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Clean production technology of dazomet raw medicine

A technology of clean production and long-term drug application in the field of pesticides to achieve the effects of no environmental pollution, improved production efficiency, and high reaction yield

Inactive Publication Date: 2017-11-24
NANTONG SHI ZHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production method of daniron is mainly the use of raw materials methylamine and carbon disulfide provided by BASF to synthesize intermediate N-methyldithiocarbamic acid as a raw material, and then react with formaldehyde to obtain daniron. There are certain drawbacks in this process, but its The technological process is the mainstream, and other companies only make some fine-tuning on the basis of its production, and make some improvements in energy and environmental optimization by reducing energy consumption.

Method used

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Embodiment Construction

[0011] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with examples, which are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0012] A clean production process of damelong technical, its implementation process is as follows:

[0013] Salt-forming process: add 40% methylamine aqueous solution and water into the salt-forming reaction kettle, stir, cool down to below 30°C, add carbon disulfide dropwise, keep warm for several hours after the dropwise addition is completed, let stand for stratification, and transfer the upper layer of water phase into The next step reaction is carried out in the ring-closing kettle, and the lower oil phase is mainly excess carbon disulfide, which is put into the storage tank and returned to the salt-forming kettle in the next round of feeding;

[0014] Cycling process: the water phas...

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Abstract

The invention discloses a clean production process of dametomon technical, which comprises the following steps: monomethylamine and carbon disulfide form a salt, and the reaction is complete; the salt and formaldehyde undergo a cyclization reaction to transform into damemeil, and the reaction yield is 97%. During the implementation of the new process, equipment such as a salt-forming reactor and a ring-closing reactor are required. The invention has the advantages that the reaction yield is high, the production efficiency is greatly improved, the price of the reaction raw materials used is moderate, and there is no pollution to the environment.

Description

technical field [0001] The invention relates to the field of pesticides, in particular to a clean production process of dameron technical. Background technique [0002] Mianlong is an environmentally friendly broad-spectrum comprehensive soil fumigation disinfectant with high efficiency, low toxicity and no residue. When applied in wet soil, it decomposes into toxic methyl isothiocyanate, formaldehyde and hydrogen sulfide in the soil, and quickly spreads to the soil particles, effectively killing various nematodes, pathogenic bacteria, underground pests and Germinated weed seeds, so as to achieve the effect of cleaning the soil. At present, the production method of daniron is mainly the use of raw materials methylamine and carbon disulfide provided by BASF to synthesize intermediate N-methyldithiocarbamic acid as a raw material, and then react with formaldehyde to obtain daniron. There are certain drawbacks in this process, but its The technological process is the mainstre...

Claims

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Application Information

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IPC IPC(8): C07D285/34
CPCC07D285/34
Inventor 仇耀康刘建华刘文华
Owner NANTONG SHI ZHUANG CHEM