Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1989-08-25
1990-11-06
Jones, W. Gary
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
210492, 21049701, 21050023, 21050025, 21050026, 210506, 2105101, 427244, 427246, 427247, 4273762, 427380, 4273835, B01D 6700, B01D 6904, B01D 7102
Patent
active
049684264
ABSTRACT:
Strong and durable alpha alumina ultrafiltration membranes with effective separating layers having effective pore diameters less than about 50 nm, and particularly at almost any point within the range of about 10 to about 50 nm, can be produced by seeding boehmite sols with appropriate seeds, such as very fine alpha alumina with a specific surface area of more than 100 sq. m. per g, gelling a thin layer of the sol by contact with a microfilter support, drying the gel, followed by controlled heating of the coated support both to convert the boehmite to alpha alumina and to simultaneously control the effective pore diameter of the resultant membrane.
REFERENCES:
patent: 4069157 (1978-11-01), Hoover et al.
patent: 4412921 (1983-11-01), Leung et al.
patent: 4562021 (1985-12-01), Alary et al.
patent: 4623364 (1986-11-01), Cottringer
patent: 4689150 (1987-08-01), Abe et al.
Leenaars et al., "Porous Alumina Membranes", Chemtech, 9/1986, pp. 560-564.
McArdle et al., "Seeding with Gamma-Alumina . . . ", Journal of American Ceramic Society, vol. 69, No. 5, pp. C98-C101 (1986).
Leenaars et al., "The Preparation and Characterization of Alumina Membranes . . . ", J. Materials Science, pp. 1077-1088, (1984).
Wilson et al., "The Porosity of Aluminum Oxide . . . ", 82 J of Colloid and Interface Science, pp. 507-517 (1981).
Jones W. Gary
Loiselle, Jr. Arthur A.
Norton Company
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