INVESTIGATION OF THE CONCENTRATION DRIVEN PERMEATION OF DILUTED SO2, NO2 AND CO IN SILICON ORGANIC MEMBRANES PREPARED BY PLASMA POLYMERIZATION

The gas permeation properties of plasma polymerized membranes - prepared from hexamethyldisiloxane and hexamethyldisilazane and silicone rubber membranes on porous supports of polyetherimide for mixtures of SO2, NO2 and CO diluted in N-2 were investigated. For the measurement of the concentration driven permeation of gas mixtures in membranes, an arrangement for infrared gas analysis is presented, allowing the simultaneous measurement of several gases on the feed and on the permeate side of the membrane. With the plasma polymer films substantially higher separation factors of diluted SO2/CO and NO2/CO were obtained than with silicone rubber. Using hexamethyldisiloxane as monomer for the plasma polymerization process resulted in high permeation rates and high selectivities.