HIGH-EFFICIENCY SEPARATION OF AN ETHYLENE ETHANE MIXTURE BY A LARGE-SCALE LIQUID-MEMBRANE CONTACTOR CONTAINING FLAT-SHEET NONPOROUS POLYMERIC GAS-SEPARATION MEMBRANES AND A SELECTIVE FLOWING-LIQUID ABSORBENT

Ethylene and ethane were effectively separated from a mixture comprisi ng these two gases by means of a large-scale liquid-membrane contactor (membrane permabsorber). The contactor comprised composite flat-sheet membranes with a nonporous diffusional layer made from polyblock copo lymer poly(dimethylsiloxane)/poly(phenylsilsesquioxane) and an aqueous solution of silver nitrate flowing along turbulence-promoter spacers between the membranes. The membrane permabsorber permitted ethylene an d ethane to be separated effectively from a binary mixture. The proble m with the selection of suitable membranes is discussed. It was shown that the efficiency of the separation process could be varied by chang ing the liquid-flow rate, the membrane area, the concentration of the selective carrier in the liquid, the temperature of the liquid absorbe nt, and the gas-separation properties of the membranes.