Separation of Gases by Fractional Permeation through Membranes

Abstract

The permeability of a number of thin organic films toward oxygen and nitrogen has been measured. For an ethyl cellulose film the studies were extended to include CO2, A, He, and H2. The enrichment of a binary gas mixture in a single stage of permeation has been calculated for the extreme cases of perfect mixing and no mixing. Application of these results indicates that the use of a fractional permeation process may be of practical importance in effecting the separation of oxygen from air, helium from natural gas, and hydrogen from coke-oven gas, as examples.

Gas permeability of a novel cellulose membrane

“…In the "dry" state, the permeation rates of CO 2 , H 2 , N 2 , CH 4 , O 2 , He and Ar in the cellulose membranes of this work were measured by the variable volume method between 25 and 80 • C and at gas pressures up to 1 MPa [26]. The "dry" cellulose membrane shows very low absolute permeability, which is similar to that of Cellophane membrane [7,27]. The gas permeability coefficient, in particular for He and H 2 , is less than 10 −12 ml(STP) cm cm −2 s −1 cmHg −1 .…”

Analysis of equilibrium shift in isothermal reactors with a permselective wall

“…The gas composition here is calculated by assuming cross flow-i.e., plug flow--on the reaction side and well mixed on the permeation side (Weller and Steiner, 1950).…”

Removal of CO2 from Natural Gas Using Membrane Separation System: Modeling and Process Design

“…Thus the composition of permeate can be determined at any point along the membrane by the relative permeation rates of feed component at that point (Weller and Steiner, 1950;Geankoplis, 2003).…”