Synthetic method of mixed heavy metal trapping agent

A technology for a heavy metal scavenger and a synthesis method, which is applied in the direction of organic chemistry and the like, can solve the problems of inability to synthesize mixed thioaminocarboxylates, pollute the on-site environment, and uneven mixing, so as to avoid uneven mixing and achieve good stabilization effects. , the effect of low energy consumption

Inactive Publication Date: 2019-12-13
江苏乐尔环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, it is currently impossible to synthesize mixed thioaminocarboxylates using conventional methods. The mixed thioaminocarboxylates in actual use are artificially mixed with the prepared single thioaminocarboxylates by mechanical stirring, and then used
However, there is a defect of uneven mixing, and the operation is complicated, and there is a risk of polluting the on-site environment during the mixing process

Method used

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  • Synthetic method of mixed heavy metal trapping agent

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Effect test

Embodiment 1

[0025] A kind of synthetic method of hybrid heavy metal scavenger comprises the following steps: comprising the following steps:

[0026] S1: Sampling: Take carbon disulfide, caustic alkali and organic mixed amine for use, the molar ratio of organic mixed amine, caustic alkali and carbon disulfide is 1:1:4, and the organic mixed amine is dimethylamine, diethylamine and ethylmethyl Diamine, organic mixed amine accounts for 30% of the total mass, the caustic is in powder form, which is convenient for reaction, and the caustic is sodium hydroxide;

[0027] S2: Synthesis: Mix carbon disulfide, caustic alkali and organic mixed amine by carbon disulfide excess solvent method, the temperature is 0°C, and the time is 2h;

[0028] S3: Carbon disulfide recovery: The excess carbon disulfide synthesized in step S2 is recovered by step-by-step distillation under normal pressure first and then under reduced pressure. The normal pressure distillation temperature is 70°C.

Embodiment 2

[0030] A kind of synthetic method of hybrid heavy metal scavenger comprises the following steps: comprising the following steps:

[0031] S1: Sampling: Take carbon disulfide, caustic alkali and organic mixed amine for use, the molar ratio of organic mixed amine, caustic alkali and carbon disulfide is 1:1:6, organic mixed amine is dimethylamine, diethylamine, ethylmethyl Diamine, diethylamine, propylethyldiamine and diethylamine, organic mixed amines account for 50% of the total mass, the caustic is flake, which is convenient for reaction, and the caustic is potassium hydroxide;

[0032] S2: Synthesis: Using carbon disulfide excess solvent method, carbon disulfide, caustic alkali and organic mixed amine are mixed and reacted at a temperature of 40°C for 6 hours;

[0033] S3: Recovery of carbon disulfide: The excess carbon disulfide synthesized in step S2 is recovered by step-by-step distillation under normal pressure first and then under reduced pressure. The normal pressure di...

Embodiment 3

[0035] A kind of synthetic method of hybrid heavy metal scavenger comprises the following steps: comprising the following steps:

[0036] S1: Sampling: Take carbon disulfide, caustic alkali and organic mixed amine for use, the molar ratio of organic mixed amine, caustic alkali and carbon disulfide is 1:1:5, and the organic mixed amine is diethylamine, ethylmethyldiamine, diethylamine, Ethylamine and propylethyldiamine, organic mixed amines account for 40% of the total mass, the caustic is granular, which is convenient for reaction, and the caustic is sodium hydroxide;

[0037] S2: Synthesis: Using carbon disulfide excess solvent method, carbon disulfide, caustic alkali and organic mixed amine are mixed and reacted at a temperature of 20°C for 4 hours;

[0038] S3: Carbon disulfide recovery: The excess carbon disulfide synthesized in step S2 is recovered by step-by-step distillation under normal pressure first and then under reduced pressure. The normal pressure distillation te...

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Abstract

The invention discloses a synthetic method of a mixed heavy metal trapping agent. The method comprises the following steps: 1, sampling, wherein preparing and mixing carbon disulfide, caustic alkali and an organic mixed amine for later use, S2, synthesizing, wherein carrying out mixed reaction of carbon disulfide, caustic alkali and the organic mixed amine by using a carbon disulfide excessive solvent method, and S3, carbon disulfide recycling, wherein distilling and recovering excessive carbon disulfide synthesized in the step S2 step by step in a normal-pressure-first and reduced-pressure-second manner. Compared with the prior art, the method has the advantages that complex steps of manual mixing are not needed, the defect of non-uniform mixing is avoided, high temperature and high pressure are not needed, energy consumption is low, process is simple and reliable chelating and precipitating effects on almost all all transition-state heavy metals are achieved, and the stabilization effect on heavy metals in fly ash is better than that of single thioamino carboxylates.

Description

technical field [0001] The invention relates to the technical field of synthesis of organic mixed amines, in particular to a synthesis method of a mixed heavy metal scavenger. Background technique [0002] Municipal solid waste is a mixed waste with complex composition, which contains a considerable amount of heavy metals. When the incineration method is used to treat municipal solid waste, a large number of volatile elements such as lead, cadmium, zinc, mercury, chromium and other heavy metals volatilize into the flue gas due to high temperature, and are finally enriched in the fly ash. Therefore, the fly ash of waste incineration has great harm to the environment and human body. It is necessary to stabilize the heavy metals in the fly ash so that it can meet the landfill standard and then carry out centralized treatment. [0003] The fly ash solidification and stabilization technologies mainly include cement solidification, chemical stabilization, asphalt solidification, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C333/16A62D3/33A62D101/43A62D101/08
CPCA62D3/33A62D2101/08A62D2101/43C07C333/16
Inventor 王涛徐亚军景奇超
Owner 江苏乐尔环境科技股份有限公司
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