| 摘要 |
A process for separating carbon monoxide with substantially constant purity from a feed gas containing at least carbon dioxide, carbon monoxide and nitrogen through pressure swing adsorption (PSA) in a two-stage adsorption operation which comprises a first adsorption stage for removing CO2 and a second adsorption stage for recovering CO; the second adsorption stage repeating at least a step of pressurizing the column, a step of adsorbing carbon monoxide, and a step of desorbing the carbon monoxide, characterized in that the CO concentration in the feed gas, the CO concentration in the effluent gas withdrawn from the first adsorption stage, or the CO concentrations in both gases are monitored, and when the CO concentration in the feed gas or effluent gas decreases below a definite amount, part of the CO product gas is circulated into the feed gas, the effluent gas, or both gases. |
