日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

In japan, a variety of studies such as chemical absorption processes and fixed bed adsorption processes have been done recently for the recovery of CO₂ from fossil fuel combustions to prevent the earth from warming up.

In power plants an enormous amount of gas should be treated continuously using very large sized unit. Chiyoda has developd a CFB-PTSA (Circulating Fluidized Bed Pressure and Thermal Swing Adsorption) Process for CO₂ recovery from power plant flue gas jointly with Hokuriku Electric Power Co. The process is easy to scale up without mechanical complexities. The performance of the process has been verified by a bench scale plant since 1991.

CO₂ in the flue gas is continuously adsorbed by circulating fluidized zeolite particles in atmospheric pressure and desorbed in reduced pressure. Furthermore, the process utilizes not only the pressure difference but also the temperature difference between the adsorbing section and the desorbing section. The process is highly advantageous to Fixed Bed P(T)SA processes.