| 摘要 |
PURPOSE:To prepare CO from a CO-containing gaseous mixture according to a pressure variation type adsorbing method, by using two or more of adsorbing towers packed with a moisture adsorbent and a CO-selective adsorbent from the stock gas introducing side of an adsorbing tower. CONSTITUTION:Stock gas is successively introduced into adsorbing towers A, B to adsorb CO while other gases are exhausted. After the adsorbing process is finished, the adsorbing towers are released under reduced pressure. In the next step, evacuating exhausion is performed and CO2 is desorbed and, thereafter, the tower is purged by the waste gas of a N2-removal apparatus and pressurized to adsorbing pressure at last by product gas. The gas, from which CO2 is removed, is introduced into an adsorbing tower C under pressure to adsorb CO and CO2 while waste gas is used as the above mentioned purge gas. A moisture adsorbent is received in the lower part of the adsorbing tower. After the adsorbing process is finished, the adsorbing tower C is evacuated while discharge gas is adsorbed with an adsorbing tower D and, after a purge process is finished, said tower D is exhausted under reduced pressure by a water seal type vacuum pump to recover CO as product gas. |
