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A method for efficient fractionation and separation of organic matter in pulping yellow liquor

A technology for grading separation and organic matter, applied in chemical instruments and methods, water pollutants, multi-stage treatment of water/sewage, etc., can solve the problem of not realizing targeted classification and utilization, achieve the concept of zero-emission environment-friendly industry, and achieve high efficiency The effect of fractionation separation and good precipitation recovery

Active Publication Date: 2021-03-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two methods have not achieved the targeted classification and utilization of all components of waste liquid components.

Method used

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  • A method for efficient fractionation and separation of organic matter in pulping yellow liquor
  • A method for efficient fractionation and separation of organic matter in pulping yellow liquor
  • A method for efficient fractionation and separation of organic matter in pulping yellow liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 1 kg (dry weight) of fiber plant raw material, collect yellow liquid after cooking and pulping by solid alkali active oxygen method. Sampling was performed to determine that the dry weight of the yellow liquid accounted for about 6.15% of the total liquid weight. Add the yellow liquid into a methanol solvent with a volume ratio of 5 times, and after mixing evenly, a white precipitate is precipitated. The white precipitate is a large-molecular aliphatic organic matter and a small-molecule organic acid salt. Filter and wash with methanol, dry, and weigh its weight to account for the liquid. 81.3% of the total dry weight. The mixed liquid is rectified, the solvent methanol is recovered from the top of the tower, the methanol can be reused, and the residual aqueous solution is collected in the tower kettle. Add hydrochloric acid solution to the kettle liquid to adjust the pH to 1.02, and precipitate a light yellow precipitate, which is a macromolecular aromatic organ...

Embodiment 2

[0030] Weigh 1 kg (dry weight) of fiber plant raw material, collect yellow liquid after cooking and pulping by solid alkali active oxygen method. Sampling was performed to determine that the dry weight of the yellow liquid accounted for about 6.15% of the total liquid weight. Add the yellow liquid into a tetrahydrofuran solvent with a volume ratio of 8 times. After mixing evenly, a white precipitate is precipitated. The white precipitate is a large-molecular aliphatic organic matter and a small-molecule organic acid salt. Filter and wash with tetrahydrofuran, dry, and weigh its weight in the liquid. 81.4% of the total dry weight. The mixed liquid is rectified, the solvent tetrahydrofuran is recovered from the top of the tower, and the tetrahydrofuran can be reused, and the residual aqueous solution is collected in the tower kettle. Sulfuric acid solution is added to the kettle liquid to adjust the pH to 0.72, and a light yellow precipitate is precipitated. Part of the precip...

Embodiment 3

[0032] Weigh 1 kg (dry weight) of fiber plant raw material, collect yellow liquid after cooking and pulping by solid alkali active oxygen method. Sampling was performed to determine that the dry weight of the yellow liquid accounted for about 6.15% of the total liquid weight. Add the yellow liquid to the acetaldehyde solvent with a volume ratio of 2 times, and after mixing evenly, a white precipitate is precipitated. The white precipitate is a large-molecular aliphatic organic matter and a small-molecule organic acid salt. Filter and wash with acetaldehyde, dry, and weigh it. Accounting for 68.5% of the total dry weight of the liquid. The mixed liquid is rectified, the solvent acetaldehyde is recovered from the top of the tower, and the acetaldehyde can be reused, and the residual aqueous solution is collected in the bottom of the tower. Add formic acid solution to the kettle liquid to adjust the pH to 1.94, and a light yellow precipitate is precipitated. Part of the precipi...

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Abstract

The invention provides a method for high-efficiency fractional separation of organic matters in pulping yellow liquid, wherein the method comprises the steps: 1) stewing fiber plants by a solid alkaliactive oxygen pulping method to obtain pulp and pulping yellow liquid; 2) adding the pulping yellow liquid in the step 1) into an organic solvent, and separating out a white precipitate I; (3) recovering the white precipitate I in the step (2) in a filtering manner, recovering the organic solvent in the filtrate in a rectifying manner, and recovering and repeatedly utilizing the rectified organicsolvent; 4) adding an acid into the kettle liquid in the step 3) to adjust the pH value to 2.0 or below, and separating out a faint yellow precipitate II; and 5) washing the white precipitate I obtained in the step 2) with an organic solvent for further separation and refinement, and washing the faint yellow precipitate II obtained in the step 4) with water, and taking the product as high-puritylignin for subsequent use. By applying the method, fractional precipitation of the pulping yellow liquid can be realized, and a good precipitation recoquite effect is achieved.

Description

technical field [0001] The invention relates to the field of pulping waste liquid treatment, in particular to a method for efficient fractionation and separation of organic matter in pulping yellow liquid. Background technique [0002] With the increasing environmental protection requirements of the chemical industry in China, the wastewater treatment of the pulp and paper industry has attracted widespread attention. At present, the treatment of pulping waste liquid is still a major cost item in the pulp and paper industry. Extensive waste liquid treatment methods, such as concentrated incineration, will be gradually replaced by more refined and intensive technologies in future industrial technologies due to their unsatisfactory economic and environmental benefits. Patent CN105332310A discloses a method of separating organic components in diethanolamine pulping waste liquid by means of membrane filtration such as ultrafiltration, and feeding and circulating the remaining li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C08H7/00C02F101/32C02F101/34
CPCC02F1/04C02F1/26C02F1/54C02F9/00C02F2101/32C02F2101/34C02F2103/28C08H6/00
Inventor 曾宪海丁宁李嘉臣唐兴孙勇林鹿
Owner XIAMEN UNIV
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