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Clean pulping technology for high-polymerization-degree bamboo pulp

A clean pulping, high degree of polymerization technology, applied in the direction of pulping with inorganic alkali, pulp dewatering, pulp bleaching, etc., can solve the problems of backward technology, pollution, insufficient raw materials for the production of dissolving pulp with high polymerization degree, etc., to solve the difficulty of governance Large, impact and hazard mitigation effects

Inactive Publication Date: 2015-06-17
SICHUAN KANGQI BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above technical problems, the present invention provides a clean pulping method of high-polymerization bamboo pulp that solves the problems of insufficient raw materials for the production of high-polymerization dissolving pulp, backward technology, and serious pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Cut the bamboo directly into lengths of 10-50mm and widths of 5-20mm, and use a dry method to remove impurities such as mud sand, knots and chips through a dust collector. After dust removal, send it to a cooking pot for pre-hydrolysis treatment. The liquid ratio is 1 : 0.5, the temperature is 150°C, and the holding time is 80 minutes;

[0063] (2) After hydrolysis, the slurry is subjected to hot alkali extraction, and the amount of alkali used is 6% (Na 2 O meter), lye concentration 85g / L (Na 2 O meter), time 100min, temperature 140℃;

[0064] (3) The pulp after extraction is cooked by kraft method, and the amount of alkali used is 30% (Na 2 O meter), the holding time is 30min, the temperature is 130℃, the liquid ratio is 1:4, and the vulcanization degree is 15%;

[0065] (4) O P D. 0 E. OP (P ax D. 1 ) A bleaching, bleaching technical conditions are: O P Bleaching means that after being preheated by the double-roller mixer, it enters the medium-consistenc...

Embodiment 2

[0068] (1) Cut bamboo directly into lengths of 10-50mm and widths of 5-20mm, using a wet method, wash off surface impurities and remove excess water after a grass washer, and then enter a digester for pre-hydrolysis treatment, with a liquid ratio of 1: 1.3, the temperature is 130°C, and the holding time is 180min;

[0069] (2) After hydrolysis, the slurry is subjected to hot alkali extraction, and the amount of alkali used is 15% (Na 2 O meter), lye concentration 80g / L (Na 2 O gauge), time 40min, temperature 100℃;

[0070] (3) The extracted slurry is cooked by caustic soda method, and the amount of alkali used is 15% (Na 2 O meter), holding time 120min, temperature 160℃, liquid ratio 1:3;

[0071] (4) O P D. 0 E. OP (P ax D. 1 ) A bleaching, the bleaching process is as embodiment 1, and the bleaching technical conditions are respectively: O P Bleaching technical conditions, slurry concentration 16%, tower top pressure 0.4MPa, temperature 80°C, time 90min, relative to ...

Embodiment 3

[0074] (1) Cut the bamboo directly into 10-50mm long and 5-20mm wide, and use dry-wet combination method to prepare materials. Firstly, after dedusting by dust collector, then wash by grass washing machine and remove excess water, then enter the digester for pre-processing. Hydrolysis treatment, the liquid ratio is 1:1.0, the temperature is 100°C, and the holding time is 120min;

[0075] (2) After hydrolysis, the slurry is subjected to cooking hot alkali extraction, relative to the quality of the absolute dry material, the amount of alkali used is 12% (Na 2 O meter), lye concentration 50g / L (Na 2 O gauge), time 60min, temperature 120℃;

[0076] (3) The pulp after extraction is cooked by kraft method, relative to the quality of absolute dry material, the amount of alkali used is 10% (Na 2 O meter), the holding time is 120min, the temperature is 170℃, the liquid ratio is 1:6, and the vulcanization degree is 30%;

[0077] (4) O P D. 0 E. OP (P ax D. 1 ) A bleaching, the b...

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Abstract

The invention belongs to the field of paper pulp manufacturing and particularly relates to a method for utilizing a bamboo raw material to produce high-polymerization-degree dissolving pulp. The method is characterized by comprising the steps of material preparation, prehydrolysis, hot alkali extraction, alkaline method cooking, oxygen bleaching, bleaching and acid treatment and the like, and the clean pulping method for the high-polymerization-degree bamboo pulp solves the problems that existing production raw materials for the high-polymerization-degree dissolving pulp is sufficient, the technology falls behind, and pollution is severe, and the like. The polymerization degree of the manufactured bleached bamboo pulp is over 2000, the whiteness is over (90+ / -2)%ISO, a-cellulose is over 96%, the ash content is below 0.1%, the Fe ion is below 20ppm, S18 is below 3%, S10 is below 4%, and (S10-S18) is below 2%.

Description

technical field [0001] The invention belongs to the field of pulp making, and in particular relates to a clean pulping method for high-polymerization-degree bamboo pulp, which uses bamboo raw materials to produce high-polymerization-degree dissolving pulp. Background technique [0002] After entering the 21st century, with the rapid growth of domestic and foreign economies and the improvement of people's living standards, the demand for varieties of dissolving pulp is also increasing, not only the demand for viscose fibers (such as Lyocell fibers, modal fibers, rich and strong fibers, etc.), Moreover, the demand for products with high polymerization degree such as cellulose acetate, nitrocellulose and cellulose ether is increasing rapidly. [0003] At present, wood and cotton linters are mainly used to produce high-polymerization dissolving pulp at home and abroad. Due to the constraints of arable land and cost of cotton linters and wood, the output is limited. In addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C1/00D21C1/06D21C3/02D21C9/18D21C9/147D21C9/14
Inventor 杨玲李文俊王修朋于渭东陈广勇
Owner SICHUAN KANGQI BIOTECH CO LTD
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