FACILITATED TRANSPORT OF CO2 THROUGH AN IMMOBILIZED LIQUID MEMBRANE OF AQUEOUS DIETHANOLAMINE

Permeabilities and separation factors for the CO2-N2system have been experimentally determined for facilitated transport and separation through an immobilized liquid membrane (ILM) of an aqeuous solution of diethanolamine over a wide range of CO2partial pressures. Facilitated CO2transport in such a system has been modeled, and the set of coupled diffusion-reaction equations has been numerically solved. Experimentally obtained CO2-N2separation factors at 230-516 cmHg total pressures compare very well with model predictions over the whole range of CO2partial pressures. The effects of membrane thickness and downstream CO2partial pressure have been numerically studied. Improved knowledge and estimates of various physicochemical parameters will substantially improve the model capability for predicting species permeability. © 1990, American Chemical Society. All rights reserved.