Journal of Chemical and Engineering Data, Vol.51, No.5, 1587-1592, 2006
Adsorption rate of ethanol on activated carbon fiber
We have measured experimentally the adsorption kinetics of ethanol on pitch-based activated carbon fibers (ACFs) of type (A-20) at different adsorption temperatures ranging from 27 to 60 degrees C, which are suitable for adsorption chiller design. These data are unavailable in the literature. The mass uptake of ethanol adsorbed on ACF is measured by a thermogravimetric analyzer (TGA) under a controlled pressure and temperature environment. The uptake mass and temperature measurements are logged with a time interval of 0.5 s making a continuous change of ethanol mass uptake with time. System pressure is kept constant during the adsorption experiments and the adsorption rate of the ACF (A-20)/ethanol pair is estimated within the concentration range of 0.1 and 0.5 kg of adsorbate/kg of ACF. A comparison between the experimentally measured data and the predicted results of adsorption rate shows a good agreement, demonstrating the adsorption rate is mainly controlled by surface diffusion.