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Novel method for flocculating papermaking black liquor lignin

A technology for papermaking black liquor and lignin is applied in the field of selectively degrading lignin in straw pulp and selectively precipitating papermaking black liquor lignin. The effect of accelerating the cycle and reducing the investment

Inactive Publication Date: 2010-12-29
上海纳欣生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In production, the flocculant has the following disadvantages: First, the flocculant itself is toxic. For example, the widely used polyacrylamide (PAM) is an organic polymer flocculant with a large molecular weight and ionicity, which is harmf

Method used

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  • Novel method for flocculating papermaking black liquor lignin
  • Novel method for flocculating papermaking black liquor lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Comparison of the effect of the flocculant formula used in the present invention and other formulas

[0018] The black liquor pulped with rice straw is the test water sample, and its original COD is 12000mg / L (COD is measured by potassium dichromate method). At room temperature, the above-mentioned black liquor was equally divided into 3 parts, each 100mL, the stirring speed was 50rpm / min, and potassium aluminum sulfate, ferrous sulfate, cationic polyacrylamide and chitin were added in sequence, so that the final concentrations of the above components were respectively 5%, 3%, 0.2% and 2%, adjust the pH value to 7.8, put it aside for 4 hours, take the supernatant to measure COD, the average COD is reduced to 327mg / L, and the COD removal rate is 97.3%. The other group used the same straw pulp raw material, added 0.1% polyaluminum chloride and 1% polyacrylamide, and aged for 4 hours according to the same pH and the same flocculation reaction time, the COD was 14...

Embodiment 2

[0019] The influence of embodiment 2 different pH values ​​on flocculation reaction

[0020] Take above-mentioned papermaking black liquor, stirring speed is 50rpm / min, add aluminum potassium sulfate, ferrous sulfate, cationic polyacrylamide and chitin successively, make the final concentration of above-mentioned composition be respectively 5%, 3%, 0.2% and 2%, flocculation was carried out under different pH conditions, the temperature of the water sample was room temperature, and after 6 hours of aging, the supernatant was taken to measure COD, and the test results were as follows figure 1 shown. As shown in the figure, pH has a great influence on the flocculation reaction, and the flocculation effect is the best when the pH is between 7.7 and 8.0, and the COD removal rate is about 95%.

Embodiment 3

[0021] The influence of embodiment 3 flocculation time on flocculation reaction

[0022] Take above-mentioned papermaking black liquor, stirring speed is 50rpm / min, add aluminum potassium sulfate, ferrous sulfate, cationic polyacrylamide and chitin successively, make the final concentration of above-mentioned composition be respectively 5%, 3%, 0.2% and 2%, after adjusting the pH value to 7.8, take the supernatant to measure COD every hour, the test results are as follows figure 2 shown. As shown in the figure, the flocculation reaction is basically completed in about 3 hours, and the continued aging after 3 hours has little effect on reducing COD.

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Abstract

The invention discloses a method for selectively precipitating papermaking black liquor lignin. The method specifically comprises the following steps of: filling papermaking black liquor into a reactor; adding 5 percent of aluminum potassium sulfate, 3 percent of ferrous sulfate, 0.2 percent of cationic polypropylene acylating ammonia amine, 2 percent of chitosan and 2 percent of attapulgite powder; regulating pH to be between 7.7 and 8.0; and precipitating the mixture for 3 hours, wherein the removing rate of COD in straw pulp reaches over 95 percent. The invention provides the novel method for precipitating the papermaking black liquor lignin. Compared with the conventional process, the method has the advantages of shorter time in a flocculation reaction, higher COD removing rate, higher lignin precipitation velocity and better decoloring effect.

Description

[0001] Technical field: The present invention relates to a method for selectively degrading lignin in straw pulp, specifically adopting a new flocculant formula to precipitate and recover lignin for papermaking black liquor; and using palygorskite powder to further purify the black liquor. technical background: [0002] Pulping pollution in the paper industry is the largest source of water pollution in my country. Among them, the waste liquor from pulping and cooking (commonly known as black liquor) accounts for more than 90% of the total pollution discharge. [0003] Raw materials such as straw for papermaking raw materials contain three parts: cellulose, lignin and hemicellulose (polysaccharides). Papermaking only uses cellulose (about 40%), and about 25% of which is wood. Elements and about 28% of hemicellulose and xylose, potassium, nitrogen, phosphorus and other substances are discarded with the black liquor. [0004] In recent years, domestic and foreign papermaking bla...

Claims

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Application Information

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IPC IPC(8): D21C11/00C02F1/52C02F1/28C02F1/66
Inventor 张舒羽顾莹
Owner 上海纳欣生物科技有限公司
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