A kind of production method of methyl mercaptide

A technology of methyl mercaptan salt and production method, which is applied in directions such as mercaptan preparation, organic chemistry, etc., can solve the problems of incomplete reaction of methyl mercaptan, unfavorable industrialized production, and great potential safety hazard, so as to meet market requirements and industrialized production needs. , Eliminate bad smell, eliminate the effect of blocking the pipeline

Active Publication Date: 2018-01-12
NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, dimethyl sulfate is a toxic compound, which is volatile and has great potential safety hazards. The reaction temperature is high, but the product yield is very low, generally about 70% to 80%, and the sodium sulfide content in the final product is relatively high. , the wastewater treatment cost is high and difficult, which is not conducive to industrial production
[0003] In addition, strong alkali solutions such as methyl mercaptan gas and sodium hydroxide can also be adopted to carry out absorption reactions by bubbling in a reactor to prepare methyl mercaptides such as sodium methyl mercaptide, but this method has the following problems: 1 1. The reaction of methyl mercaptan is incomplete, the absorption efficiency is low, and the reaction time is long; 2. During the preparation process, the content of methyl mercaptan in the pipeline must be strictly controlled, otherwise it will easily lead to crystallization of methyl mercaptan, which will block the pipeline and affect reaction, and its operation is cumbersome, and the content of methyl mercaptide needs to be detected frequently; however, when controlling the content of methyl mercaptide in the reaction product to an appropriate content, although the risk of blocking the pipeline is greatly reduced, there are still some crystallization of methyl mercaptide The phenomenon

Method used

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  • A kind of production method of methyl mercaptide
  • A kind of production method of methyl mercaptide
  • A kind of production method of methyl mercaptide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of production method of methyl mercaptide, as attached figure 1 As shown, it specifically adopts the following reaction device, which includes a primary static mixer 1, a secondary static mixer 2, a primary kettle 3, a secondary kettle 4, a primary mixer 5, a secondary mixer 6, and a Alkali tank 7, primary preheater 8, secondary preheater 9 and gas-liquid separator 10; primary static mixer 1 communicates with liquid methyl mercaptan feed line, primary kettle 3 and primary mixer 5 respectively The primary kettle 3 is also communicated with the secondary static mixer 2, the primary mixer 5, the waste liquid discharge pipeline and the product discharge pipeline respectively; the primary mixer 5 is also connected with the secondary kettle 4; the secondary static mixing Device 2 is also communicated with secondary kettle 4 and secondary preheater 9 respectively; Secondary kettle 4 is also communicated with secondary mixer 6 and waste gas pipeline respectively; The se...

Embodiment 2

[0028] A kind of production method of methyl mercaptide, as attached figure 2As shown, it specifically adopts the following reaction device, which includes a primary static mixer 1, a secondary static mixer 2, a primary kettle 3, a secondary kettle 4, a primary mixer 5, a secondary mixer 6, and a Alkali tank 7, primary preheater 8 and secondary preheater 9; primary static mixer 1 communicates with liquid methyl mercaptan feed line, primary kettle 3 and primary mixer 5 respectively; primary kettle 3 It is also communicated with secondary static mixer 2, primary mixer 5, waste liquid discharge pipeline and product discharge pipeline respectively; primary mixer 5 is also communicated with secondary kettle 4; secondary static mixer 2 is also connected respectively with The secondary kettle 4 is communicated with the secondary preheater 9; the secondary kettle 4 is also communicated with the secondary mixer 6 and the waste gas pipeline respectively; the secondary mixer 6 is also c...

Embodiment 3

[0033] A kind of production method of methyl mercaptide, it specifically adopts the reaction unit described in embodiment 1, and carries out according to the following steps:

[0034] Liquid methyl mercaptan is added into the first-stage static mixer 1 through the feed line to be directly vaporized, and then passes through the alkali distribution tank 7, the first-stage preheater 8, the second-stage mixer 6, the second-stage preheater 9, The sodium hydroxide solution coming from the secondary static mixer 2, the secondary kettle 4, and the primary mixer 5 carries out the absorption reaction, and the reaction product containing sodium methyl mercaptide generated by the reaction is buffered in the primary kettle 3, and the absorption is not complete The methyl mercaptan gas overflows from the top of the primary kettle 3 and enters the secondary static mixer 2. In this step, the sodium hydroxide solution is preheated to 42° C. through the primary preheater 8, and the secondary pre...

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Abstract

The invention relates to a production method of methyl mercaptan salt. The method comprises the steps that a strong alkali solution is subjected to second-level preheating and conducts an absorption reaction with methyl mercaptan gas to prepare the methyl mercaptan salt, and the percentage mass content of the methyl mercaptan salt in a reaction product is controlled to be 18%-24%. By means of the method, crystallization of sodium methyl mercaptide generated through the reaction can be avoided, and the risk of plugging a pipeline is thoroughly eliminated.

Description

technical field [0001] The present invention relates to a kind of production method of methyl mercaptide. Background technique [0002] Sodium methyl mercaptide can be used in the synthesis of pesticides, medicines, raw materials for dye intermediates and various spices and other products, for the preparation of daily use and food flavor methyl ethyl sulfide, 4-methylthio-2 butanone, 2 -Methylthiopyrazine, synthetic pesticides methylthioglyoxaldoxime, promethazin, siclozin and the preparation of organic solvents such as dimethyl sulfoxide. At present, there are many methods for synthesizing methyl mercaptans such as sodium methyl mercaptide. Taking sodium methyl mercaptide as an example, the technology adopted in China mainly uses sodium hydrosulfide and dimethyl sulfate to react to generate methyl mercaptan gas, and then use liquid Alkali absorption. In this method, dimethyl sulfate is a toxic compound, which is volatile and has great potential safety hazards. The reactio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C319/12C07C321/04
CPCC07C319/12C07C321/04
Inventor 丁永良刘丹柳亚玲何咏梅万霞
Owner NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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