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Isoester continuous production process and reactor

A production process and reactor technology, which is applied in the field of isoester continuous production process and reactor, and can solve the problems of low conversion rate of sodium thiocyanate and dichloropropene

Pending Publication Date: 2022-05-27
河北野田农用化学有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a continuous isoester production process and reactor, which solves the problem of low conversion rate of sodium thiocyanate and dichloropropene in the prior art

Method used

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  • Isoester continuous production process and reactor
  • Isoester continuous production process and reactor

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Embodiment Construction

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts are all related to the protection scope of the present invention.

[0032] like figure 1 As shown, the present embodiment proposes an isoester continuous production process, comprising the following steps:

[0033] S1, sodium thiocyanate aqueous solution and dichloropropene are passed through successively through cyanide reaction column one, through cyanide reaction column two, and after the reaction of thermal stratifier one, product A and product B are obtained;

[0034] S2, the product A is passed into the distillation colu...

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Abstract

The invention relates to the technical field of isoester synthesis, and provides an isoester continuous production process which comprises the following steps: S1, sequentially introducing a sodium thiocyanate aqueous solution and dichloropropene into a first cyanogen-passing reaction column, a second cyanogen-passing reaction column and a first thermal layering device for reaction to obtain a product A and a product B; s2, the product A is introduced into a distillation tower for a reaction, a product C and a product D are obtained, the product B and dichloropropene are sequentially introduced into an alkene-passing reaction column I, an alkene-passing reaction column II and a thermal layering device II for a reaction, and a product E and a product F are obtained; s3, introducing the product D and the product F into a cyanogen-passing reaction column I; s4, the product E is introduced into a wastewater evaporation separation coupler for a reaction, and a product G and a product H are obtained. Through the technical scheme, the problem of low conversion rate of sodium thiocyanate and dichloropropene in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of isoester synthesis, in particular to a continuous isoester production process and a reactor. Background technique [0002] Thiamethoxam is a second-generation nicotinic high-efficiency and low-toxicity insecticide with a brand-new structure. It has stomach toxicity, contact killing and systemic activity against pests. It is used for foliar spraying and soil irrigation. It is quickly absorbed by the system after spraying, and is transmitted to all parts of the plant, which has a good control effect on piercing-sucking pests such as aphids, planthoppers, leafhoppers, and whiteflies. [0003] In the preparation of thiamethoxam, 2-chloro-5-chloromethylthiazole, the precursor of thiamethoxam, needs to be obtained first, and 2-chloropropenyl isosulfide needs to be obtained first in the preparation of 2-chloro-5-chloromethylthiazole Cyanate ester, wherein, 2-chloropropenyl isothiocyanate is obtained by sodium t...

Claims

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Application Information

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IPC IPC(8): C07C331/22B01D3/00B01J4/02B01J19/00B01J19/24
CPCC07C331/22B01J19/0053B01J19/24B01J19/00B01J4/02B01J19/0006B01D3/00B01D3/009Y02P20/10
Inventor 夏金科周扬刘建峰郭永亮任晓倩朱西志刘占民
Owner 河北野田农用化学有限公司
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