REMOVAL OF AROMATIC HYDROCARBONS FROM POOR ACIDIC GAS MATERIAL FOR PRODUCTION OF SULPHUR Russian patent published in 2019 - IPC B01D53/14 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of removing aromatic hydrocarbons from poor acid gas containing less than 20 mol. % of H₂S. Method includes contacting a stream of poor acid gas with selective H₂S ratio solution of liquid absorbent in first absorption zone to produce gas stream depleted of H₂S, and H₂S-enriched absorbent solution. Further, absorbent solution is introduced into non-thermal steam stripping zone, where it is brought into contact with stream of stripping gas to obtain absorbent solution, which is depleted of C₄⁺ aliphatic and aromatic hydrocarbons, and flow of stripping gas, enriched with aromatic and C₄⁺ with aliphatic hydrocarbons. Further, the stream of stripping gas is brought to the selective with respect to H₂S solution of liquid absorbent in second absorption zone to produce flow of stripping gas, depleted of H₂S, and H₂S-enriched absorbent solution. Conducting absorbent solution into desorption zone, in which is selective with respect to H₂S solution of liquid absorbent and poor acid gas is formed.

EFFECT: invention enables to remove large amounts of aromatic hydrocarbons, such as BTX and C₄⁺ aliphatic hydrocarbons from poor acidic gases containing less than 20 mol% of H₂S.

18 cl, 2 dwg, 2 ex