Patent ID: 7993431
Filing Date: 2011-08-09
Classification: B01D,Y02C

Abstract:
1. A method for gas purification that uses a gas purification apparatus comprising a purifier in which a gas-purifying agent is packed, the method comprising: feeding a gas into the purifier so that impurities in the gas are removed by a thermal swing adsorption method, wherein an amount A of the gas-purifying agent is determined such that an impurities-removing capacity possessed by half of the amount A of the gas-purifying agent is equal to the total amount of impurities in the gas to be purified in one purification step, the amount A or more and no more than 1.4 A of the gas-purifying agent is packed in the purifier to form a gas-purifying agent layer, and the gas velocity at the inlet of a layer of the gas-purifying agent is set within a range from 0.25 to 0.4 m/s to form a mass transfer zone and no adsorption equilibrium region in the whole region of the gas-purifying agent layer in the gas purification step; wherein, in the case where a purification step time is referred to as T, a gas velocity at the inlet of a gas-purifying agent layer is referred to as u, an equilibrium adsorption amount of the gas-purifying agent is referred to as q, and a conversion factor is referred to as α, the packed height H of the gas-purifying agent layer is determined by the following equation (1):