Patent ID: 8137439

Claim:
A process for the recovery of CO 2 from a flue gas, comprising, a) compressing a flue gas to a first pressure, b) cooling the flue gas to a first temperature, c) adsorbing CO 2 in a first adsorbent bed, wherein said first adsorbent bed is at said first temperature and said first pressure, wherein said first adsorbent bed is isothermally maintained by a first cooling means, d) pressurizing said first adsorbent bed to a second pressure with CO 2 at a second temperature, wherein said second pressure is greater than said first pressure, wherein said second temperature is greater than said first temperature, e) heating said first adsorbent bed to a third temperature with a first heating means, thereby increasing said first adsorbent bed to a third pressure, wherein said third temperature is greater than said second temperature, wherein said third pressure is greater than said second pressure, thereby releasing a first portion of adsorbed CO 2 , f) lowering the pressure of said first adsorbent bed in at least one more stage, while said first adsorbent bed is isothermally maintained at said third temperature by a second heating means, thereby releasing at least a second portion of adsorbed CO 2 , g) cooling the released CO 2 with at least a second cooling means, h) sending said cooled CO 2 to one or more surge drums, i) purging said first adsorption bed with a N2 stream, simultaneously cooling said first adsorption bed with a third cooling means, j) compressing said cooled CO 2 from said surge drums in a multi-stage compressor, wherein the pressure of the CO 2 from each surge drum is approximately equal to the inter-stage pressure into which it is admitted, and k) regenerating said first adsorption bed with a N2 stream, wherein said regeneration stream is heated by a third heating means.