| 摘要 |
The invention provides a gas separation method and apparatus that can recover efficiently principal gas components from a feed gas that includes a plurality of components, and enables supplying the product gases continuously at a stable flow rate and component concentration. In the present invention, a first separation step using a first adsorption column and a second separation step using a second adsorption column are provided, a circulating feed gas, which is consisting of the recovered exhaust gases discharged in each of the steps and the feed gas, is used as a gas to be separated, the outflow rate and component concentration of a second gas product are maintained at a constant by controlling the outflow rate of the first gas product.
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