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
CN110550797BActive Publication Date: 2021-03-30XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN UNIV
Publication Date
2021-03-30

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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