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Treatment method for pulping black liquid and application method for product of pulping black liquid

A technology for pulping black liquor and a treatment method, which can be used in the regeneration of alkali liquor and other directions, and can solve problems such as black liquor pollution

Inactive Publication Date: 2013-04-24
秦才东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The processing method of pulping black liquor of the present invention and the application method of product thereof, one of main purpose is to solve black liquor pollution problem at low cost, promptly utilizes the calcium ion (or magnesium sulfate) in the calcium sulfate salt of cheap low cost slightly soluble Magnesium ions in black liquor) react with sodium lignin, sodium organic acid (such as sodium fatty acid, sodium pectate, sodium resinate, sodium sugarate, sodium uronate, etc.), sodium silicate to produce salting-out effect , in addition to the corresponding generation of sodium sulfate soluble in aqueous solution, it also corresponds to the generation of water-insoluble calcium lignin, calcium organic acid, calcium silicate, etc., that is, adding salts to the black liquor to dissolve in the pulping black liquor The lignin, pectin, organic acid, silicic acid, etc. form water-insoluble salts and precipitate, so as to achieve the purpose of separating from the water in the black liquor, and obtain waste water containing no or a small amount of lignin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Under normal temperature and pressure, take by weighing 50 grams of commercially available alkaline lignin dry powder (sales in Xinyi, Jiangsu) and put it into a beaker, add water to 1000 grams, and prepare simulated pulping black liquor containing about 5% solids. Its pH is about 13. Prepare saturated calcium sulfate (CaSO4, prepared by putting commercially available gypsum powder into water) aqueous solution (water is drinking tap water), slowly add the saturated calcium sulfate aqueous solution into the simulated pulping black liquor, and flocculent precipitation can be seen (according to the principle of chemical equilibrium, the precipitates are calcium salts of calcium lignin and partially water-insoluble organic acids, such as calcium pectate, calcium fatty acid, calcium resinate, etc.), add 200 milliliters of calcium sulfate aqueous solution and fully After stirring, let the resulting mixed solution stand for about 1 hour. It can be seen that the upper layer of ...

Embodiment 2

[0010] Chopped 300 grams of straw and put it into a stainless steel heating pot, put 30 grams of alkali and 1000 grams of water into it, heat it to 100°C, keep it warm for 1 hour, and then cool down naturally. Take out 200 milliliters of black liquor in the pot, add the saturated aqueous solution of calcium sulfate according to the method in embodiment 1, after precipitation filtration separation, can obtain the solid or floc mixture that mainly contains lignin calcium, calcium silicate, the separated waste water Ease of biochemical treatment. After drying and crushing the obtained mixture of calcium lignin and / or calcium silicate (or using the method of crushing lignin by salt crystallization provided by the author in the prior application PCT / CN2011 / 073159) to crush calcium lignin and calcium silicate Calcium silicate mixture) is used to mix and match with raw materials for the production of silicate glass and Portland cement to meet product component requirements, and play ...

Embodiment 3

[0013] In order to simulate the treatment of black liquor produced by pulping raw materials with high pectin content, 1000 milliliters of black liquor pulped from cotton stalks or green sandalwood bark raw materials produced in the year were taken, and an aqueous solution of calcium sulfate was added according to the method in Example 1. When the solid content of black liquor is higher (such as reaching 20%), or because cotton stalks and green sandalwood bark contain more pectin, the content of pectin in black liquor is higher, or because the solid content in black liquor Because of the high content of calcium sulfate, after adding calcium sulfate according to the method in Example 1, the material precipitated in the black liquor is thick, and forms a relatively stable colloidal state with the black liquor, and the precipitation is slow (it can be seen that the precipitate formed after standing for about 3 hours) Aggregation), is not conducive to filtration separation, so it is...

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PUM

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Abstract

The invention relates to a treatment method for pulping black liquid and an application method for a product of the pulping black liquid, and belongs to the field of alkaline pulping and cellulose and hemicellulose pulp extraction. Lignin and / or pectin and / or silicate which are smelted in the black liquid are converted into lignin calcium (magnesium) salt and / or pectate calcium (magnesium) salt and / or calcium (magnesium) silicate which are not smelted in water by using calcium sulfate or magnesium sulfate salt and can be separated out of the black liquid; due to filtration and separation, the black liquid in a pulping papermaking industry can be treated with low cost; and moreover, various useful chemicals can be obtained.

Description

technical field [0001] The invention relates to a processing method of pulping black liquor and an application method of its products, especially in the fields of alkaline pulping and extraction of cellulose and hemicellulose pulp, involving salting-out lignin, etc., using calcium sulfate to dissolve Conversion of lignin and / or pectin and / or silicate in black liquor to water-insoluble calcium salt of lignin and / or water-insoluble calcium salt of pectate and / or water-insoluble calcium silicate , and precipitated from the black liquor, and then separated by filtration to solve the problem of black liquor treatment in the pulp and paper industry at low cost, and at the same time obtain various useful chemicals. Background technique [0002] In the alkaline pulping process such as caustic soda method and sulfate method, including chemical pulp, semi-chemical pulp or chemical mechanical pulp, the main chemical reaction is that caustic soda and / or sodium sulfide react with lignin ...

Claims

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Application Information

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IPC IPC(8): D21C11/04C08H7/00
Inventor 秦才东
Owner 秦才东
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