Patent ID: 8361428
Filing Date: 2013-01-29
Classification: C10J,C10L,F01K,Y02E,Y02P

Abstract:
1. A process for generating steam and a plurality of gaseous products from a carbonaceous feedstock and recovering carbon dioxide, the process comprising the steps of: (a) supplying a first carbonaceous feedstock to a reactor, the reactor in communication with a gasifier; (b) at least partially combusting first carbonaceous feedstock in the reactor to generate (i) heat energy and (ii) a first gas stream comprising carbon dioxide; (c) utilizing the heat energy to generate steam; (d) introducing at least a portion of the steam, the first gas stream, a second carbonaceous feedstock, and an alkali metal gasification catalyst to a gasifier; (e) reacting the second carbonaceous feedstock in the gasifier in the presence of the steam and the alkali metal gasification catalyst and under suitable temperature and pressure to form a second gas stream comprising a plurality of gaseous products comprising methane, carbon dioxide and one or more gases selected from the group consisting of hydrogen, carbon monoxide, hydrogen sulfide, ammonia and other higher hydrocarbons; (f) at least partially separating the plurality of gaseous products to produce (i) a third gas stream comprising carbon dioxide and (ii) a fourth gas stream comprising a predominant amount of one of the gaseous products other than carbon dioxide; (g) recovering the third gas stream; and (h) recovering the fourth gas stream, wherein the third gas stream includes carbon dioxide formed in steps (b) and (e).