US4078112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating modification process for ultrafiltration systems
Assignee: Union Carbide Corp
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Filing: 1976-07-12
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Granted: 1978-03-07
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Expires: 1996-07-12
Abstract
Abstract A coating modification process is provided for use in ultrafiltration systems to improve the adherence of porous coatings of preformed, aggregated, inorganic metal oxide particles, to substrates, particularly those comprised of hollow tubular porous carbon members. The process involves exposure of the coated members, during the initial treatment to water vapor at specific humidity, temperature and times. The ultrafiltration systems so treated are particularly well-suited for prolonged use in the concentration and separation of oil from mixtures of oil, water and detergents, the recovery of polyvinylalcohol from textile wastes, and other useful applications.
Inventors
- 👤 Alexander Armand Bibeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:33
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/14; B01D71/00; B01D71/02; B01D71/024
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A process for the stabilization of coatings of metal oxide particles on substrates which coated substrates are useful in ultrafiltration systems for the separation and concentration of components contained in liquids, said metal of said metal oxide being selected from the group consisting of one or more of beryllium, magnesium, calcium, aluminum, titanium, strontium, yttrium, lanthanum, zirconium, hafnium, thorium, iron, manganese and silicon, said process comprised of contacting the metal oxide coated substrate while still in the wet state and prior to its use for separating and concentrating components contained in liquids, with water vapor at a humidity of at least about 50 percent and at a temperature of at least about 80° C for a period of time sufficient to stabilize the metal oxide coating from any substantial erosion when employed for ultrafiltration purposes.
Claim 2
Dependent Claim
135 words
A process for the stabilization of coatings of metal oxide particles on substrates which coated substrates are useful in ultrafiltration systems for the separation and concentration of components contained in liquids, said metal of said metal oxide being selected from the group consisting of one or more of beryllium, magnesium, calcium, aluminum, titanium, strontium, yttrium, lanthanum, zirconium, hafnium, thorium, iron, manganese and silicon, said process comprised of contacting the metal oxide coated substrate while still in the wet state and prior to its use for separating and concentrating components contained in liquids, with water vapor at a humidity of at least about 50 percent and at a temperature of at least about 80° C for a period of time sufficient to stabilize the metal oxide coating from any substantial erosion when employed for ultrafiltration purposes.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said metal oxide is zirconia.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein said metal oxide is zirconia having a particle size within the range of from about 0.1 to about 1.0 microns.
Claim 5
Dependent Claim
36 words
The process of claim 1 wherein said substrate is comprised of tubular members having average pore diameters of at least 50 percent of which are within the range of from about 0.1 to about 0.50 microns.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein said tubular members are composed of carbon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |