Patent ID: 6780396
Filing Date: 2004-08-24
Classification: C01B,Y02E

Abstract:
In a process for the production of a gas that contains hydrogen from a feedstock consisting essentially of hydrogen sulfide, comprising at least the following stages:(1) generating from the feedstock a gaseous effluent that contains at least hydrogen and elementary sulfur, (2) condensing and separating the elementary sulfur from the gaseous effluent and recovering a gaseous effluent that contains hydrogen, the improvement in stage (1) comprising:a stage for heating the feedstock that contains the H2S in at least one heating zone to a temperature T1 of between 1300Â° C. and 1600Â° C. so as to generate a hot gas that contains at least hydrogen and elementary sulfur, obtained by decomposition of the H2S, said heating being carried out at least in part by an external heat source, a stage for quick cooling of the thus obtained hot gas, comprising mixing the hot gas with a fluid EQ at a temperature T2, so as to obtain the gaseous effluent at a temperature T3 of between ambient temperature and 900Â° C., under conditions such that the mixing time between the hot gas at temperature T1 and fluid FQ at temperature T2 is less than 5 milliseconds, so as to recover at least 80% of the hydrogen that is formed at equilibrium at reaction temperature T1, and wherein the stage for quick cooling of the hot gas at temperature T1 by mixing with fluid FQ is carried out with an ejector overating with a motive fluid and a draw-in gas, wherein fluid FQ is the motive fluid and the hot gas at temperature T1 is the fluid that is drawn in.