To provide a carbon dioxide separation system with which it is possible to separate, with good efficiency, mixed gases having a wide range of pressures and carbon dioxide concentrations into high-concentration carbon dioxide gas and gas from which carbon dioxide has been removed.
By means of the carbon dioxide separation system, a mixed gas 1 having a carbon dioxide concentration of 3 to 75% is introduced to a primary carbon dioxide separator 4 having a zeolite membrane 5 for carbon dioxide separation and a primary permeating gas 6 having a carbon dioxide concentration of 80% or greater is produced on the permeation side of the zeolite membrane 5 while the carbon dioxide concentration of a primary gas 7 on the non-permeation side of the zeolite membrane 5 is reduced to 3 to 15%. Next, this primary gas 7 on the non-permeation side is introduced to a secondary carbon dioxide separator 8 by an amine absorption method or a pressure swing adsorption method PSA to produce a secondary separated gas 9 having a carbon dioxide concentration of 80% or greater that has been separated by the separator 8 and a gas 10 from which carbon dioxide has been removed having a carbon dioxide concentration of 2% or less. Preferably, the zeolite membrane 4 for carbon dioxide separation includes an FAU type zeolite membrane layer.
TAKAGI YOSHINOBU
ASARI YOSHIHIRO
| JP2008142709A | 2008-06-26 | |||
| JP2007307518A | 2007-11-29 | |||
| JP2005503260A | 2005-02-03 | |||
| JP2002201020A | 2002-07-16 | |||
| JP2009011980A | 2009-01-22 |
Einosuke Kishimoto
Akira Watanabe
Matsumura Naoto