Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1983-02-02
1984-09-25
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
2105002, B01D 1300
Patent
active
044734760
ABSTRACT:
A porous glass membrane for reverse osmosis desalination of salt water is made by heating a membrane of a sodium-boron-alumino silicate glass so that it separates into two inter-connecting phases, removing one phase to make the membrane porous, and then coating the pores with a metal oxide to modify the pore size distribution and strengthen the membrane to enable it to withstand the high pressure applied in the reverse osmosis process. The porous glass is first treated with a volatile metal chloride such as titanium chloride, and the resulting surface layer is hydrolyzed to produce the metal oxide coating. A further reduction in pore size with an accompanying increase in strength can be made by partially sintering the treated membrane.
REFERENCES:
patent: 3926799 (1975-12-01), Thomas et al.
patent: 3972721 (1976-10-01), Hammel et al.
Marcinkowsky et al., "Hyperfiltration Studies . . . Oxide Membranes", from J. Am. Chem. Soc., 88:24, 12-66, pp. 5744-5746.
Ceramic Bulletin, vol. 57, No. 11, Nov. 1978, T. H. Elmer, Evaluation of Porous Glass as Desalination Membrane, pp. 1051-1054.
Maddison Ronald
McMillan Peter W.
National Research Development Corporation
Spear Frank
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