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A kind of water-soluble lignin chelating agent and its preparation method and application

A technology of water-soluble lignin and chelating agent, applied in the field of water-soluble lignin chelating agent and preparation thereof, lignin chelating agent and preparation thereof, can solve the problems of poor dispersion effect and low chelating efficiency, and achieve good chelation The effect of high performance, chelation efficiency and good application prospect

Active Publication Date: 2021-10-08
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the macromolecule modified lignin dithiocarbamate chelating agent in the above-mentioned prior art has better stability effect on heavy metals and has realized advantages such as the reuse of biomass resources, it is water insoluble as a chelating agent. The solid product has poor dispersion effect when mixed with solid waste, resulting in low sequestration efficiency, thus limiting its application in the field of solid waste treatment

Method used

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  • A kind of water-soluble lignin chelating agent and its preparation method and application
  • A kind of water-soluble lignin chelating agent and its preparation method and application
  • A kind of water-soluble lignin chelating agent and its preparation method and application

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Embodiment 1

[0049] This embodiment provides a water-soluble lignin chelating agent, the water-soluble lignin chelating agent includes the following preparation raw materials in parts by weight: 10 parts of alkaline lignin, 15 parts of formaldehyde, 35 parts of amines, 50 parts of carbon disulfide share. Its preparation method is:

[0050] (1) Weigh 1.0000g of lignin into a 500mL three-neck flask, add 250mL of pure water to mix, stir until completely dissolved, and obtain an alkaline lignin aqueous solution;

[0051] (2) Adjust the pH value of the alkaline lignin aqueous solution obtained in step (1) to 11 with 1mol / L sodium hydroxide, add anhydrous ethylenediamine and formaldehyde solution dropwise, and carry out amination reaction at 90°C 5h (this process uses a condensing reflux device for cooling reflux);

[0052] (3) Adjust the pH value of the final reaction system obtained in step (2) to 10, then slowly add carbon disulfide to it for mixing, and stir at 25° C. for esterification fo...

Embodiment 2

[0055] This embodiment provides a water-soluble lignin chelating agent, the water-soluble lignin chelating agent includes the following preparation raw materials in parts by weight: 10 parts of alkaline lignin, 11 parts of formaldehyde, 30 parts of amines, 40 parts of carbon disulfide share. Its preparation method is:

[0056] (1) Weigh 1.0000g of lignin into a 500mL three-neck flask, add 250mL of pure water to mix, stir until completely dissolved, and obtain an alkaline lignin aqueous solution;

[0057] (2) Adjust the pH value of the alkaline lignin aqueous solution obtained in step (1) to 13 with 1mol / L calcium hydroxide, add diethylenetriamine solution and formaldehyde solution dropwise, and carry out amination reaction at 80°C 6h (this process uses a condensing reflux device for cooling reflux);

[0058] (3) Adjust the pH value of the final reaction system obtained in step (2) to 9.5, then slowly add carbon disulfide to it for mixing, and stir at 20°C for esterification ...

Embodiment 3

[0061] This embodiment provides a water-soluble lignin chelating agent, the water-soluble lignin chelating agent includes the following preparation raw materials in parts by weight: 10 parts of alkaline lignin, 20 parts of formaldehyde, 40 parts of amines, 60 parts of carbon disulfide share. Its preparation method is:

[0062] (1) Weigh 1.0000g of lignin into a 500mL three-neck flask, add 250mL of pure water to mix, stir until completely dissolved, and obtain an alkaline lignin aqueous solution;

[0063] (2) Use 1mol / L sodium hydroxide to adjust the pH value of the alkaline lignin aqueous solution obtained in step (1) to 12, add anhydrous ethylenediamine and formaldehyde solution dropwise, and carry out amination reaction at 90°C 4h (this process uses a condensing reflux device for cooling reflux);

[0064] (3) Adjust the pH value of the final reaction system obtained in step (2) to 10.5, then slowly add carbon disulfide to it for mixing, and stir at 30° C. for esterificatio...

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Abstract

The present invention relates to a water-soluble lignin chelating agent and its preparation method and application. The water-soluble lignin chelating agent comprises the following preparation raw materials in parts by weight: 10 parts of alkaline lignin, 11-20 parts of aldehydes , 30-40 parts of amines, 40-60 parts of carbon disulfide. The water-soluble lignin chelating agent involved in the present invention has very high sulfur content, and it has good chelating performance to heavy metals; in addition, the water solubility of this water-soluble lignin chelating agent is very good, and it overcomes existing Most of the chelating agents in the technology are water-insoluble solid products. In the state of solution, when mixed with heavy metal solid waste, the dispersing effect is good, so that the chelating efficiency is very high. Therefore, the water-soluble lignin chelating agent is very useful in the field of solid waste treatment. Very good application prospects.

Description

technical field [0001] The invention belongs to the technical field of chelating agent synthesis, and in particular relates to a lignin chelating agent and its preparation method and application, in particular to a water-soluble lignin chelating agent and its preparation method and application. Background technique [0002] With the rapid development of the economy, the problem of environmental pollution has also become increasingly serious. The large amount of emissions from industries such as metallurgy, mining, chemical industry and electronics has resulted in more and more solid waste containing heavy metals, such as waste incineration fly ash, sludge, various slag and polluted soil. Heavy metals cannot be degraded by microorganisms in the natural environment, but they can be enriched in the roots, stems or leaves of plants through migration, and enter the human body through the food chain, which seriously threatens human health. Therefore, the current heavy metal treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 童立志胡清王峰唐一胡滨韦黎华
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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