Osmotic distillation process and semipermeable barriers therefor
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United States of America Patent
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-
Mar 24, 1992
Grant Date -
N/A
app pub date -
Nov 4, 1988
filing date -
May 5, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a semipermeable barrier for osmotic distillation, having a semipermeable matrix of an externally hydrophobic, high thermal conductibility material having a thickness of less than 50 microns, preferably less than 20 microns, a minimum porosity of 50% of the surface area and pore dimensions such that the flux is proportional to the pore radius (Knudsen) or to the square of the pore radius. Concentration of a dilute solution of low osmotic pressure is accomplished by the process of contacting the barrier on a first side with fluid of a first osmotic pressure and on the second side with fluid of a lower osmotic pressure, whereby the concentration of the fluid of lower osmotic pressure is increased due to the difference in osmotic pressure between the two fluids.
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