Patent ID: 7909898

Claim:
A method of treating a gaseous mixture comprising hydrogen (H 2 ), carbon dioxide (CO 2 ) and at least one combustible gas selected from the group consisting of hydrogen sulfide (H 2 S), carbon monoxide (CO) and methane (CH 4 ), said method comprising: separating H 2 from said gaseous mixture to produce a separated H 2 gas and a crude CO 2 gas comprising said combustible gas(es); combusting in a first combustor at least a portion of said combustible gas(es) in at least a portion of said crude CO 2 gas in the presence of oxygen (0 2 ) to produce heat and a CO 2 product gas comprising combustion products of said combustible gas(es), wherein the purity of the CO 2 product gas is greater than or equal to 90 mol % CO 2 on a dry basis without further purification; recovering at least a portion of said heat from at least a portion of said CO 2 product gas by indirect heat exchange with at least a portion of said separated H 2 gas or a gas derived therefrom to produce warmed H 2 -containing gas and cooled CO 2 product gas; compressing an air stream in a compressor; feeding at least a portion of the compressed air stream into a second combustor; feeding at least a portion of the warmed H 2 -containing gas into the second combustor to produce a resultant high temperature flue gas; feeding at least a portion of the resultant high temperature flue gas from the second combustor into an expander for power generation, wherein the CO 2 product gas or a stream derived therefrom, is compressed to pipeline pressure of about 80 bar to about 250 bar.