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A kind of natural pulp production method for improving pulp whiteness

A production method and pulping technology, applied in papermaking, textiles and papermaking, pulping with organic solvents, etc., can solve the problems of low whiteness, low whiteness of natural pulp, environmental pollution of natural pulp, etc., and achieve the effect of improving whiteness

Active Publication Date: 2016-06-01
山东济清科技服务有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problems of environmental pollution and low whiteness of the natural pulp produced by the traditional kraft method or caustic soda-anthraquinone pulping process and the low brightness of the natural pulp produced by the existing organic acid pulping technology, and provides a A kind of natural color pulp production method that improves pulp whiteness

Method used

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  • A kind of natural pulp production method for improving pulp whiteness

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Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1, poplar wood raw material system natural color pulp

[0043] Poplar wood is cut into wood chips with a size of about 30mm×4mm×2mm, first pretreated with sodium percarbonate, the pretreatment conditions are: 2.5% sodium percarbonate, 1.0% sodium hydroxide, pentasodium diethyltriaminepentaacetate 0.2%, add water, liquid ratio 1:6, pretreatment temperature 110°C, time 90min. After pretreatment, it is washed with hot water at 60-80° C., and then concentrated to a dryness of 45 wt%. Then carry out organic solvent cooking, the liquid ratio is 1:8, the cooking conditions are: the organic solvent concentration (v / v) in the cooking liquid is 90%, the balance is water; the temperature is 135°C, and the time is 30min. The organic solvent is a combination of formic acid, acetic acid and acetone, wherein the concentration (%, volume ratio) of formic acid, acetic acid and acetone is changed, respectively numbered 1-6. After cooking, the pulp is washed with formic acid ...

Embodiment 2

[0049] Embodiment 2, natural color paper pulp of bamboo raw material system

[0050] Bamboo is cut into bamboo slices with a size of about 25×3.5mm×1.8mm, firstly pretreated with sodium percarbonate, the treatment conditions are: 3.0% sodium percarbonate, 1.0% sodium hydroxide, diethyltriaminepentaacetic acid penta Sodium 0.2%, add water, liquid ratio 1:8, temperature 120°C, time 90min. Carry out washing after pretreatment, then carry out organic solvent cooking, cooking condition is: organic solvent concentration (v / v) 85% in the cooking liquid, wherein, the concentration (v / v) of formic acid, acetic acid and acetone is respectively 65%, 10% % and 10%, liquid ratio 1:8, temperature 140°C, time 40min. After cooking, the pulp is washed with formic acid at 80-85°C and hot water at 80-90°C. The kappa value of the obtained natural color pulp was 16.5, the brightness was 42.2%ISO, and the yield was 42.0%.

Embodiment 3

[0052] Embodiment 3, wheat straw raw material system natural color pulp

[0053] Cut the wheat straw into grass slices with a length of about 25mm, firstly use sodium percarbonate to pretreat, the pretreatment conditions are: 3.0% sodium percarbonate, 0.2% pentasodium diethyltriaminepentaacetate, add water, the liquid ratio is 1:7, The temperature is 125°C, and the pretreatment time is 90 minutes. Carry out washing after pretreatment, then carry out organic solvent cooking, cooking condition is: organic solvent concentration 85% (v / v) in the cooking liquor, wherein, formic acid concentration (v / v) 60%, acetic acid concentration (v / v) 10% %, acetone concentration (v / v) 15%, liquid ratio 1:8, temperature 130°C, time 30min. After cooking, the pulp is washed with formic acid at 80-85°C and hot water at 80-90°C. The kappa value of the obtained natural color pulp was 9.5, the brightness was 44.0%ISO, and the yield was 41.0%.

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Abstract

The invention relates to an unbleached pulp production method for increasing the whiteness of pulp. The method comprises the following steps: pre-treating a plant fiber material with sodium percarbonate; stewing the pre-treated plant fiber material with a mixed organic solvent of methane acid, acetic acid and acetone; washing the pulp after sewing with the methane acid and hot water; and preparing the unbleached pulp. The method can be used for increasing the whiteness of the unbleached pulp obviously.

Description

technical field [0001] The invention relates to a method for producing unbleached pulp for improving the whiteness of pulp, and belongs to the field of unbleached pulp production. Background technique [0002] The current pulp production methods mainly include chemical, semi-chemical, mechanical and chemical-mechanical processes. Among them, chemical pulping occupies a dominant position among many pulping methods at present. The pulp prepared by chemical cooking is called natural pulp. The low brightness of natural pulp limits its application. Generally, natural pulp can only be produced after bleaching to produce higher-grade paper. If the whiteness of the natural pulp can be improved during the pulping process, the trouble of subsequent bleaching can be saved, the production process can be simplified, the production cost can be reduced, and the use value of the natural pulp can be increased. [0003] In the production process of natural pulp, for wood raw materials, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/04D21C3/20D21C1/00
Inventor 李宗全秦梦华傅英娟
Owner 山东济清科技服务有限公司
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