| 摘要 |
PURPOSE:To recover high-purity CO stably from feed gas, by measuring the concentrations of CO2 and N2 in the feed gas, controlling the amount of waste gas in the adsorption process or the amount of purge gas used in the purge process according to the concentrations, and carrying out the concentration and separation of CO. CONSTITUTION:An adsorbent capable of selectively adsorbing CO2 is packed in the adsorption columns A and B, and the column A is evacuated after purging. The pressure in the column A is raised to the adsorption pressure, and the feed gas is passed through the column A. After the adsorption process for a prescribed period, the pressure in the column A is released to atmospheric pressure or thereabout to effect the desorption of CO2 adsorbed to the adsorbent. The waste gas sent from the second-stage treatment apparatus is introduced into the column A under reduced pressure to purge the adsorbed CO2, and the column A is transferred to the next step after the completion of the purging process. The above operations are repeated alternately in the columns A and B to effect the continuous adsorption and removal of CO2 with the adsorbent. Separately, the product gas free from CO2 and ejected from the top of the columns A, B in the first-stage treatment is introduced into the second-stage treatment apparatus to remove H2 and N2, and is recovered as the highly concentrated CO gas. |
