Gas transport in combined membrane system with moving liquid carrier

摘要

The study of selective membrane valve (SMV)-the membrane system which consists of two polymeric membranes and a layer of liquid between them (moving or non-moving) is presented in this paper. Permeability of pure gases such as oxygen, carbon dioxide and hydrogen are investigated. Distilled water and aqueous solutions of potassium carbonate were used as liquid carriers. Aqueous potassium carbonate was used as chemical absorbent of carbon dioxide. The dependencies of gas transport parameters of SMV on water flow rate and potassium carbonate concentration have been obtained. Two models of gas transport in membrane system were developed. A first model describes SMV with flowing physical liquid absorbent, the second one-with non-moving chemical liquid absorbent. The first model was found to be in good agreement with experimental results for hydrogen. Carbon dioxide permeability through SMV with potassium carbonate aqueous solution is well described by the second model. The increasing of the time-lag of non-steady state permeability process of carbon dioxide when concentration of chemical absorbent increases was also demonstrated by the second model.