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Method for pulping through needlebush pre-conditioning refiner chemical alkaline peroxide mechanical pulp (P-RC APMP)

A coniferous wood and pulping technology is applied in the field of pulping and papermaking to achieve the effects of reducing resin barriers, improving pulp whiteness, and reducing pulp resin content

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

[0007] In order to solve the above problems of low chemical impregnation efficiency, high energy consumption for refining, large strength loss, and sticking rolls and sticking webs in the pulping process of softwood P-RC APMP, The invention provides a method for pulping coniferous wood P-RC APMP that improves fiber quality, increases pulp whiteness, reduces pulp resin content, and alleviates resin barriers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The conventional chemical pretreatment conditions for P-RC APMP pulping of Simao pine are: the dosage of sodium hydroxide is 2.5%, the dosage of hydrogen peroxide is 2.3%, the dosage of sodium silicate is 2%, the dosage of magnesium sulfate is 0.05%, and the dosage of ethylenediaminetetraacetic acid is 0.05%. The dosage is 0.2%, the temperature is 70°C, the liquid ratio is 1:4, and the time is 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 3.3%, 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 65°C, the liquid ratio is 1:4, and the time is 23 min. After the treatment, a stage of refining was carried out, and after the stage of refining, a high-consi...

Embodiment 2

[0023] The chemical pretreatment conditions of conventional taeda pine P-RC APMP pulping are: the chemical treatment conditions of the first stage are sodium hydroxide dosage 2.5%, hydrogen peroxide dosage 2.7%, sodium silicate dosage 3%, magnesium sulfate dosage 0.05%, ethylenediamine The dosage of tetraacetic acid is 0.2%, the temperature is 50°C, the liquid ratio is 1:4, and the time is 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. After the treatment, a stage of refining was carried out, and after the stage of refining, a high-consistency dwell...

Embodiment 3

[0026] The chemical pretreatment conditions of conventional fir P-RC APMP pulping are as follows: the chemical treatment conditions of the first stage are the dosage of sodium hydroxide 3.0%, the dosage of hydrogen peroxide 2.8%, the dosage of sodium silicate 2%, the dosage of magnesium sulfate 0.05%, the dosage of ethylenediaminetetra The dosage of acetic acid is 0.2%, the temperature is 75°C, the liquid ratio is 1:4, and the time is 45 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 4.0%, the amount of hydrogen peroxide is 3.8%, 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 30 min. After the treatment, a stage of refining was carried out, and after ...

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Abstract

The invention relates to the technical field of pulping and papermaking, in particular to a method for pulping through needlebush pre-conditioning refiner chemical alkaline peroxide mechanical pulp (P-RC APMP), wherein the first period of extrusion processing of needlebush pieces after being steamed is subjected, the first period of chemical processing is subjected after chemical liquid A is added, the chemical liquid A contains sodium dodecyl benzene sulfonate and octyl phenol polyoxyethylene ether (10), the second period of extrusion processing is subjected, the second period of chemical processing is subjected by adding chemical liquid B after the second period of extrusion, the chemical liquid B contains the sodium dodecyl benzene sulfonate and the octyl phenol polyoxyethylene ether (10), the first period of defibrination is subjected after processing and stops, and then the second period of defibrination and eliminate hidden processing are subjected to obtain needlebush P-RC APMP paper pulp. The method for pulping through needlebush P-RC APMP strengthens chemical action of impregnation liquid and dissolution of reactants, softens fiber materials, reduces subsequent pulping energy consumption, improves fiber quality, increases pulp whiteness, reduces pulp resin content, and reduces resin obstacle.

Description

[0001] technical field [0002] The invention relates to the technical field of pulping and papermaking, in particular to a method for pulping softwood P-RC APMP. Background technique [0003] P-RC APMP (Preconditioning Refiner Chemical APMP) is an improvement of conventional APMP pulping technology. P stands for the pretreatment before refining, and RC stands for the reasonable distribution between the chemical reaction of disc refining to promote pulp and the bleaching reaction of wood chips after prepreg. In order to achieve the best bleaching efficiency, the P-RC process requires relatively mild pretreatment, and most of the bleaching reactions are completed under the chemical pretreatment conditions of refining. The residence time of the slurry in the disc refiner is short, and a high-concentration residence reaction process is required after refining. The biggest advantage of using the P-RC system is that the conditions of high temperature, high concentration and ...

Claims

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Application Information

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