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Method for recovering dimethylamine hydrochloride from industrial wastewater

A technology for dimethylamine hydrochloride and industrial wastewater, which is applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problems of waste of manpower, material resources, and poor living environment of wastewater, and achieve the realization of Effects of zero liquid discharge, improved recovery rate, good social and environmental benefits

Inactive Publication Date: 2018-11-06
XINYI AGRI CHEM PLANT JIANGSU PROV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the synthesis of hexazinone, the synthesis of its intermediate guanidine produces a large amount of waste water, which has brought huge pressure on the environmental protection of the enterprise. The treatment of waste water not only wastes a lot of manpower and material resources, but also makes our living environment become worse. worse and worse

Method used

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Examples

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Effect test

Embodiment 1

[0024] A method for reclaiming dimethylamine hydrochloride in industrial waste water, the method for reclaiming dimethylamine hydrochloride comprises the steps:

[0025] 1) Take the wastewater generated during the production of N,N-dimethyl-N'-methyl-N'-cyclohexylguanidine, and adjust the pH of the industrial wastewater to 7 with hydrochloric acid;

[0026] 2) The industrial wastewater treated in step 1) is distilled under reduced pressure to separate the organic matter from water, the pressure during the reduced pressure distillation is 30mmHg, and the temperature is 80°C; the organic matter is mainly dimethylamine hydrochloride, guanidine and other organic impurities; The steamed water is 65% of industrial wastewater;

[0027] 3) Use an organic solvent to dissolve the organic matter and lower the temperature to 10°C to precipitate dimethylamine hydrochloride in the organic matter; the ratio of the amount of the organic solvent to the organic matter is 1:1, and the organic so...

Embodiment 2

[0030] A method for reclaiming dimethylamine hydrochloride in industrial waste water, the method for reclaiming dimethylamine hydrochloride comprises the steps:

[0031] 1) Take the wastewater generated during the production of N,N-dimethyl-N'-methyl-N'-cyclohexylamide, and use nitric acid to adjust the pH of the industrial wastewater to 7;

[0032] 2) The industrial waste water after step 1) is subjected to vacuum distillation to separate organic matter and water, the pressure during vacuum distillation is 35mmHg, and the temperature is 70°C; the steamed water is 68% of the industrial waste water;

[0033] 3) Use an organic solvent to dissolve the organic matter and lower the temperature to 12°C to precipitate dimethylamine hydrochloride in the organic matter; the ratio of the amount of the organic solvent added to the organic matter is 2:1, and the organic solvent includes 40wt% toluene and 50wt% ethanol and 10 wt% methyl isobutyl ketone. Through the combination of toluene,...

Embodiment 3

[0036] A method for reclaiming dimethylamine hydrochloride in industrial waste water, the method for reclaiming dimethylamine hydrochloride comprises the steps:

[0037] 1) Take the wastewater generated during the production of N,N-dimethyl-N'-methyl-N'-cyclohexyl guanidine, and use p-toluenesulfonic acid to adjust the pH of the industrial wastewater to 7;

[0038] 2) The industrial waste water after step 1) is subjected to vacuum distillation to separate organic matter and water, the pressure during vacuum distillation is 40mmHg, and the temperature is 80°C; the steamed water is 70% of the industrial waste water;

[0039] 3) Use an organic solvent to dissolve the organic matter and lower the temperature to 10°C to precipitate dimethylamine hydrochloride in the organic matter; the ratio of the amount of the organic solvent to the organic matter is 3:1, and the organic solvent includes 36wt% toluene and 50wt% ethanol and 14 wt% methyl isobutyl ketone. Through the combination o...

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Abstract

The present invention relates to a method for recovering dimethylamine hydrochloride from industrial wastewater, and the method for recovering the dimethylamine hydrochloride comprises the following steps: 1) adjusting the pH of the industrial wastewater with an acid to 7; 2) distilling the industrial wastewater treated by the step 1) under reduced pressure to separate an organic matter and water;3) dissolving the organic matter in an organic solvent and cooling to 10 to 15 DEG C to precipitate THE dimethylamine hydrochloride FROM the organic matter; AND 4) centrifugally separating a mixturetreated in the step 3), and drying to obtain the high purity dimethylamine hydrochloride. The method has simple process and mature process, is suitable for industrial utilization, and can be used forthe treatment of high-salt wastewater of hexazinone or even other industries.

Description

technical field [0001] The invention relates to a treatment method for salt-containing industrial waste water, in particular to a method for recovering dimethylamine hydrochloride in the waste water produced by the synthesis of its intermediate guanidine in the production process of hexazinone. Background technique [0002] Hexazinone is a systemic selective, post-emergent triazepine herbicide developed by DuPont Company of the United States in 1974. Because of its strong killing power to weeds and shrubs, it is widely used in the United States, Australia, Countries such as New Zealand have been widely used. However, during the synthesis of hexazinone, the synthesis of its intermediate guanidine produces a large amount of waste water, which has brought huge pressure on the environmental protection of the enterprise. The treatment of waste water not only wastes a lot of manpower and material resources, but also makes our living environment become worse. worse and worse. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/04C07C209/86C02F9/10C02F101/30C02F101/38
CPCC02F9/00C02F2101/30C02F2101/38C07C209/86C07C211/04
Inventor 顾思雨邓玉智王小虎
Owner XINYI AGRI CHEM PLANT JIANGSU PROV
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