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Method for the separation of methyl mercaptan from reaction gas mixtures

A technology of reaction mixture and methyl mercaptan, which is applied in the preparation of organic compounds, mercaptan preparation, chemical instruments and methods, etc., and can solve problems such as unavoidable, difficult to control, and environmental pollution

Inactive Publication Date: 2007-01-10
EVONIK OPERATIONS GMBH
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Problems solved by technology

[0006] In addition to the high capital and operating costs (typically requiring 40 theoretical stages of columns rated at 232 psi (16 bar), where the rated pressure level is a measure of the stability of the reactor used), the disadvantages of this processing by distillation of the complex reaction mixture are Unavoidable formation of residues that must be disposed of, thus resulting in loss of resources
In addition, a 2-phase mixture of water and sulfur compounds may form during processing by distilling the reaction mixture in a pool, making control of the column substantially more difficult
In addition to environmental pollution, further processing of methyl mercaptan without separation of the mixture can lead to a large amount of waste products in the production of subsequent products such as methionine, so separation is unavoidable

Method used

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  • Method for the separation of methyl mercaptan from reaction gas mixtures

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Embodiment

[0025] The present invention passes through attached flowchart ( figure 1 ) to describe as follows:

[0026] Crude methyl mercaptan obtained according to e.g. EP0850923 has the following composition: methyl mercaptan - 93% by weight, dimethyl sulfide - 4.5% by weight, dimethyl ether - 1.5% by weight, water - 1% by weight and traces of methanol or methyl mercaptan Mercaptan ~ 93% by weight, dimethyl sulfide 1.5-5% by weight, dimethyl disulfide 0.2-1% by weight, dimethyl ether 0.5-3% by weight, water ~ 1% by weight and trace methanol, the crude form Mercaptans are fed (in gas and / or liquid form) via 1 or 8 into reactor R1 with MMP, which operates in a cycle at a pressure of 14.5-72.5 psi (1-5 bar) at a temperature as described in DE 2320544 at 50 to 120°C. The acrolein to be converted to MMP is supplied via line 2 and the mixture of various catalysts (such as a mixture of pyridine and acetic acid as described in FR 1520328, or other mixtures of organic bases and organic acids)...

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Abstract

The invention relates to a method for the separation of methyl mercaptan from reaction gas mixtures obtained by means of the catalytic conversion of H2S with methanol, by means of converting the methyl mercaptan into MMP in the presence of the byproducts with acrolein, and separating the same.

Description

technical field [0001] The present invention relates to H 2 A method for separating methyl mercaptan from the reaction gas mixture obtained by catalytic conversion of S and methanol. Background technique [0002] Methyl mercaptan is a synthetic nutrient amino acid methionine or 2-hydroxy-4-methyl mercaptobutyric acid (the hydroxianalologous 2-hydroxi-4-methyl mercaptobutyric acid (MHA)), and the preparation of dimethyl sulfoxide and An industrially important precursor of dimethyl sulfone. Today, it is mainly produced from methanol and hydrogen sulfide by conversion over aluminum catalysts. The synthesis of methyl mercaptan is usually carried out in the gas phase at a temperature of 300-500° C. and a pressure of 14.5-362.59 psi (1-25 bar). In order to increase the activity and selectivity of the catalyst, it is usually coated with potassium tungstate as a cocatalyst. The conversion of hydrogen sulfide and methanol to methyl mercaptan is an exothermic process in which 28,5...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C319/28C07C319/18C07C321/04C07C323/22
CPCC07C319/28C07C319/08C07C319/18C07C321/04C07C323/22
Inventor 亚历山大·莫勒沃尔夫冈·伯克斯特凡·劳藤伯格汉斯-约阿希姆·哈塞尔巴赫沃尔夫冈·陶格纳哈拉尔德·海因策尔特奥·扎弗尔
Owner EVONIK OPERATIONS GMBH
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