NOVELTY - An adsorption column is filled with the adsorption agent. The component exhibiting high adsorbability and component exhibiting less adsorbability from source gas are separated with respect the adsorption agent by using the adsorption column. The temperature of adsorption agent filled in adsorption column is set more than the maximum environmental temperature around the adsorption column.    USE - Pressure-fluctuation adsorption type gas-separation method for use in apparatus for manufacturing semiconductor product such as semiconductor integrated circuit, liquid crystal panel, solar cell panel and magnetic disk, for separating high-value-added gas such as xenon and krypton from mixed gas.    ADVANTAGE - The change of the adsorption characteristic can be suppressed even if the environmental temperature around the gas-separation apparatus is changed. The variation of position of the adsorption zone within the adsorption column can be avoided. The rare high-value added gas with high purity can be separated easily from the source gas. The energy consumption can be reduced. The gas recovery cost can be reduced.    DETAILED DESCRIPTION - The adsorption column has the lower pipes (10B,11B) and the top pipes (10U,11U). The temperature of the top pipe is less than the temperature of the lower pipe. An INDEPENDENT CLAIM is included for pressure-fluctuation adsorption type gas-separation apparatus, which has a heating apparatus that heats the top and lower pipes. The heating apparatus is controlled. The temperature control apparatus sets the temperature of adsorption agent filled in adsorption column more than the maximum environmental temperature around the adsorption column and controls temperature of the top pipe to be less than the temperature of the lower pipe.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the high-value-added gas recovery apparatus.    Source gas storage tank (1)    High adsorbability component storage tank (2)    Less adsorbability component storage tank (3)    Compressors (4,5)    Lower pipes (10B,11B)    Top pipes (10U,11U)