| abstract |
GAS CLEANING METHOD Abstract The rate of gas extraction from a gas purifier using a PSA is improved, and a high degree of purification and high extraction speed are achieved with good productivity. The present invention is directed to a gas purification method using a PSA method, in which a carbon molecular sieve having a pore volume at a pore diameter of 0.38 nm or more, not exceeding 0.05 cm3 / g, and a volume pores, at a pore diameter of 0.34 nm, 0.15 cm3 / g or more, in the pore diameter distribution measured by the MP method, is used as an adsorbent, and during the adsorption step, foreign gas is adsorbed from the source gas by bringing the source gas into contact with adsorbent for 10 seconds or more and 6000 seconds or less to obtain concentrated methane. |