US3898322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina having a binodal pore volume distribution
Assignee: Vista Chemical Co
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Filing: 1972-12-15
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Granted: 1975-08-05
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Expires: 1992-12-15
Abstract
Abstract Alpha alumina monohydrate having a cumulative pore volume from about 1.0 to about 3.0 cc/g wherein from about 20 to about 40 percent of said cumulative pore volume consists of pores having a pore diameter from about 40 to about 100 A and wherein from about 20 to about 40 percent of said cumulative pore volume consists of pores having a pore diameter from about 250 to about 800 A and a method for preparing such alumina.
Inventors
- 👤 Bruce E Leach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14; C01P2006/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
A METHOD FOR PRODUCING ALPHA ALUMINA MONOHYDRATE HAVING A CUMULATIVE PORE VOLUE 0-10,000A FROM ABOUT 1.0 TO ABOUT 3.0 CC/G WHEREIN FROM ABOUT 20 TO ABOUT 40 PERCENT OF SAID CUMULATIVE PORE VOLUME CONSISTS OF PORES HAVING A PORE DIAMETER FROM ABOUT 40 TO ABOUT 100 A AND WHEREIN FROM ABOUT 20 TO ABOUT 40 PERCENT OF SAID CUMULATIVE PORE VOLUME CONSISTS OF PORES HAVING A PORE DIAMETER FROM ABOUT 250 TO ABOUT 800 A, SAID METHOD CONSISTING ESSENTIALLY OF SEQUENTIALLY: A. HYDROLYZING SOLID ALUMINUM ALKOXIDES WITH WATER HAVING A PH FROM ABOUT 4 TO ABOUT 10 TO PRODUCE AN AQUEOUS ALUMINA SLURRY AND ALCOHOL, B. MIXING SAID AQUEOUS ALUMINA SLURRY WITH AN ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF ACETONE, METHANOL, ETHANOL, PROPANOL, ISOPROPANOL, BUTANOL, ISOBUTANOL AND TERITARY BUTANOL IN AN AMOUNT SUFFICIENT TO FORM AN AZEOTROPIC MIXTURE WITH THE WATER PRESENT IN SAID AQUEOUS ALUMINA SLURRY TO FORM A SOLVENT-AQUEOUS ALUMINA MIXTURE AND C. DRYING SAID MIXTURE TO PRODUCE SAID ALPHA ALUMINA MONOHYDRATE.
Claim 2
Independent Claim
166 words
A METHOD FOR PRODUCING ALPHA ALUMINA MONOHYDRATE HAVING A CUMULATIVE PORE VOLUE 0-10,000A FROM ABOUT 1.0 TO ABOUT 3.0 CC/G WHEREIN FROM ABOUT 20 TO ABOUT 40 PERCENT OF SAID CUMULATIVE PORE VOLUME CONSISTS OF PORES HAVING A PORE DIAMETER FROM ABOUT 40 TO ABOUT 100 A AND WHEREIN FROM ABOUT 20 TO ABOUT 40 PERCENT OF SAID CUMULATIVE PORE VOLUME CONSISTS OF PORES HAVING A PORE DIAMETER FROM ABOUT 250 TO ABOUT 800 A, SAID METHOD CONSISTING ESSENTIALLY OF SEQUENTIALLY: A. HYDROLYZING SOLID ALUMINUM ALKOXIDES WITH WATER HAVING A PH FROM ABOUT 4 TO ABOUT 10 TO PRODUCE AN AQUEOUS ALUMINA SLURRY AND ALCOHOL, B. MIXING SAID AQUEOUS ALUMINA SLURRY WITH AN ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF ACETONE, METHANOL, ETHANOL, PROPANOL, ISOPROPANOL, BUTANOL, ISOBUTANOL AND TERITARY BUTANOL IN AN AMOUNT SUFFICIENT TO FORM AN AZEOTROPIC MIXTURE WITH THE WATER PRESENT IN SAID AQUEOUS ALUMINA SLURRY TO FORM A SOLVENT-AQUEOUS ALUMINA MIXTURE AND C. DRYING SAID MIXTURE TO PRODUCE SAID ALPHA ALUMINA MONOHYDRATE.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said pH is from about 4 to about 6.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein aqueous alumina slurry is aged after hydrolysis for at least 2 hours.
Claim 5
Dependent Claim
19 words
The method of claim 3 wherein said aqueous alumina slurry is aged from about 2 to about 60 hours.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein said aqueous alumina slurry is aged after hydrolysis for at least 24 hours.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |