Method for producing high whiteness cotton pulp by using cotton linter

A technology of cotton linters and high whiteness is applied in the field of using cotton linters to produce high-whiteness cotton pulp, which can solve the problems of increasing processing waste liquid discharge, increasing raw material consumption, reducing production efficiency, etc., and reducing equipment Corrosion, reduce processing burden, reduce the effect of material consumption

Inactive Publication Date: 2008-01-16
CHTC HELON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, people currently use cotton linters to produce pulp. Due to defects in production technology, the whiteness of pulp after cooking and pulping is low. In order to obtain pulp with higher whiteness, people often use cotton linters to cook Strengthen the intensity of alkali refin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Pre-hydrolysis of raw materials: loosen the linters and remove impurities, then perform pre-hydrolysis, liquid ratio 1:3, temperature 160°C, time 120 minutes, after pre-hydrolysis, drain liquid under pressure, and then rinse with water;

[0023] 2) Cooking: The cooking condition is that the total alkali is 17% relative to the absolute dry pulp in terms of NaOH, the liquid ratio is 1:3, the addition of cooking aid green oxygen is 0.8% of the relative absolute dry pulp, and the total heating time is 150min , the number of small steam release times of cooking is 2 times, the first holding temperature is 150°C, the holding time is 17min, the second holding temperature is 172°C, the holding time is 160min, and the quality after cooking is 96.5% of Type A cellulose;

[0024] 3) Desanding and concentration: desanding slurry concentration 0.7±0.1%, desanding pressure 0.28Mpa, after desanding, concentrate the slurry to a slurry concentration of 3.0%;

[0025] 4) Chlorination:...

Embodiment 2

[0032] 1) pre-hydrolysis of raw materials: the III 3 Cotton-like linters and outer I First-grade cotton linters are mixed at a weight ratio of 60:40, loosened and removed, and then pre-hydrolyzed with a liquid ratio of 1:3.5, a temperature of 170°C, and a time of 160 min. flushing;

[0033] 2) Cooking: The cooking conditions are that the total alkali is 25% relative to the absolute dry pulp in terms of NaOH, the liquid ratio is 1:3.5, the addition of cooking aid green oxygen is 5% of the relative absolute dry pulp, and the total heating time is 240min , the number of times of steaming and steaming is 3 times, the first holding temperature is 130°C, the holding time is 23min, the second holding temperature is 155°C, the holding time is 200min, and the quality after cooking is 96.1% of Type A cellulose;

[0034] 3) Desanding and concentration: after desanding the cooked pulp until there are no small pulp lumps in the pulp, use a desanding slurry concentration of 0.7±0.1% and a...

Embodiment 3

[0042] 1) Pre-hydrolysis of raw materials: loosen the linters and remove impurities, then perform pre-hydrolysis, liquid ratio 1:3.2, temperature 165°C, time 140min, drain liquid under pressure after pre-hydrolysis, and then rinse with water;

[0043] 2) Cooking: The cooking conditions are that the total alkali is 20% of the absolute dry pulp in terms of NaOH, the liquid ratio is 1:3.3, the addition of cooking aid green oxygen is 3% of the relative dry pulp, and the total heating time is 200min , the number of small steam release times of cooking is 2 times, the first holding temperature is 140°C, the holding time is 20min, the second holding temperature is 165°C, the holding time is 220min, and the quality after cooking is 96.8% of Type A cellulose;

[0044] 3) Desanding and concentration: desanding slurry concentration 0.7±0.1%, desanding pressure 0.30Mpa, after desanding, concentrate the slurry to a slurry concentration of 3.2%;

[0045] 4) Chlorination: the amount of chlor...

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PUM

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Abstract

The invention discloses a simple method for producing high-whiteness cotton pulp from cotton linters as raw materials. The method comprises the steps of material preparation, prehydrolysis, boiling, loosening, desanding, concentration, chloridization, alkali purification, bleaching, acid treatment, desanding, concentration, paper making, and oven-drying. A mixture of NaOH and green oxygen is used in the boiling step. The invention has the advantages of simple and controllable process, low processing load posterior to the boiling step, reduced material consumption, less waste discharge, and low environmental pollution. The produced cotton pulp has high pulping fiber strength, yield and whiteness.

Description

technical field [0001] The invention relates to a cotton pulp production technology, in particular to a method for producing high-whiteness cotton pulp by using cotton linters. Background technique [0002] As the raw material of the textile industry, chemical fiber is growing day by day. According to statistics, by the mid-1990s, the world's chemical fiber production had accounted for 47% of the total textile fiber, and viscose fiber accounted for about one-fifth of chemical fiber. . The production of viscose fiber, the traditional method in the world is to use coniferous wood as raw material, but with the continuous improvement of pulping technology and the shortage of raw materials worldwide, hardwood is also used to produce viscose fiber abroad. In my country, because cotton resources are relatively abundant, and the cellulose content of cotton linters is as high as 95%, it is easy to produce pulp, so most manufacturers use cotton linters as raw materials to produce vis...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 田素峰桑洪波刘建华王东黄鲁
Owner CHTC HELON
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