Sodium cyanate can be synthesized with pesticide to realize green chemical process
Editor：川东化工Time：2019-12-30Hits：
Phosgene is a very dangerous chemical gas in the synthesis of pesticides, which has been banned or restricted in many countries. With the advent of the era of green chemistry, it is urgent to find a clean production way to replace phosgene. Using sodium cyanate instead of phosgene in the synthesis of pesticides has the advantages of high safety, high yield and quality, and less waste material.
Sodium cyanate process has the advantages of high safety, high yield and quality, and less waste. It is a promising green production process. Especially for the synthesis of sulfonylurea herbicide intermediates, sodium cyanate can replace silver cyanate to synthesize isocyanate, and can also directly synthesize sulfonylurea herbicides in one step.
The advantages of one-step reduction method are that it avoids the use of highly toxic phosgene, does not use n-butyl isocyanate, and avoids the generation of a large number of by-products n-butylamine; all solvents can be recycled and reused, basically without pollutant discharge; it shortens the process route, mild reaction conditions, and saves energy consumption.
Therefore, the use of sodium cyanate is an environmentally friendly and convenient method for the synthesis of sulfonylurea compounds. Using sodium cyanate instead of phosgene in pesticide synthesis is a promising green production process.
