Abstract: The present invention relates to an apparatus and method for recovering carbon dioxide (hereinafter also referred to as “CO2”) contained in a combustion exhaust gas, and more specifically relates to: an apparatus and method for reactively absorbing CO2 contained in a combustion exhaust gas into an amine compound-containing absorption liquid; an apparatus and method for desorbing CO2 contained in an amine compound-containing absorption liquid from the amine compound-containing absorption liquid; an apparatus and method for evaporating and separating impurities from the amine compound-containing absorption liquid containing the impurities; an apparatus and method for performing a pretreatment such as desulfurization, dust removal, and cooling on a combustion exhaust gas; and a carbon dioxide-recovering apparatus and method utilizing the above apparatuses and methods.

Abstract: The present invention relates to an apparatus and method for recovering carbon dioxide (hereinafter also referred to as “CO2”) contained in a combustion exhaust gas, and more specifically relates to: an apparatus and method for reactively absorbing CO2 contained in a combustion exhaust gas into an amine compound-containing absorption liquid; an apparatus and method for desorbing CO2 contained in an amine compound-containing absorption liquid from the amine compound-containing absorption liquid; an apparatus and method for evaporating and separating impurities from the amine compound-containing absorption liquid containing the impurities; an apparatus and method for performing a pretreatment such as desulfurization, dust removal, and cooling on a combustion exhaust gas; and a carbon dioxide-recovering apparatus and method utilizing the above apparatuses and methods.

Abstract: The invention aims to provide a method for regenerating a hydrogenation catalyst without using alkanes and a diolefin purification plant comprising an equipment which is used in this method and is simpler than ever. The first method comprises a contact step of contacting a composition for regeneration containing 50% by mass or more of an olefin having the carbon number of from 4 to 8 with the hydrogenation catalyst. The hydrogenation catalyst can be a hydrogenation catalyst used in hydrogenation of an acetylenic compound contained in a starting composition containing at least one diolefin having the carbon number of from 4 to 8. The second method comprises a contact step of contacting, with a hydrogenation catalyst, a raffinate obtained by separating, from a starting composition containing at least one diolefin having the carbon number of from 4 to 8, the diolefin. The hydrogenation catalyst can be a hydrogenation catalyst used in hydrogenation of the acetylenic compound contained in the starting composition.