| Description |
80 pages. |
| Summary |
"A new method of desalination using a porous, water-repellent membrane was studied. The membrane utilized surface forces to support a vapor phase in its pores which separated the salt water from fresh water. The method used a vapor pressure difference across the membrane as the driving force for mass transfer of water from the salt water phase to the fresh water. This vapor pressure difference was obtained by maintaining a temperature difference between the two liquid phases. The experimental data and results indicated the feasibility of vaporization through porous, water-repellent membranes. The flux of water through a membrane made of fiber glass and teflon was found to be essentially directly proportional to the vapor pressure driving force. The over-all mass transfer coefficient values obtained for the membrane were studied as functions of the driving force and log-mean partial pressure of air in the pores. These values were found to be independent of the driving force across the membrane and essentially independent of log-mean partial pressure of air in the pores. The range of over-all mass transfer coefficients obtained for the membrane under consideration was 0.17 to 0. 30 lb./hr.sq.ft.In.Hg. corresponding to fluxes of 0.24 to 2.47 lb./hr.sq.ft"--Abstract. |
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