METHOD FOR REMOVING HYDROGEN SULPHIDE Russian patent published in 2023 - IPC B01D53/14 B01D53/52 B01D53/86 B01D53/96 C10L3/10 C01B17/64 

FIELD: chemistry.

SUBSTANCE: removal of gaseous hydrogen sulphide; production of a thiosulfate product. Group of inventions relates to a method for the continuous removal of gaseous hydrogen sulphide (H₂S) from a fluid stream and subsequent selective production of a thiosulfate product. Processes for treating a hydrogen sulphide-containing gas stream include absorbing H₂S in an aqueous treatment solution followed by an oxidation reaction to produce thiosulfate using a catalyst containing vat dyes. The spent catalyst is regenerated in the oxidation tank using an oxygen-containing gas and recycled for use as a component of the aqueous treatment solution. Process for treating a hydrogen sulphide-containing gas stream, a feed stream containing hydrogen sulphide and another feed component is introduced into an absorption tank such that the feed stream flows upward from the bottom of the absorption tank and comes into contact with a treatment liquid solution, the treatment liquid containing a sulphur dye catalyst. The hydrogen sulphide is absorbed into the treatment slurry and converted to sulphide ions. The other feed component is removed from the absorption tank substantially free of hydrogen sulphide, and the spent treatment solution is also removed from the absorption tank and introduced into the oxidation tank where it comes into contact with an oxygen-containing gas, causing the sulphide ions to be oxidized to thiosulfate and converting the spent sulphur dye catalyst into a regenerated sulphur dye catalyst. The thiosulfate is recovered and the regenerated sulphur dye catalyst can be returned as a component of the treatment slurry. According to another embodiment of the process, a portion of the regenerated treatment solution is removed from the oxidation tank to not only prevent build-up of thiosulfate in the process, but also to recover thiosulfate as a usable and economical by-product.

EFFECT: group of inventions provides removal of gaseous hydrogen sulphide (H₂S) from the gas stream.

19 cl, 4 dwg