Patent ID: 6913638
Filing Date: 2005-07-05
Classification: B01D,Y02C

Abstract:
1. A method for separating hydrogen gas from material gas using a plurality of adsorption towers each of which is loaded with an adsorbent and is provided with a product gas outlet, the method comprising: an adsorption step for adsorbing an unnecessary gas component contained in the material gas by the adsorbent for outputting hydrogen-rich product gas through the product gas outlet; a decompression step for reducing pressure in an adsorption tower; a desorption step for desorbing the unnecessary gas component from the adsorbent; a cleaning step for cleaning the adsorption tower by introducing cleaning gas into the adsorption tower; and a pressurizing step for raising pressure in the adsorption tower; one cycle comprising the adsorption step, the decompression step, the desorption step, the cleaning step and the pressurization step being repeated; wherein the decompression step includes introducing gas remaining in the adsorption tower into a selected adsorption tower as at least a part of the cleaning gas, the remaining gas being introduced in an amount 2 to 7 times a volume of the adsorbent loaded in the selected adsorption tower as converted into volume at common temperature and under atmospheric pressure.