Producing technology for microcrystalline cellulose with waste acid cotton linter

A technology of microcrystalline cellulose and production technology, which is applied in the regeneration of pulping liquid, fiber raw material treatment, papermaking, etc., can solve environmental water source pollution and other problems, achieve high cellulose content, facilitate discharge standards, and broaden applications field effect

Inactive Publication Date: 2007-11-07
王光建 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of waste acid fleece processing, a very important link is bleaching and cleaning. The above-mentioned bleaching process is polychlorine bleaching. The bleaching agent is elemental chlorine or chlorine-containing compounds, such as hypochlorite, including sodium hypochlorite and calcium hypochlorite. , the bleaching wastewater contains highly toxic substances and a large amount of adsorbable organic halides, which will cause serious pollution to the environment, especially water sources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a. Soaking: send the waste acid cashmere into the soaking tank through a mechanical feeder for soaking treatment, add the bleaching liquid and rinsing wastewater discharged from the bleaching process into the soaking tank for recycling, and then stir at a stirring speed of 10 revolutions per minute. Make the concentration of the slurry in the pool at 6%, and pre-bleach the waste acid cashmere for 60 minutes;

[0032] b. Removal of slag: The soaked waste acid cashmere is stripped of various impurities after absorbing water and swelling. Use a slag remover to remove impurities by swirling at an inlet pressure of 0.3MPa, and use a centrifugal sieve with a 0.8mm aperture to remove the waste Impurities in acid fleece;

[0033] c, bleaching: waste acid velvet pulp concentration: 8%, use chlorine dioxide as bleaching agent, sodium hydroxide as neutralizer, and adopt DED (chlorine dioxide section + alkali section + chlorine dioxide section) to carry out three sections Bleachin...

Embodiment 2

[0043] a. Soaking: Send the waste acid cashmere into the soaking tank for soaking treatment, add the bleaching liquid and rinsing wastewater discharged from the bleaching process into the soaking tank for recycling, and then stir at a stirring speed of 15 revolutions per minute to make the slurry concentration at 5 %, do pre-bleaching treatment to waste acid cashmere, time 30 minutes;

[0044] b. Removal of slag: soaked waste acid velvet is stripped of various impurities after absorbing water and swelling. Use a slag remover to remove impurities by swirling at an inlet pressure of 0.5MPa, and use a centrifugal sieve with a 1mm aperture to remove waste acid velvet. impurities in

[0045] c, bleaching: waste acid velvet pulp concentration: 10%, use ozone as bleaching agent, sodium carbonate as neutralizing agent, and adopt DEZ (chlorine dioxide section+alkali section+ozone section) to carry out three-stage bleaching, bleaching agent concentration : 0.7%, dosage: 10kg / t slurry; ...

Embodiment 3

[0054] a. Soaking: Send the waste acid cashmere into the soaking tank for soaking treatment, add the bleaching solution and rinsing wastewater discharged from the bleaching process into the soaking tank for recycling, and then stir at a stirring speed of 30 revolutions per minute to make the slurry concentration at 4 %, do pre-bleaching treatment to waste acid cashmere, time 40 minutes;

[0055] b. Removal of slag: The soaked waste acid cashmere is stripped of various impurities after absorbing water and swelling. Use a slag remover to remove impurities by swirling at an inlet pressure of not less than 0.4MPa, and use a centrifugal sieve with a 1.5mm aperture to remove impurities. Remove impurities in waste acid wool;

[0056] c, bleaching: waste acid velvet pulp concentration: 15%, use hydrogen peroxide as bleaching agent, sodium bicarbonate as neutralizer, and adopt PEZ (hydrogen peroxide section+alkali section+ozone section) to carry out three-stage bleaching, Bleaching ag...

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Abstract

The process of producing microcrystalline cellulose with waste acid lint includes the steps of: soaking, eliminating residue, bleaching, washing, eliminating residue for the second time, concentrating and dewatering, drying, and sieving. The bleaching procedure is one three section one, and uses one of chlorine dioxide, ozone and hydrogen peroxide as the bleaching agent and alkali as the neutralizing agent. The bleaching procedure has low water consumption, less waste drainage, selective elimination of pigment and impurity in fiber and less damage to fiber, and the bleached product has low viscosity, high whiteness, high cellulose content, raised chemical reaction activity, high product quality and wide application range.

Description

Technical field: [0001] The invention relates to a production process for producing microcrystalline cellulose from waste acid wool. Background technique: [0002] At present, in the process of cotton seed processing, a large amount of powdery waste acid fleece is produced. Due to the residual sulfuric acid in the waste acid fleece, not only the smell is pungent, but also it is easy to float around with the wind and pollute the environment. It has been treated as waste for deep burial or incineration for a long time, which will have extremely adverse effects on the growth of crops and the atmospheric environment. In recent years, the development and utilization of waste acid velvet has attracted more attention. While developing and utilizing waste acid velvet, how to effectively control and greatly reduce the secondary pollution caused by waste acid velvet processing should be based on circular economy. To understand this issue from a strategic height of sustainable develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C9/10D21C11/00D21D5/18D21C9/18
Inventor 王光建冯锦祥
Owner 王光建
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