Unbleached pulp production method for increasing whiteness of pulp

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: 2014-07-16
山东济清科技服务有限公司
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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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  • Unbleached pulp production method for increasing whiteness of pulp

Examples

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Comparison scheme
Effect test

Embodiment 1

[0042] Example 1. Making natural pulp from poplar wood

[0043] Cut poplar wood into wood chips with a size of about 30mm×4mm×2mm. Firstly, sodium percarbonate is used for pretreatment. The pretreatment conditions are: sodium percarbonate 2.5%, sodium hydroxide 1.0%, and pentasodium diethyltriaminepentaacetic acid. 0.2%, add water, liquid ratio 1:6, pretreatment temperature 110℃, time 90min. After pretreatment, it is washed with hot water at 60-80°C and concentrated to a dryness of 45% by weight. Then organic solvent cooking is carried out, the liquid ratio is 1:8, and 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 30 minutes. 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 and numbered 1-6 respectively. After cooking, the pulp is washed with...

Embodiment 2

[0049] Example 2: Making natural paper pulp from bamboo raw materials

[0050] The bamboo is cut into bamboo pieces with a size of about 25×3.5mm×1.8mm, and first pretreated with sodium percarbonate. The treatment conditions are: sodium percarbonate 3.0%, sodium hydroxide 1.0%, diethyltriaminepentaacetic acid Sodium 0.2%, add water, liquid ratio 1:8, temperature 120℃, time 90min. After pretreatment, washing is carried out, and then organic solvent cooking is carried out. The cooking conditions are: the concentration of organic solvent (v / v) in the cooking liquor is 85%, among which the concentrations of formic acid, acetic acid and acetone (v / v) are 65% and 10 % And 10%, liquid ratio 1:8, temperature 140℃, time 40min. After cooking, the pulp is washed with 80-85℃ formic acid and 80-90℃ hot water. The kappa value of the obtained natural color pulp is 16.5, the whiteness is 42.2% ISO, and the yield is 42.0%.

Embodiment 3

[0052] Example 3 Making unbleached pulp from wheat straw

[0053] Cut wheatgrass into grass slices with a length of about 25mm, and first use sodium percarbonate for pretreatment. The pretreatment conditions are: sodium percarbonate 3.0%, diethyltriaminepentaacetic acid pentasodium 0.2%, water, liquid ratio 1:7, The temperature is 125°C, and the pretreatment time is 90 minutes. Washing after pretreatment, and then organic solvent cooking. The cooking conditions are: the concentration of organic solvent in the cooking liquor is 85% (v / v), in which the concentration of formic acid (v / v) is 60%, and the concentration of acetic acid (v / v) is 10 %, acetone concentration (v / v) 15%, liquid ratio 1:8, temperature 130°C, time 30min. After cooking, the pulp is washed with 80-85℃ formic acid and 80-90℃ hot water. The kappa value of the obtained natural color pulp is 9.5, the whiteness is 44.0% ISO, and the yield is 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 production method of natural color pulp for improving the whiteness of paper pulp, and belongs to the field of natural color pulp production. Background technique [0002] The current production methods of pulp mainly include production processes such as chemical, semi-chemical, mechanical and chemical mechanical methods. Among them, chemical pulping occupies a dominant position among many pulping methods at present. The pulp made by chemical cooking is called natural pulp. The low whiteness of natural pulp limits its application. Natural pulp generally needs to be bleached to produce higher grade paper. If the whiteness of the natural color pulp can be improved during the pulping process, the trouble of subsequent bleaching can be eliminated, the production process can be simplified, the production cost can be reduced, and the use value of the natural color pulp can be improved. [0003] In the production process of uncolored pul...

Claims

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Application Information

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Patent Type & Authority Applications(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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