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The preparation method of three velvet bleached pulp

A secondary bleaching and pulping technology, which is applied in pulp bleaching, textile and papermaking, and fiber raw material processing, can solve the problems of large amount of alkali consumption and serious environmental pollution, and achieve low equipment investment, low energy consumption, and lignin The effect of less dissolution

Active Publication Date: 2017-12-29
石河子市国力源环保制浆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the traditional alkaline method to make three-way cashmere pulp, the amount of alkali used is as high as about 20%, and the cooking yield is only about 22%, which is very serious for environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Unpack the commercially available three-way fleece, and compact it with a fiber compactor after dust removal and impurity removal.

[0017] (2) One-time bleaching: send the compacted three-screw wool to the first twin-screw refiner for rubbing and separating, and add 2.5-3% KOH, 0.5% Anthraquinone and 2.5-3% H 2 o 2 , control the outlet temperature of the twin-screw refiner to 120-125°C, and send the slurry obtained by grinding and separating into the reaction chamber, react for 65-70min, and wash;

[0018] (3) Secondary bleaching: send the slurry obtained in step (2) into the second twin-screw refiner, and add 2-2.5% Na 2 SiO 3 , 0.8-1% MgSO 4 , 1-1.2% of EDTA (ethylenediaminetetraacetic acid), 1.2-1.5 of TAED (tetraacetylethylenediamine) and 3-3.5% of H 2 o 2 , control the outlet temperature of the twin-screw refiner to 95-100°C, send the pulp out of the refiner into the reaction chamber, react for 65-70min, and wash to obtain three-pass wool bleached pulp. ...

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Abstract

The invention discloses a method for preparing bleached pulp of three-pass fleece, which comprises the following steps: after the three-pass fleece is removed, it is compacted and sent to a twin-screw refiner, and 2.5-3% of KOH, 0.5% of anthraquinone and 2.5-3% of anthraquinone and 2.5-3% of anthraquinone are added. 3% H2O2, control the outlet temperature at 120-125°C, send the obtained slurry into the reaction chamber, react for 65-70min, send it to the twin-screw refiner after washing, add 2-2.5% sodium silicate, 0.8- 1% magnesium sulfate, 1-1.2% EDTA, 1.2-1.5 TAED and 3-3.5% H2O2, control the outlet temperature at 95-100°C, and send the refined slurry into the reaction chamber for 65-70min , and washed to obtain three velvet bleached pulp. The method of the invention has the advantages of simple process, low energy consumption, less equipment investment, a pulping yield of up to 90-92%, and a high ratio of BODcr / CODcr in the middle water, which is very suitable for biological treatment.

Description

technical field [0001] The invention relates to a preparation method of triple velvet bleached pulp. Background technique [0002] my country is rich in cotton, and the cotton linter resources are very rich. If all the embossed cottonseeds are peeled off, the short fleece can be equivalent to 15-20% of the total output of leather surface. According to the order of stripping, cotton linters can be divided into first-line cashmere, second-line cashmere, and three-line cashmere. About 30% of the total cashmere yield is a cellulose resource that cannot be ignored. Since the length of the three-way fleece fiber is generally below 3mm, domestic manufacturers mainly use the three-way fleece as viscose fiber at present. When using the traditional soda method to make three-way cashmere pulp, the amount of alkali used is as high as about 20%, and the cooking yield is only about 22%, which is very serious for environmental pollution. Contents of the invention [0003] The technic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/16D21C9/10D21C5/00
Inventor 滕铁生张跃平
Owner 石河子市国力源环保制浆有限公司
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