Patent ID: 7445649

Claim:
A process for producing a gas product from a carbonaceous fuel in a gasifier, the process comprising: in a first chemical process loop: oxidizing CaS in air within an oxidizer reactor to form hot CaSO 4 ; providing the hot CaSO 4 and a carbonaceous fuel to reducer reactor wherein the hot CaSO 4 and the carbonaceous fuel undergo an endothermic reaction utilizing heat content of the hot CaSO 4 to form CaS and syngas; providing the CaS to the oxidizer reactor for use in the oxidizing; and in a second chemical process loop: reacting CO of the syngas with gaseous H 2 O to produce H 2 and CO 2 in a shift reactor; capturing the CO 2 with CaO in an exothermic reaction to form hot CaCO 3 in the shift reactor; calcining the hot CaCO 3 to produce CO 2 and CaO using the heat content of the hot CaCO 3 in a calciner; and providing the Ca 0 from the calciner to the shift reactor for capituring of the CO 2 .