CO2 loaded absorbent was regenerated by reducing pressure with hydrophobic microporous polyrpropylene hollow fiber membrane. An aqueous solution of 2M 2-amino-2-methyl-1-propanol(AMP) was used as CO2 loaded absorbent. Desorption experiments were carried out at various temperatures, pressures, and CO2 loadings. The effects of these operating conditions on overall mass transfer coefficient were investigated. The overall mass transfer coefficients increased with decreasing CO2 loading and increasing absorbent temperature. Rate of CO2 desorption increased with decreasing the pressure of the shell side. Rates of water vaporization were also obtained. The comparison of water vaporization rate with CO2 desorption rate shows that the process is operated most energy-effectively at the vapor pressure of water. The determined overall mass transfer coefficients were much lower than those theoretically calculated for completely non-wetted pore for aqueous absorbent indicating that the pores are partially wetted.