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Efficient and clean puling and bleaching method dissolving alpha-pulp by Chinese alpine rush

A technology of asparagus and dissolving pulp, which is applied in pulp bleaching, cellulose raw material pulping, pulp dehydration, etc., to achieve strong market competitiveness, high production efficiency, and the effect of realizing black liquor alkali recovery

Inactive Publication Date: 2011-08-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of insufficient raw materials for pulp production, backward technology and serious pollution, and provide a kind of asparagus that uses abundant resources as raw material. The process of producing dissolving pulp by adopting modern clean pulping and papermaking technologies such as oxygen delignification and hydrogen peroxide bleaching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Cut the Altarsia raw materials directly into lengths of 10-50mm, and prepare the materials by dry method, that is, after the dust is removed by the dust collector, they are sent to the digester for sulfuric acid pre-hydrolysis. The amount of sulfuric acid to the absolutely dry raw materials is 1%, and the temperature is 60℃. The mass ratio of Altarsia to the aqueous solution is 1:20, and the time is 60min. After the pre-hydrolysis is completed, spray the material into the spray pot and rinse with water to neutrality. The washed filtrate is processed by the water treatment system of the pulping workshop After being reused as the pre-hydrolyzed liquid, the chips are added to the cooking liquid and sent to the secondary digester for alkaline cooking.

[0037] The secondary cooking uses the NaOH-green oxygen method. Green oxygen is a polymer compound with strong wetting and penetrating capabilities. It can promote the lye to quickly wet the fiber surface and penetrate into the ...

Embodiment 2

[0041] Cut the alpine grass raw materials directly into lengths of 10-50mm, and prepare the materials by wet method, that is, after being washed by the grass washer, they are sent to the digester for pre-hydrolysis treatment with clean water, that is, no acid is added, and the mass ratio of the tablet to the aqueous solution is 1: 12. The temperature is 160℃ for 180min, and then sprayed into the spray pot, rinsed with water to neutrality, the waste liquid is treated by the water treatment system of the pulping workshop and then reused as grass washing water, and the chips are added to the cooking liquid and sent to the second Sub-cooker.

[0042] The secondary cooking adopts the ammonia-anthraquinone method. Relative to the mass of the absolutely dry tablet, the amount of ammonia is 30%, the anthraquinone is 0.5%, the mass ratio of the tablet to the aqueous solution is 1:6, the temperature is 170°C, and the time is 30min. After the cooking is completed, The slurry is sprayed to t...

Embodiment 3

[0046] Cut the Alpine grass raw materials directly into lengths of 10-50mm, and prepare the materials by dry and wet methods, that is, the dust is removed by the dust collector, and then washed by the grass washer. After washing, the material is sent to the digester for hydrochloric acid pre-hydrolysis treatment. The amount of dry raw materials is 2%, the temperature is 90°C, the mass ratio of the tablet to the aqueous solution is 1:8, and the time is 10 minutes. After the pre-hydrolysis is completed, the tablet is sprayed into the spray pot, rinsed with water to neutral, and the waste liquid is After being treated by the water treatment system in the pulping workshop, it is reused as the pre-hydrolyzed liquid, and the slurry is added to the cooking liquid and sent to the secondary digester.

[0047] The secondary cooking adopts the alkaline sodium sulfite-anthraquinone method. The amount of NaOH is 5%, the amount of sodium sulfite is 12%, the amount of anthraquinone is 1%, and th...

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Abstract

The invention discloses an efficient and clean puling and bleaching method dissolving alpha-pulp by Chinese alpine rush. The method comprises the steps of stock preparation, prehydrolysis, alkaline cooking, black liquor extraction, closed screening, total chlorine free bleaching, bleached pulp treatment and the like, namely, adding stock blank after prehydrolysis into a continuous digester to carry out alkaline cooking; adopting a vacuum pulp washer to extract black liquor from sizing agent, sealing and screening, then washing and concentrating the sizing agent through a vacuum filter, wherein the mass concentration of pulp after concentration is larger than or equal to 10%; adding NaOH solution and magnesium salt protective agent in concentrated pulp, then sequentially passing through a medium concentration pump and a medium concentration mixer to enter an upflow type bleaching tower to carry out total chlorine free bleaching. In the invention, the productive process is continuous, and non chlorine bleaching agent is utilized in the production, waste water can flow reversely for reuse and does not contain toxic and harmful adsorbable organic chloride AOX, thereby realizing energysaving and emission reduction, cleaning and bleaching of alpha-pulp production, improving the additional value of Chinese alpine rush, thus the method can be promoted and utilized industrially.

Description

technical field [0001] The invention relates to a high-efficiency and clean preparation method of asparagus dissolving pulp. The produced asparagus dissolving pulp has excellent performance and can be widely used in food, medicine, textiles, military industry and other related industries. Background technique [0002] As an important raw material for chemical fibers, dissolving pulp is widely used in the national economy and has a large social demand. The shortage of cellulose is an international problem, how to develop new cellulose resources has become a very practical and urgent directional issue. At the same time, the process used for pulp basically follows the traditional or even relatively primitive pulping and papermaking technology, which seriously pollutes the environment. There are two main sources of pollution: [0003] One is pre-hydrolysis and cooking black liquor, which has very high COD and chroma. The current practice of enterprises is to send it to the coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21C9/10D21C9/18D21C3/00D21C9/02
Inventor 徐峻陈克复李军吴会敏莫立焕杨仁党
Owner SOUTH CHINA UNIV OF TECH
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