| 摘要 |
<p>A product gas (Gpro) is separated from a raw material gas (Gmat) by the PSA method with a plurality of adsorption columns (A-C) filled with an adsorbing agent. The separation of the product gas (Gpro) is carried out by repeating a cycle consisting of an absorption step, a pressure reduction step, a desorption step, a washing step and a pressure elevation step. In the pressure reduction step, a remaining gas (Grem) is introduced from an adsorption column (C) to another adsorption column (B) as a washing gas. The remaining gas (Grem) is introduced in a volume 2 to 7 times that of the adsorbing agent charged in the adsorption column (B), in terms of that at room temperature and under atmospheric pressure. For the purpose of removing both of carbon monoxide and carbon dioxide from a raw material gas (Gmat) by using one type of adsorbing agent, use is made of a zeolite which has been exchanged with lithium in a proportion of 95 % and has a faujasite structure of a Si/Al ratio of 1 to 1.5.</p> |
