Patent ID: 9539534
Date: 2017-01-10
CPC Classifications: B01D,B01J,C01B,C10G,C10K,Y02C,Y02P

Claim:
1. A method for recovering carbon monoxide and carbon dioxide from a gas mixture comprising 5-50 vol % methane, 10-50 vol % carbon dioxide, 20-65 vol % carbon monoxide, 10-40 vol % hydrogen and 10-55 vol % nitrogen, calculated on the total volume of the gas mixture, said method comprising, in sequence, the following steps: (1) feeding a gas mixture through a column comprising an adsorbent bed, said gas mixture comprising 5-50 vol % methane, 10-50 vol % carbon dioxide, 20-65 vol % carbon monoxide, 10-40 vol % hydrogen and 10-55 vol % nitrogen, calculated on the total volume of the gas mixture, the adsorbent bed comprising alumina, a carbon molecular sieve, silicalite, activated carbon, a zeolite, or mixtures thereof, (2) ceasing the feeding of the gas mixture comprising 5-50 vol % methane, 10-50 vol % carbon dioxide, 20-65 vol % carbon monoxide, 10-40 vol % hydrogen and 10-55 vol % nitrogen, and reducing the pressure in the column and the bed by about 5 to 25 bar a; and (3) rinsing the column and the adsorbent bed by feeding a gas comprising at least 70 vol % methane through the column and adsorbent bed, (4) pressurizing the column and adsorbent bed by about 5 to 25 bar a by feeding a gas comprising at least 70 vol % methane, (5) rinsing the column and the adsorbent bed by feeding a gas comprising at least 70 vol % methane through the column and adsorbent bed, (6) ceasing the feeding of a gas comprising at least 70 vol % methane and reducing the pressure of the column and adsorbent bed to a pressure in the range of 15 to 25 bar a; and (7) further reducing the pressure of the column and adsorbent bed to a pressure in the range of 1 to 5 bar a; and (8) rinsing the column and adsorbent bed by feeding a mixture of hydrogen and nitrogen through the column and adsorbent bed (9) pressurizing the column and adsorbent bed to a pressure in the range of 15 to 75 bar a by feeding a mixture of hydrogen and nitrogen.