Process for producing high yield methyl isocyanate

Abstract

The invention discloses a process for producing high yield methyl isocyanate. Trimerization methyl isocyanate is effectively reduced by adding a polymerization inhibitor to methyl isocyanate which is produced when a methylamine formyl chloride solution is heated in a decomposer and decomposed. The process for producing the high yield methyl isocyanate is simple in process operation, reduces nearly 60% production rate of terpolyesters, and reduces production cost. The process for producing the high yield methyl isocyanate can prevent a process pipeline from being plugged simultaneously, is excellent in production fluency, reduces labor strength of solid waste, improves work environment, is friendly in natural environment, reduces solid waste, and reduces production cost by about 3%.

Description

technical field [0001] The invention relates to a production process for increasing the yield of methyl isocyanate monomer. Background technique [0002] Methyl isocyanate is a widely used chemical raw material and an important intermediate for the synthesis of pharmaceuticals or pesticides. [0003] The general production of methyl isocyanate mainly has four steps of chemical reactions. Oxygen reacts with coke to generate carbon monoxide, carbon monoxide reacts with chlorine to generate phosgene, phosgene reacts with monomethylamine to generate carbamoyl chloride, and carbamoyl chloride is dissolved in a solvent In the decomposer, it is heated and decomposed to generate methyl isocyanate. During the heating process, part of the methyl isocyanate self-polymerizes to generate trimeric methyl isocyanate. The daily production of 10,000L methyl isocyanate can produce about 400 kg of solid waste trimer, which is blocked The process pipeline, the production is not smooth, and the...

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