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Treating method for pulping black liquor

A technology for pulping black liquor and treatment methods, which is applied in the regeneration of lye, can solve the problems of large acid consumption, and achieve the effects of avoiding secondary pollution, reducing production costs, and avoiding waste of acid

Inactive Publication Date: 2013-03-06
秦才东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The processing method of the pulping black liquor of the present invention is to utilize the waste resource of the alkaline black liquor itself (without utilizing other alkaline substances such as lime) to neutralize the acid-containing aqueous solution produced during the acid analysis black liquor. Diaphragm or filter cloth or filter screen, a new process for neutralizing pulping black liquor and acid-containing aqueous solution. The special advantage of this method is that it can avoid the traditional method of directly adding black liquor or mid-stage water to neutralize acid-containing aqueous solution Part of the lignin is brought into the acid-containing aqueous solution to form a new lignin pollution problem, and various high value-added by-products can be separated from the pulping black liquor, such as lignin, white carbon black, salt, sugar, recycled used water, etc., to improve the economic feasibility and industrial practicability of the process, especially to solve the problem of large acid consumption in the traditional acid analysis process, and to solve the problem that the acid consumed in the traditional acid analysis process is not fully used The problem of extracting lignin in black liquor, while reducing production costs, avoiding secondary pollution of acidic wastewater, such as avoiding the waste of acid and the cost of lime itself when using lime to neutralize the wastewater generated by acid precipitation in the traditional method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Use stainless steel wire mesh to cut and roll out a cylindrical barrel with a diameter of 20 cm and a height of 1 meter. The cylindrical surface of the barrel is tightly surrounded by a layer of 300-mesh filter cloth. That is to play the role of sealing, but also leave the black liquor import and export. Then use stainless steel wire mesh to bend two U-shaped frames, one large and one small. The small U-shaped frame is 50 cm wide, 30 cm high, and 1 meter long; the large U-shaped frame is 80 cm wide and 30 cm high. 1 meter in length. The two U-shaped frames are surrounded by 100-mesh filter cloth, and the bottom of the U-shaped frame is paved with plastic film (the purpose is to prevent the black liquor from pulping from having a large proportion, and it is easy to use the bottom of the frame as a channel to directly spread to the far in acid-containing aqueous solution). Place the above-mentioned cylindrical barrel in the middle of the small U-shaped frame, and use st...

Embodiment 2

[0021]Under normal temperature and pressure, take commercially available (Jiangsu Xinyi sales) alkaline lignin as an example, dissolve 1 kg of alkaline lignin in 10 liters of water to obtain lignin aqueous solution (simulated as pulping black liquor), or directly Pulping black liquor from an alkaline pulp mill, or 100 kg of rice straw is chopped and immersed in 300 kg of aqueous solution dissolved with 10 kg of caustic soda (the container is a stainless steel water tank), and after soaking and stirring intermittently for one day, the pulping black liquor is extracted ; After removing the solid impurities in the black liquor by filtering with 1000 mesh filter cloths, then use the sulfuric acid or other mineral acids (such as hydrochloric acid, phosphoric acid or nitric acid or sulfurous acid) with a concentration of 10wt% (or any other concentration) under stirring normal pressure , from economical considerations, sulfuric acid or hydrochloric acid is preferably used) aqueous so...

Embodiment 3

[0030] In the method of separating the acid-containing aqueous solution and the pulping black liquor using a diaphragm in the above-mentioned embodiment 1, because the filter holes in the diaphragm are small, the migration resistance of the reactants is large, and the neutralization reaction time is therefore longer. Under laboratory conditions, one liter of black liquor containing 10% commercially available lignin powder preparation, with 1000 mesh filter cloth as diaphragm material, in diaphragm area about 100 square centimeters, with 1 liter of acidic aqueous solution (containing sulfuric acid 10wt%) In contact with each other, in a static state without stirring, it takes about 2 days to completely acidify and neutralize the black liquor to fully analyze lignin. In order to speed up the reaction speed, a 400-mesh filter was used as the diaphragm material. Although the neutralization reaction speed was accelerated, it can be seen that some flocculent lignin appeared in the ac...

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Abstract

The invention relates to a treating method for pulping black liquor. According to the invention, a novel process of separating the pulping black liquor from an aqueous solution containing acid by using a diaphragm is utilized, wherein the diaphragm comprises a cation permselective membrane, a filter cloth or a filter screen, a variety of by products with a high added-value such as lignin, white carbon black, salt, sugar, reusable water and the like are separated from the pulping black liquor, so economic feasibility and industrial applicability of process flow are improved, particularly the problem of great consumption of acid in a traditional acid precipitation method is overcome, production cost is reduced, and secondary pollution of acidic waste water is avoided, e.g., waste of acid and cost of lime during neutralization of waste water produced in acid precipitation by using lime in a traditional method are avoided; moreover, the purpose of economical and effective neutralization treatment of acidic waste water without bringing of new pollutants is achieved.

Description

technical field [0001] The present invention relates to a processing method of pulping black liquor, which relates to the extraction of lignin by acid precipitation treatment of black liquor, and the use of black liquor to neutralize the acid-containing aqueous solution (including other industrial waste acid solutions or newly prepared Acid solution) diaphragm neutralization treatment method to solve the problem of black liquor pollution in pulping enterprises and the secondary pollution of acid-containing aqueous solution after black liquor acid analysis, and to obtain high value-added products. Background technique [0002] In the process of alkaline pulping, including chemical pulp, semi-chemical pulp or chemical mechanical pulp, the main chemical reaction is that caustic soda reacts with lignin in raw materials to form alkali lignin, which dissolves in lye. The waste liquid obtained from cooking contains a large amount of degradation products such as lignin and hemicellu...

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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