Abstract
An experimental device is described for the measurement at low pressure of different transport phenomena in membranes. The water permeability was measured in 15 cellulose acetate membranes, using cellulose acetate with a degree of acetilation of 2.7. The manufacture of membranes was based on solutions of cellulose acetate in acetone, whose composition varied in the range of 35 to 110 mg of cellulose acetate in 25 cm 2 of acetone. The maximal pressure difference was 50 cm of water and the temperatures were made to vary from 30 to 50°C. A significant correlation between temperature and permeability was found. This dependence can be described either by exponential or linear equations with practically the same degree of accuracy.
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