Method for recovering dimethylamine from nicosulfuron waste water

A technology for nicosulfuron-methyl and dimethylamine, which is applied in the field of separation and purification of dimethylamine, can solve problems such as increased recovery cost, unfavorable environmental protection, etc., and achieves the effects of reduced production cost, reduced adverse impact and obvious economic benefits

Active Publication Date: 2015-03-11
ANHUI KELIHUA CHEM
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method solves the problem of recovery and reuse of dimethylamine, the organic solvent toluene is needed in the recovery proces...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] In a 1000ml four-necked bottle equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a ground glass tube connected to a porous washing bottle, add 313.8 g of nicosulfuron wastewater with a dimethylamine hydrochloride content of 37.1%, and stir , add 210.6g of 31% sodium hydroxide solution dropwise, after the dropwise addition, ensure that the pH value is ≥ 13, quickly raise the temperature to 60°C, and then raise the temperature to 90°C at a rate of 10°C every 0.5h, and keep the temperature for 1h, no two When the methylamine distilled off, the reaction was terminated, and the pH value was measured to be 11-12. The distilled dimethylamine enters the first-level wash bottle for washing and adsorption. The first-level wash bottle contains 103g of water. After the first-level wash, the gas enters the second-level wash bottle. Aqueous solution of dimethylamine. The content of dimethylamine in the first-level washing bottle is 33.9%, and the equivale...

Embodiment 2

[0032] In a 1000ml four-necked bottle equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a ground glass tube connected to a porous washing bottle, add 313.8 g of nicosulfuron wastewater with a dimethylamine hydrochloride content of 37.1%, and stir , add 210.6g of 31% sodium hydroxide solution dropwise, after the dropwise addition, ensure that the pH value is ≥ 13, quickly raise the temperature to 60°C, and then raise the temperature to 90°C at a rate of 10°C every 0.5h, and keep the temperature for 1h, no two When the methylamine distilled off, the reaction was terminated, and the pH value was measured to be 11-12. The distilled dimethylamine enters the first-level wash bottle for washing and adsorption. The first-level wash bottle contains 81g of water. After the first-level wash, the gas enters the second-level wash bottle. The second-level wash bottle contains 82g of water. Aqueous solution of dimethylamine. The content of dimethylamine in the fi...

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Abstract

The invention discloses a method for recovering dimethylamine from nicosulfuron waste water. The method comprises the following steps: mixing the nicosulfuron waste water containing dimethylamine hydrochloride with a sodium hydroxide aqueous solution, after sufficient reaction, heating for distilling so as to obain dimethylamine, after washing with water and adsorbing for multiple times, obtaining a recovered dimethylamine agueous solution. The concentration of the recovered dimethylamine agueous solution can reach 30%-50%, and the dimethylamine agueous solution can be used for producing nicosulfuron. The method for recovering the dimethylamine, disclosed by the invention, is simple, and convenient to operate, so that the technical problem of recovering the dimethylamine from the nicosulfuron waste water containing the dimethylamine hydrochloride is solved, and obvious economic benefits and social benefits are achieved. The method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of separation and purification of dimethylamine, and relates to a method for recovering chemical and pharmaceutical raw materials, in particular to a method for recovering dimethylamine from nicosulfuron wastewater. Background technique [0002] Dimethylamine is a gas at room temperature and has a smell similar to ammonia. It is mainly used as a rubber vulcanization accelerator, leather hair remover, medicine, pesticide, textile industry solvent, dye, explosive, propellant and dimethyl fat, N, N - Raw materials for organic intermediates such as dimethylformamide. Dimethylamine is an important intermediate of pesticides, which can be used to prepare fungicides thiram, thiram, thiram zinc, thiram nickel, thiram arsenic, tuzet, pyrimol; Monosultap, Bhartap, Borera; Herbicides Nicosulfuron, Chlorotoluron, Isoproturon, Cyclopyrone, Fluuron, etc. [0003] Dimethylamine hydrochloride is mainly used as a catalyst ...

Claims

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Application Information

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IPC IPC(8): C07C211/04C07C209/86C07C209/00C07D401/12
Inventor 王多余王春刘改玲陈越李辉
Owner ANHUI KELIHUA CHEM
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