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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, applied in pulp bleaching, cellulose raw material pulping, pulp dehydration, etc., can solve the problems of insufficient production raw materials, pollution, backward technology, etc., achieve the recovery of black liquor alkali and reduce environmental pollution , the effect of strong market competitiveness

Inactive Publication Date: 2010-06-23
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

[0034] Cut the raw material of asparagus directly into 10-50mm length, and prepare the material by dry method, that is, after dedusting by the dust collector, send it to the digester for sulfuric acid prehydrolysis treatment. The mass ratio of asparagus and aqueous solution is 1:20, and the time is 60 minutes. After the pre-hydrolysis is completed, the tablet is sprayed into the spray pot, washed with water until neutral, and the washed filtrate is treated by the water treatment system of the pulping workshop. Afterwards, it is reused as a pre-hydrolyzed solution, and the tablet is added to the cooking solution and sent to the secondary digester for alkaline cooking.

[0035]Secondary cooking adopts NaOH-green oxygen method. Green oxygen is a polymer compound with strong wetting and penetrating ability, which can promote the lye to quickly wet the fiber surface and penetrate into the interior. quality, the amount of NaOH is 12%, the amount of green oxygen is 0.02%, the mass ra...

Embodiment 2

[0039] Directly cut the raw material of asparagus grass into 10-50mm length, and prepare the material by wet method, that is, after being washed by a grass washing machine, it is 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°C, the time is 180min, and then it is sprayed into the spray pot, washed with water until neutral, the waste liquid is treated by the water treatment system of the pulping workshop and reused as water for washing grass, and the tablet is added to the cooking liquid and sent to the secondary secondary cooker.

[0040] The secondary cooking adopts ammonia water-anthraquinone method, relative to the quality of the dry tablet, the amount of ammonia water is 30%, anthraquinone is 0.5%, the mass ratio of tablet to aqueous solution is 1:6, the temperature is 170°C, and the time is 30min. After cooking, Spray the slurry into th...

Embodiment 3

[0044] The raw material of asparagus is directly cut into 10-50mm length, and the dry and wet method is used to prepare the material, that is, the dust is removed by the dust collector, and then washed by the grass washing machine, and the washed material is sent to the digester for hydrochloric acid pre-hydrolysis treatment. The amount of dry raw material is 2%, the temperature is 90°C, the mass ratio of tablet to aqueous solution is 1:8, and the time is 10min. After treatment by the water treatment system in the pulping workshop, it is reused as a pre-hydrolyzed liquid, and the pulp is added to the cooking liquid and sent to the secondary digester.

[0045] The secondary cooking adopts the alkaline sodium sulfite-anthraquinone method, with respect to the quality of the dry tablet, the amount of NaOH is 5%, the amount of sodium sulfite is 12%, the amount of anthraquinone is 1%, and the mass ratio of the tablet to the aqueous solution is 1:6 , the temperature is 160°C, and the...

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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 energy saving 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 coal...

Claims

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Application Information

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IPC IPC(8): D21C3/00D21C5/00D21C9/02D21C9/10D21C9/18
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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