| 초록 |
A membrane vacuum stripping process was applied to the desorption process for the purpose of desorption energy reduction in an amine absorption process. Composite membranes with a PDMS(polydimethylsiloxane) dense layer on a PE(polyethylene) support layer were prepared by a casting method and used as a membrane contactor for CO2 stripping. Aqueous amine solutions of 30 wt% MEA (monoethanolamine), DEA (diethanolamine) and TEA (triethanolamine) were used as absorbents. CO2 flux was examined under various operating conditions by varying the vacuum pressure, stripping temperature, CO2 loading and type of amine solution. CO2 stripping flux increased with increasing temperature and CO2 loading as well as decreasing vacuum pressure. CO2 stripping flux was higher in the TEA and DEA solutions than in the MEA solution. PDMS-PE composite membrane has long term stability for vacuum stripping process compared with PTFE porous membrane. |
