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Method and device for purifying and separating methyl mercaptan

A technology for purification and separation of methyl mercaptan, applied in chemical instruments and methods, organic chemistry, preparation of organic compounds, etc., can solve the problems of hydrogen sulfide affecting the yield and achieve the effect of improving separation efficiency

Pending Publication Date: 2022-03-29
NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The refined methyl mercaptan still contains methanol and hydrogen sulfide components, and the super reactivity of hydrogen sulfide will affect the yield of subsequent use

Method used

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  • Method and device for purifying and separating methyl mercaptan

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Embodiment 1

[0032] The purification and separation device of embodiment 1 methyl mercaptan

[0033] Such as figure 1 Shown in, the purification and separation device of methyl mercaptan comprises dehydrogen sulfide tower 1, evaporation tower 2, water absorption tower 3, absorption liquid absorption tower 4 and distillation-condensation tower 5;

[0034] The bottom of the dehydrogenation tower 1 is provided with an organic phase inlet, the top of the desulfurization tower 1 is provided with an H2S outlet, the bottom of the dehydrogenation tower 1 is connected to the bottom of the evaporation tower 2, and the desulfurization The top of the hydrogen tower 1 communicates with the bottom of the water absorption tower 3, and a circulating spray system 7 is provided between the bottom and the top of the water absorption tower 3, and the circulating spray system 7 includes a The shower head in the tower 3 and the circulation pipeline that is connected with the bottom of the water absorption towe...

Embodiment 2

[0035] The purification separation method of embodiment 2 methyl mercaptan

[0036]The mixed gas coming out of the methyl mercaptan reactor is heat-exchanged, the temperature is reduced from 300-400°C to 110-130°C, the pressure is 8-10bar, and the mixed gas is condensed into an aqueous phase and an organic phase. In the condensed organic phase, the content of methylmercaptan>80wt%, the content of methanol is 1-8wt%, the content of hydrogen sulfide is 1-15wt%, and the content of dimethyl sulfide is 0.3-3wt%. ~14bar, the temperature at the top of the tower is 25~30°C to distill hydrogen sulfide until the content of hydrogen sulfide in the organic phase is less than 1wt%; dehydrogen sulfide tower 1 uses trays or packing or tubes, and the tray style, packing method and tubes are not used limit;

[0037] The organic phase of the tower kettle of the dehydrogenation tower 1 is transferred to the evaporation tower 2. The purpose of the evaporation tower 2 is to gasify the methyl merc...

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Abstract

The invention relates to the field of methyl mercaptan production, in particular to a purification and separation method and device for methyl mercaptan, and the device comprises a hydrogen sulfide removal tower, an evaporation tower, a water absorption tower, an absorption liquid absorption tower and a distillation-condensation tower which are sequentially connected through pipelines. Compared with the prior art, the method and the device for purifying and separating the methyl mercaptan have the advantages that the acidity of the hydrogen sulfide is higher than that of the methyl mercaptan, and the solubility of the methanol in water is higher than that of the methanol in the methyl mercaptan, so that the methanol and the hydrogen sulfide in the methyl mercaptan are removed by using the weak-base water solution, and the methyl mercaptan which does not contain the hydrogen sulfide and the methanol is obtained; after methanol and hydrogen sulfide in the weak base aqueous solution are enriched, hydrogen sulfide and methanol are obtained again through high-temperature regeneration / distillation, and regenerated liquid is returned to methyl mercaptan for purification, so that the separation efficiency is effectively improved, and the influence on the subsequent use yield due to existence of hydrogen sulfide in methyl mercaptan is avoided.

Description

technical field [0001] The invention relates to the field of methyl mercaptan production, in particular to a purification and separation method and device for methyl mercaptan. Background technique [0002] There are roughly three methods for the synthesis of methyl mercaptan: the first method is obtained by nucleophilic substitution of hydrogen sulfide and methyl halide, which is expensive and only suitable for small doses of preparation; the second method is disulfide disulfide The nucleophilic substitution of methyl ester and sulfide is prepared. In theory, every equivalent of methyl mercaptan produced will be accompanied by 0.5 equivalent of sulfate. Because of the incompleteness and residue of the reaction, the treatment cost of sulfate is high, especially in the current environment. In the case of increasingly strict conditions; the third method is also the main method of industrial production, which is prepared by catalytic dehydration reaction of hydrogen sulfide and...

Claims

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Application Information

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IPC IPC(8): C07C319/28C07C321/04
CPCC07C319/28C07C321/04
Inventor 连许帅曹华伟刘帮林袁代强谢绍林刘波马东訾跃东
Owner NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD