Patent ID: 8956441
Filing Date: 2015-02-17
Classification: B01D,C10G,C10K

Abstract:
1. A method for producing a gas comprising at least 80 vol % carbon monoxide, calculated on the total volume of the gas, 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, (2) ceasing the feeding of the gas mixture comprising methane, carbon dioxide, carbon monoxide and hydrogen, and reducing the pressure in the column and the bed with about 5 to 10 bar a; and (3) rinsing the column and the adsorbent bed by feeding a gas comprising at least 95 vol % methane, or a gas mixture of methane and carbon dioxide, through the column and adsorbent bed, (4) ceasing the feeding of a gas comprising at least 95 vol % methane, or a gas mixture of methane and carbon dioxide, and reducing the pressure of the column and adsorbent bed to a pressure in the range of 1 to 5 bar a; and (5) rinsing the column and adsorbent bed by feeding a mixture of hydrogen and nitrogen through the column and adsorbent bed (6) 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.