Molecular design for permselective membranes of hydrocarbons in aqueous chemical waste water

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Pervaporation enrichment of organic compounds from dilute aqucous solutions has been investigated because of the solution of serious environmental problem about water. Especially, a high removal of chlorinated hydrocarbons and phenol from water has been expected. Therefore, in this work, a separation of these chemicals was studied using polymeric membranes. As co-monomers, n-butyl acrylate (n-BA), which has organic permselectivity, and (trimethylsilyl) metyl methacrylate (TMSMMA), which has a trimethylsilyl group on the side chain, were used. The separation of chlorinated hydrocarbons from aqucous solutions was attempted through the copoly (TMSMMA-n-BA) membranes. The flux increased with the increase of n-BA content and the maximum separation factor 600 of organic/water was obtained in the separation of 1,1,2-trichloroethane aqueous solution through the copoly (TMSMMA-n-BA) membrane which the n-BA content was 70mol%. The separation of phenol from its aqueous solution was also attempted. The separation behavior however not clear. Then, the dependence of separation factor on temperature was studied using the polyetherbrockamide membrane. The separation factor for organic/water increased with the increase of the temperature. From these results, 3-methacryloxypropyl tris (trimethylsiloxy)-silane (SiMA), which has high permeability, TMSMMA and stirene, which are predicted phenol selectivity, were used as co-monomers. The separation of phenol from its aqueous solutions was carried out through the copoly (SiMA-TMSMMA) and the copoly (SiMA-Stirene) membranes. The maximum separation factor 20 of organic/water was obtained through the poly SiMA membrane. There was the maximum point in the relationship between the flux and TMSMMA or stirene content. These resuluts were discussed by the effect of the grass trasition temperature, the degree of swelling and the structure of monomer.