Abstract: The present invention relates to the use of an aqueous solution as a carbon dioxide absorbent, the aqueous solution containing a tertiary dialkylalkanolamine as a primary absorbent, a secondary alkanolamine as a rate enhancer, and polyalkylene glycol monomethyl ether as a regeneration promoter. The alkanolamine-based carbon dioxide absorbent containing polyalkylene glycol monomethyl ether and the carbon dioxide absorption method and separation method using same, according to the present invention, not only have an excellent carbon dioxide absorption capacity and a rapid carbon dioxide absorption rate, but also have a remarkably low absorbent regeneration temperature compared with a conventional alkanolamine-based absorbent and thus can significantly reduce the entire energy consumption required for an absorption process, and can also prevent recovered carbon dioxide from being contaminated with moisture and absorbent vapor, owing to the low regeneration temperature.

Abstract: A sulfur dioxide absorbent comprising an ionic liquid comprised of alkyl ether-substituted imidazolium cation and an alkanesulfonate anion moieties possesses a high thermal/chemical stability, high SO2 absorption rate and low regeneration temperature, and is useful for an effective separation of SO2 from a combustion exhaust gas mixture or the like.

Abstract: The present invention relates to a method of purifying olefin, the method comprising removing a small amount of acetylenic compounds contained in olefin by using pyrrolidinium-based or piperidinium-based ionic liquid mixtures comprising copper (I) halide. According to the method of the present invention, copper (I) halide is stabilized by pyrrolidinium-based or piperidinium-based ionic liquids, suppressing the oxidation of Cu(I) into Cu(II), whereby the capacity of removing acetylenic compounds can be maintained for a long time and the selective removal rate of acetylenic compounds to olefin can be significantly improved. In addition, since the ionic liquid mixtures comprising copper (I) halide used in the method of the present invention can be applied to both absorption and extraction processes, it can effectively remove acetylenic compounds from olefin in a more simple and economical way compared to the existing adsorption and membrane separation processes.

Abstract: A sulfur dioxide absorbent comprising an ionic liquid comprised of alkyl ether-substituted imidazolium cation and an alkanesulfonate anion moieties possesses a high thermal/chemical stability, high SO2 absorption rate and low regeneration temperature, and is useful for an effective separation of SO2 from a combustion exhaust gas mixture or the like.

Abstract: The present invention relates to a method of purifying olefin, the method comprising removing a small amount of acetylenic compounds contained in olefin by using pyrrolidinium-based or piperidinium-based ionic liquid mixtures comprising copper (I) halide. According to the method of the present invention, copper (I) halide is stabilized by pyrrolidinium-based or piperidinium-based ionic liquids, suppressing the oxidation of Cu(I) into Cu(II), whereby the capacity of removing acetylenic compounds can be maintained for a long time and the selective removal rate of acetylenic compounds to olefin can be significantly improved. In addition, since the ionic liquid mixtures comprising copper (I) halide used in the method of the present invention can be applied to both absorption and extraction processes, it can effectively remove acetylenic compounds from olefin in a more simple and economical way compared to the existing adsorption and membrane separation processes.