Abstract
Using a high pressure test cell with windows, laser interference patterns in a 62 mg/1 NaCl solution adjacent to the membrane were photographed after the establishment of steady state for 30 atm. constant applied pressure. The mathematical solution of the concentration profile was, with ray tracing, analytically fitted to the experimental interference pattern. From this analysis at 28 ± l°C and 30 atm. pressure, an intrinsic sail rejection of R - 0.86 ± 0.02 and reduced permeation flux of v - 100 cm−1 for the DDS-990 cellulose acetate membrane was obtained. Limitations of the method, sensitivity and accuracy of the results are also discussed.
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