The project 'Upgrading CO₂-rich gas streams of biogenic origin to valuable materials for the chemical industry through hydrogen sulphide separation' focuses on the development of an economically efficient and simultaneously ecologically beneficial process for the separation of low but harmful hydrogen sulphide (H₂S) contents from carbon dioxide containing gas streams. Such mixtures of substances are produced in large quantities during the purification of gaseous products from biomass fermentation and biomass gasification plants. The complete separation of H₂S is essential for the subsequent use of the gaseous products (biogas, synthesis gas, carbon dioxide) as a valuable energy source and raw material for the chemical industry. In the downstream processes, H₂S usually acts as an interfering substance or catalyst poison and prevents the further use of the intermediate products as an admixture. The central question of the project is therefore the development of an efficient process for the separation of small quantities of H₂S from CO₂-rich gas streams in order to enable the return and utilization of the bound carbon. The focus here lies on the use of particularly environmentally friendly reagents. Achieving high H₂S conversions with minimal carbon dioxide absorption through the targeted selection of reaction conditions such as temperature, pressure and the use of catalysts is thereby the main focus. The central development goals are the identification of a suitable reaction system and process engineering apparatus, the simulation and piloting of the process and the ecological and economic evaluation.