| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an apparatus for separating carbon dioxide, in which a facilitated transport membrane for CO<SB>2</SB>, which can exhibit satisfactory membrane performance at high temperature of 100°C or higher and under pressure, is used. <P>SOLUTION: The apparatus for separating carbon dioxide is constituted so that a gaseous raw material, which contains carbon dioxide and water vapor at the least in a predetermined principal component gas, is supplied to the raw material-side surface of the facilitated transport membrane 10 for CO<SB>2</SB>at the supply temperature of 100°C or higher and the carbon dioxide permeated through the facilitated transport membrane 10 for CO<SB>2</SB>is withdrawn from the permeation-side surface of the membrane 10. The facilitated transport membrane 10 for CO<SB>2</SB>is formed by adding 2,3-diaminopropionic acid to a gel membrane of a polyvinyl alcohol-polyacrylic acid copolymer. A pressure regulating means 15 is arranged for controlling the total pressure of the gaseous raw material to be supplied to the facilitated transport membrane for CO<SB>2</SB>to be equal to or higher than the pressure satisfying the lower limit degree of water vapor saturation to be set within 0.3-0.6 and be equal to or lower than the pressure satisfying the degree of water vapor saturation of 1 when the degree of water vapor saturation is defined as a ratio obtained by dividing the water vapor partial pressure in the gaseous raw material by the saturated water vapor pressure to be decided at the supply temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT |
