Toshihiro Kamata

CO2 removal by hollow-fiber gas-liquid contactor

We have conducted a series of basic experiments for CO2 removal from the flue gas of thermal power plants by use of hollow-fiber gas-liquid contactors. It was confirmed that the stability of PTFE membrane having a high degree of hydrohobicity is more than 6,600 hours and that by improving the degree of hydrophobicity on the surface of the membrane, the durability and performance of the membrane can be improved. Furthermore, we have confirmed that flow characteristics of fluid in hollow-fiber can be estimated based on Hagen-Poiseuille law. The overall volumetric mass transfer coefficient Ka(=K×a) of the hollow-fiber gas-liquid contactor is more than 5 times larger than that of a conventional packed bed, which suggests that adoption of the present method has the advantage of making the absorber more compact.

Fixation of carbon dioxide by clathrate-hydrate

Abstract The influence of each parameter which control carbon dioxide (CO 2 ) clathrate formation is made clear by the apparatus, whose design pressure is 9.8 MPa. The sedimentation behavior of CO 2 clathrate is expected by the simulation, in order to estimate the time and the distance for the CO 2 clathrate particles to reach the bottom of sea. Based on these results and the future works, the fixation system of CO 2 will be conducted.

Dissolution and sedimentation behavior of carbon dioxide clathrate

Abstract To investigate a possibility of carbon dioxide (CO 2 ) clathrate for the fixation of CO 2 in the deep ocean, experiments for CO 2 clathrate formation, sedimentation and dissolution were performed at the temperatures from 277 to 290K, and the max pressure of 39MPa using pure water or artificial seawater. Furthermore, simulations for CO 2 sedimentation in the deep ocean and CO 2 diffusion from CO 2 lake at the bottom of the deep ocean were performed.

Fundamental Study on CO 2 Removal from the Flue Gas of Thermal Power Plant by Hollow-fiber Gas-Liquid Contactor

ABSTRACT Microporous membranes are suitable for the CO2-MEA (monoethanolamine) system because the overall mass transfer coefficient K of the membrane is approximately 10 times larger than that of composite membranes consisting of microporous membranes and homogeneous membranes. The overall volumetric mass transfer coefficient K• a of the hollow-fiber contactor is more than 5 times larger than that of a conventional packed bed, which suggests that adorption using the present method has the advantage of making the absorber more compact.

Extended CO2 Phase Analysis: Clathrates, Hydrates

ABSTRACT The influence of each parameter which controls carbon dioxide (CO2) clathrate formation is made clear by the apparatus, whose design pressure is 9.8 MPa and 39.2 MPa. And the influence of each parameter which controls CO2 clathrate sedimentation is made clear by the apparatus, whose design pressure is 39.2MPa. Based on these results and the future work, the fixation system of CO2 will be conducted.