Patent ID: 6942842
Filing Date: 2005-09-13
Classification: B01D,C01B,Y02P

Abstract:
1. A process for the preparation of a CO gas that is low in sulfur, comprising: a) feeding continuously a CO gas containing sulfur compounds that are gaseous under the process conditions to a conversion stage at temperatures of more than 280° C. and with a steam content of at least about 2.5 wt. % (based on CO gas), such that organic sulfur compounds contained in the CO gas are converted on an aluminum oxide contact to hydrogen sulfide and carbon dioxide, b) feeding continuously the CO gas containing the sulfur compounds so converted to a chemical absorption stage, wherein the hydrogen sulfide contained in the CO gas is converted on an iron-hydroxide-containing, porous material, in the presence of oxygen and water, into iron sulfide and elemental sulfur and is absorbed, c) feeding continuously the CO gas so desulfurised to an activated carbon adsorption stage for the removal of traces of hydrogen sulfide and optionally other sulfur compounds, such that some of the sulfur compounds still contained in the CO gas is converted in the presence of ammonia and traces of oxygen into water-soluble ammonium compounds.