Syngas production by CO2 reduction process

Data di pubblicazione




Data di priorità



Politecnico di Milano


Department of Chemistry Materials and Chemical Engineering


Flavio Manenti, Sauro Pierucci (Politecnico di Milano), Lucio Molinari


The invention deals with a process to produce synthesis gas (syngas) by means of the reaction of the reduction of CO2 with H2S, which are both generated or separated in purification processes, at a relatively high temperature to allow the partial reduction of CO2 according to the following general reaction R: R: 2CO2+2H2S2CO+2H2+0.5S2+SO2 Since such a reaction R is globally endothermic, it is necessary to supply energy to the reaction system and it can be carried out according to 2 alternatives: • Without the use of O2 or air, in a furnace with one or more coils heated by radiating walls or directly; the reaction R takes place inside the coil • In presence of O2 or air in a thermal or regenerative reactor: In both the cases, the SO2 obtained as by-product from the reaction R can be converted in elemental sulfur by means of conventional Claus technologies, leading to the global reaction R1: R1: CO2+2H2SCO+H2+S2+H2O The invention deals with the chemical procedure as well as with the related production unit to generate syngas and/or sequestrating CO2 and/or H2S.

Campo di applicazione

The invention/apparatus can be applied, but not limited, to: • Syngas production with H2/CO ratio relatively high and, therefore, close to the required feed for chemical compounds such as ammonia, methanol, gas-to-liquid, coal-to-liquid, coal/biomass gasification, power generation, etc. • Sequestration of CO2 and/or H2S with high conversion yield (for natural gas plants, oil refineries, oil wells, desulfurization, gasification).


• Completely removal of H2S. • Cut of CO2. • Production of syngas from two wastes (CO2 and H2S). • Reduction of environmental impact. • Increase of the performance and profit of sulfur recovery units, coal/biomass gasifiers, and processes that produce/use syngas. • Reduction of energy consumption. • Hydrogen production. • Production of chemical commodities using CO2 as feedstock.