Patent ID: 7803271
Filing Date: 2010-09-28
Classification: B01D,C01B,C10G,C10L

Abstract:
1. A method of extracting the hydrogen sulfide contained in a gas comprising aromatic hydrocarbons, wherein the following stages are carried out: a) contacting said gas with an absorbent solution so as to obtain a gas depleted in hydrogen sulfide and an absorbent solution laden with hydrogen sulfide, b) performing a first expansion of the hydrogen sulfide-laden absorbent solution obtained at stage a) so as to release a gaseous fraction containing aliphatic hydrocarbons, c) heating, then expanding the hydrogen sulfide-laden absorbent solution obtained after the first expansion performed at stage b) to a predetermined temperature and pressure so as to release a gaseous fraction comprising aromatic hydrocarbons and to obtain an absorbent solution depleted in aromatic hydrocarbons and enriched in carbon dioxide, said temperature and said pressure being so selected that said gaseous fraction comprises at least 50% of the aromatic hydrocarbons contained in said hydrogen sulfide-laden absorbent solution and at most 35% hydrogen sulfide contained in said hydrogen sulfide-laden absorbent solution, and d) thermally regenerating the absorbent solution depleted in aromatic hydrocarbon compounds so as to release a hydrogen sulfide-rich gaseous effluent and to obtain a regenerated absorbent solution.