Treatment system and treatment method of residues in methyl isocyanate synthetic process

Abstract

The invention provides a treatment system of residues in a methyl isocyanate synthetic process. The treatment system comprises a residue isolation tank, a blending groove and a residue steaming tank, wherein the residue isolation tank is used for collecting a residue material generated after decomposition of methylaminoformyl chloride in the methyl isocyanate synthetic process, standing and layering to obtain a liquid-phase material on the upper layer and a sediment material on the lower layer; the blending groove is connected with the top of the residue isolation tank and is used for collecting the liquid-phase material on the upper layer for cyclic utilization; the residue steaming tank is connected with the bottom of the residue isolation tank, and is used for collecting the sediment material on the lower layer as well as steaming and filtering the sediment material to separate the residues. The invention further provides a treatment method of the residues in the methyl isocyanate synthetic process. According to the system and the method, the generated residues can be separated effectively, and the liquid-phase material can be continuously and cyclically utilized, so that the problem that the residues in the methyl isocyanate synthetic process are difficult to effectively clear in time, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a treatment system and a treatment method for residues in a synthesis process of methyl isocyanate. Background technique [0002] Methyl isocyanate is the most important intermediate in the synthesis of carbamate pesticides. In China, carbofuran is mainly synthesized by methyl isocyanate and furanol, o-isopropylphenol, o-sec-butylphenol, m-cresol, and methomyl oxime. , Isoprocarb, Zhongbucarb, Methomyl and Methomyl and other high-efficiency and low-toxicity pesticides. [0003] The traditional methyl isocyanate synthesis process is to obtain methyl carbamoyl chloride by reacting methylamine and phosgene, then dissolve carbamoyl chloride in chloroform solvent, and obtain methyl isocyanate and by-product hydrochloric acid through pyrolysis, and finally through crude distillation , Distillation to obtain pure methyl isocyanate. The residue formed during the synthesis of methyl iso...

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a treatment system for residues in the synthesis process of methyl isocyanate for the problem that the residues in the traditional synthesis process of methyl isocyanate are difficult to be removed in a timely and effective manner.

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