Hydrogen sulfide liquid-phase oxidation removing method taking deep-eutectic solvent as medium

Abstract

The invention discloses a hydrogen sulfide liquid-phase oxidation removing method taking a deep-eutectic solvent as a medium, and belongs to the field of chemical separation. Various functionalized deep-eutectic solvents are obtained by mixing one or more of mixture of an amide derivative and a diol derivative serving as a hydrogen bond donor as well as imidazolium salt, quaternary ammonium salt or choline serving as a hydrogen bond receptor according to a certain molar ratio; and the deep-eutectic solvents have the characteristics of stable physical and chemical properties, low price, easiness in preparation, excellent solubility on H2S gas and easiness in recovery. The deep-eutectic solvent designed by the invention can face at the H2S gas in various types of sulfur-containing gas source, efficiently realizes selective trapping of H2S gas and transforms the enriched H2S into high-purity sulfur rapidly by a normal-temperature liquid phase oxidation method; the deep-eutectic solvent can be regenerated and reused after being dried; and the whole process has the advantages of high desulfurization efficiency, mild operation condition, low energy consumption, no discharge of VOCs and the like, and is a novel, green and efficient H2S oxidation removing method.

Description

technical field [0001] The invention belongs to the field of chemical separation, and relates to a method for removing hydrogen sulfide and its resource utilization, in particular to a method for converting hydrogen sulfide into sulfur through high-efficiency liquid phase oxidation at room temperature after enriching hydrogen sulfide in a deep eutectic solvent. Background technique [0002] Hydrogen sulfide (H 2 S) is a highly corrosive and flammable highly toxic gas, which widely exists in gaseous fuels such as natural gas, refinery gas, and synthesis gas, and also in industrial and agricultural gases such as coalbed methane and biogas. h 2 The existence of S not only seriously threatens the environment and personal safety, but also causes equipment and pipeline corrosion, catalyst poisoning, etc. in the process of gas transportation and utilization. How to convert highly toxic and highly corrosive H 2 The safe and reliable storage of S gas and the green and efficient re...

AI Technical Summary

Problems solved by technology

Compared with the dry method, the wet method removes H 2 S has always been the mainstream of industrial process technology, and the most typical alcohol amine method also has many bottleneck problems in its application process: (1) Capture and remove H 2 The energy consumption of the S process is high; (2) Most alcohol amine absorbents are volatile, and volatile substances (VOCs) will be emitted into the atmosphere during use, forming secondary pollution; (3) Organic amines are easy to degrade or oxidize lead to lower desulfurization efficiency

At present, numerous published patents (CN101961598A, CN101993378A, CN103159632A, US2009291872A1 and WO2009142663A1) only report H 2 A new process for the reversible capture of S in absorbents, while no DESs have captured H 2 The related method reports of S and its in situ transformation, especially the replacement of traditional volatile organic solvents by DESs, is obviously more attractive to be applied to the liquid phase oxidation process.

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