Post-treatment method of hydrogen sulfide

Abstract

The invention provides a post-treatment method of hydrogen sulfide. The method comprises chilling of hydrogen sulfide synthesis gas and backflow of hydrogen sulfide. According to the invention, by selecting a chilling tower, the generation of polysulfide is avoided, the post-treatment step of the polysulfide is simplified, and the liquefaction of sulfur entrained in the hydrogen sulfide synthesis gas can be realized in one step, wherein the purity of the prepared pure hydrogen sulfide reaches 99.95%, and the polysulfide is trace; liquid-state hydrogen sulfide is selected as a low-temperature medium, and other cooling mediums are not introduced, so that secondary treatment is avoided; and in the hydrogen sulfide liquefaction process, released heat can be recycled, and heating and heat preservation of solid sulfur or a hydrogen sulfide reactor, a reaction pipeline and the like are carried out.

Description

technical field [0001] The invention relates to the field of sulfide synthesis, in particular to a method for aftertreatment of hydrogen sulfide. Background technique [0002] Hydrogen sulfide is an industrially important intermediate, for example for the synthesis of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, sulfonic acid, dimethyl sulfoxide and for the reactions of many sulfides. [0003] The commonly used preparation method in industry is to react sulfur and hydrogen to obtain hydrogen sulfide, but the conversion rate of sulfur and hydrogen is relatively slow, and a catalyst is needed to achieve high conversion rate. These methods are described in US5173285, US4629617, WO8200632, US4094961 and other documents There are plenty of descriptions. Usually includes the hydrogen sulfide crude gas collected in the reactor needs to undergo single-stage or multi-stage condensation In the process of hydrogen sulfide synthesis, there are usually polysulfide H 2 Genera...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is the use of a large amount of water. At the same time, the sprayed alkaline solution droplets are easily entrained by hydrogen sulfide gas, and enter the subsequent reaction together, which needs to be further removed. This method is used to produce sulfhydryl alkaline substances It works

[0008]According to the existing hydrogen sulfide preparation technology, it is found that there are the following problems: the polysulfides that are easy to form during the condensation process of hydrogen sulfide synthesis gas are very unfavorable for subsequent treatment, Most of the existing technologies use catalysts or filtering devices such as molecular sieves to remove them. The sulfur obtained by decomposition in this process is further recovered, and the catalyst is regenerated. This technology is not friendly to continuous operation, and the catalyst is also easily polluted by entrained sulfur or impurities.

Images