PURIFICATION OF ORGANIC COMPOUNDS BY MEMBRANE PERMEATION
IONICS INC CAMBRIDGE MASS
Pagination or Media Count:
Polypropylene and several modifications of polyethylene films were selected as the first membranes to be examined. Permeation runs and selectivity for several binary mixtures through polypropylene and medium density polyethylene are given. Heptane was used as the standard for comparision in each case, and permselectivity and rate were determined for its binary mixture with pentane, dodecane, hexene, cyclohexane, cyclohexene, cyclohexene, benzene, and di-n-butyl ether. Analyses of charge and permeate mixtures were done by vapor phase chromatography. In all pairs of experiments except the cyclohexaneheptane runs, the average permeation rate was at least 3-fold faster through polyethylene than through polypropylene. For the pentane-heptane binary, the permeate pressure had a marked affect n the permselectivity.