Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1986-11-07
1988-10-25
Sever, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210654, 210708, 210799, 210DIG5, B01D 1300
Patent
active
047802111
ABSTRACT:
Membranes of highly crystalline PTFE having an average pore size between about 0.01 micron and about 0.5 micron ordinarily reject any passage of water while allowing an organic nonpolar liquid to flow therethrough. By thoroughly wetting an expanded polytetrafluroethylene membrane with isopropyl alcohol, such a membrane will selectively allow the passage of a polar liquid, for example water, therethrough while rejecting other components, including nonpolar organic liquids, such as oil, kerosene or the like, and dissolved components of fairly large molecular size. Such IPA-wetted membranes are used to separate oil-water mixtures by allowing the water to selectively permeate through the membrane. The membrane may include a 5 mil thick backing layer of nonwoven synthetic fibers. The mixture is supplied to the membrane at a pressure not greater than about 90 psig., and often very low pressures of about 5-20 psig. can be used.
REFERENCES:
patent: 3342729 (1967-09-01), Strand
patent: 3367504 (1968-02-01), Westmoreland
patent: 3542203 (1970-11-01), Hancock et al.
patent: 3554378 (1971-01-01), Kohl
patent: 3616929 (1971-11-01), Manjikian
patent: 3682318 (1972-08-01), Rigopulos
patent: 3715036 (1973-02-01), Hamer
patent: 3737043 (1973-06-01), Clark
patent: 3872014 (1975-03-01), Schell
patent: 3880739 (1975-04-01), Leavitt
patent: 3953566 (1976-04-01), Gore
patent: 4187390 (1980-02-01), Gore
patent: 4201664 (1980-05-01), Hekal
patent: 4332686 (1982-06-01), Gerlach et al.
patent: 4439322 (1984-03-01), Sonoda et al.
patent: 4525374 (1985-06-01), Vaillancourt
Zahka, J. et al., "Ultrafiltration of Latex Emulsions", Chem. Eng. Proc., Dec. 1977, pp. 53-55.
Reprint of ICI Engineering Plastics, No. 4, 1975, entitled "Gore-Tex* Expanded PTFE; A Porous and Versatile Structure of Fluon.RTM. PTFE".
Desalination Systems Inc.
Sever Frank
LandOfFree
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