the dosage of sodium silicate is 3%, the dosage of magnesium sulfate is 0.05%, and the dosage of ethylenediaminetetraacetic acid is 0.2%. , temperature 55°C, liquid ratio 1:4, time 60 min. After the treatment, the second-stage extrusion is carried out, and the second-stage chemical treatment is carried out by the second-stage extrusion. The processing conditions are: the amount of sodium hydroxide is 2.5%, the amount of hydrogen peroxide is 2.7%, the amount of sodium silicate is 3%, and the amount of magnesium sulfate is 0.05%. , the dosage of ethylenediaminetetraacetic acid is 0.3%, the temperature is 60°C, the liquid ratio is 1:4, and the time is 75min. Under the treatment process conditions, the beating degree of pulp obtained is 52.2 O SR, the energy consump...

Embodiment 2

[0022] The chemical pretreatment conditions for conventional taeda pine APMP pulping are: the first stage of chemical treatment conditions is 2.5% sodium hydroxide, 2.7% hydrogen peroxide, 3% sodium silicate, 0.05% magnesium sulfate, and ethylenediaminetetraacetic acid. 0.2%, temperature 50°C, liquid ratio 1:4, time 55 min. After the treatment, the second-stage extrusion is carried out, and the second-stage chemical treatment is carried out by the second-stage extrusion. The processing conditions are: the amount of sodium hydroxide is 2.0%, the amount of hydrogen peroxide is 2.2%, the amount of sodium silicate is 3%, and the amount of magnesium sulfate is 0.05%. , the dosage of ethylenediaminetetraacetic acid is 0.3%, the temperature is 55℃, the liquid ratio is 1:4, and the time is 75 min. Under the treatment process conditions, the beating degree of pulp obtained is 48.6 O SR, the refining energy consumption is 1572 kW·h / t pulp, the brightness is 56.8%ISO, and the bulk is 2....

Embodiment 3

[0025] The chemical pretreatment conditions for conventional fir APMP pulping are as follows: the chemical treatment conditions of the first stage are the dosage of sodium hydroxide 1.5%, the dosage of hydrogen peroxide 1.7%, the dosage of sodium silicate 3%, the dosage of magnesium sulfate 0.05%, the dosage of ethylenediaminetetraacetic acid 0.2 %, temperature 60°C, liquid ratio 1:4, time 50 min. After the treatment, the second-stage extrusion is carried out, and the second-stage chemical treatment is carried out by the second-stage extrusion. The processing conditions are: the amount of sodium hydroxide is 3.5%, the amount of hydrogen peroxide is 3.6%, the amount of sodium silicate is 3%, and the amount of magnesium sulfate is 0.05%. , the dosage of ethylenediaminetetraacetic acid is 0.3%, the temperature is 70°C, the liquid ratio is 1:4, and the time is 50 min. Under the treatment process conditions, the beating degree of pulp obtained is 45.4O SR, the energy consumption of...

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Abstract

The invention relates to the technical field of APMP (Alkaline Peroxide Mechanical Pulp) pulping, in particular to a method for the APMP pulping of a needlebush. The method comprises steps as follows: extruding a steamed needlebush piece at the first section; adding chemical medicine liquid A to the extruded piece for chemical processing at the first section, wherein the chemical medicine liquid A includes sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether; extruding at the second section after the first chemical processing; chemically processing after the extruding at the second section, wherein the chemical medicine liquid B includes sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether; then washing after the processing; grinding into pulp; and depositing so as to obtain the needlebush APMP pulping. According to the method, a chemical effect of dipping liquid is improved, a reaction product is deposited, a fiber material is softened, so that energy consumption in follow-up pulping is reduced, quality of the fiber is greatly improved, whiteness of the pulp is improved, content of resin of paper pulp is reduced, and a resin barrier is decreased.

Description

[0001] technical field [0002] The invention relates to the technical field of APMP pulping, in particular to a softwood APMP pulping method. Background technique [0003] APMP is Alkaline Peroxide Mechanical Pulp, which is developed on the basis of BCTMP (Bleached Chemical Thermomechanical Pulp). Because of the high energy consumption of BCTMP, the discharged wastewater cannot be extracted at a high level and contains sulfur compounds. The APMP pulping system can produce BCTMP equal to or better than hardwood or softwood, and can alleviate the above shortcomings to a certain extent. [0004] The basic process of APMP includes: wood chip steaming → one-stage extrusion → one-stage chemical impregnation → second-stage extrusion → second-stage chemical impregnation → refining → latent elimination. The biggest advantage of pulping is that pulping and bleaching are combined into one, and the bleaching process is completed while pulping. Pulping and bleaching are accomplish...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/20D21C3/22
Inventor 庞志强陈嘉川董翠华杨桂花王振
Owner QILU UNIV OF TECH
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