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Continuous cotton pulp washing and bleaching process

A cotton pulp and process technology, applied in the field of washing and bleaching processes, to achieve high product quality, reduce production water consumption, and reduce costs

Active Publication Date: 2014-07-16
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at many deficiencies existing in the existing cotton pulp washing and bleaching process, and provides a water-saving washing and continuous bleaching process, in which a redesigned drum vacuum pulp washer is mainly used to replace the existing cotton pulp bleaching process. The commonly used horizontal belt washing machine uses countercurrent washing to wash the cotton pulp, which not only saves water but also has a good washing effect, reduces labor intensity, improves control accuracy, continuous production, and stable product quality.

Method used

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  • Continuous cotton pulp washing and bleaching process
  • Continuous cotton pulp washing and bleaching process

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The cooked cotton pulp enters the buffer pulp tower, and after passing through the concentration regulator, it is pumped to the high-concentration desander for preliminary desandering. After desanding, the pulp is beaten by a large taper refiner, and the beating degree is 28-32° SR, then further adjust the concentration to 0.5wt%, and then continuously enter 4 sets of vacuum washing machines in series for washing. The finished pulp enters the separately set vacuum pulp washing machine for further washing and concentration; the washing water produced at this time can be directly used to adjust the concentration of the pulp before entering the low-concentration desander through the closed pipeline, so as to realize the circulation of water resources use. Among them, the drum vacuum pulp washer, the key equipment in the process, has the following main structure: the filtrate flow channel 2 of the drum 1 of the pulp washer is gradually inclined from the transmission side B ...

Embodiment 2

[0032] The cooked cotton pulp enters the buffer pulp tower, and after passing through the concentration regulator, it is pumped to the high-concentration desander for preliminary desandering. After desanding, the pulp is beaten by a large taper refiner, and the beating degree is 28-30° SR, then further adjust the concentration to 1.5wt%, and then continuously enter 5 sets of vacuum washing machines in series for washing. The slurry enters the separately set vacuum pulp washing machine for further washing and concentration; the washing water produced at this time can be directly used to adjust the concentration of the slurry before entering the low-concentration desander through the closed pipeline, so as to realize the recycling of water resources . Among them, the drum vacuum pulp washer, the key equipment in the process, has the following main structure: the filtrate flow channel 2 of the drum 1 of the pulp washer is gradually inclined from the transmission side B to the non...

Embodiment 3

[0036] The cooked cotton pulp enters the buffer pulp tower, and after passing through the concentration regulator, it is pumped to the high-concentration desander for preliminary desandering. After desanding, the pulp is beaten by a large taper refiner, and the beating degree is 30-32° SR, then further adjust the concentration to 2wt%, and then continuously enter 4 sets of vacuum pulp washing machines in series for washing, and the washed pulp enters the middle pulp tank, and after adjusting the concentration to 1.5wt%, enters the low-consistency desander for further purification, after purification The slurry enters the separately set vacuum pulp washing machine for further washing and concentration; the washing water produced at this time can be directly used to adjust the concentration of the slurry before entering the low-concentration desander through the closed pipeline, so as to realize the recycling of water resources . Among them, the drum vacuum pulp washer, the key ...

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Abstract

The invention belongs to the cotton pulp field and particularly provides a water-saving continuous cotton pulp washing and bleaching process, wherein a redesigned drum-type vacuum washer is used to replace the frequently-used horizontal belt washer for cotton pulp dreg bleaching. A countercurrent washing method is used for washing the cotton pulp, not only is water saved, but also the washing effect is good, the labor intensity is reduced, the control accuracy is improved, continuous production is achieved, and the product quality is stable.

Description

technical field [0001] The invention relates to a washing and bleaching process in the dissolving pulp manufacturing industry, in particular to a continuous washing and bleaching process for cotton pulp. Background technique [0002] Cotton pulp, also known as refined cotton pulp, is a high-purity cellulose made from cotton linters, which is refined by alkaline cooking and rinsing. It is mainly used in the manufacture of cellulose acetate, nitrocellulose and ether cellulose, and is widely used in food, medicine, toothpaste, daily chemicals, building materials, papermaking, electronics, plastics, aerospace and military industries. [0003] The current cotton pulp production is generally divided into several processes of cooking, washing, bleaching and papermaking. The main equipment currently used in the washing process is a belt washer or even a tank washer, which not only consumes a lot of water, cannot realize remote automatic control, but also has poor washing effect and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/12D21C9/02D21C9/10
Inventor 李春赵传令魏建设
Owner CHAMBROAD CHEM IND RES INST CO LTD
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