Patent US3898321A successfully refreshed from Google Patents.
US3898321A
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Preparation of macroporous, heat-stable titania having high pore volume
Assignee: KEMIRA Inc A GA CORP
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Filing: 1973-02-28
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Granted: 1975-08-05
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Expires: 1993-02-28
Abstract
Abstract There is provided heat-stable, macroporous titania having high pore volumes and a process for preparing the same by feeding two separate streams of titanic sulfate and ammonium hydroxide solutions or their equivalents to a rapidly stirred ''''heel'''' of water while adjusting the proportions of titanic sulfate and ammonium hydroxide so as to maintain a constant pH in the water ''''heel'''' in the range from about 4.0 to about 8. There is then recovered by decantation, filtration or other suitable means a hydrous, macroporous titania precipitate which is next washed free of sulfate ions, then oven dried or spray dried to remove the excess water and, finally, calcined at temperatures up to 900*C.
Inventors
- 👤 Christopher Herbert Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:51
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/06; B01J21/063; C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01G23/0532; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/13; C01P2006/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A PROCESS FOR PREPARING HEAT-STABLE, MACROPOROUS TITANIA WHICH CONSISTS IN THE STEPS OF: FEEDING TWO SEPARATE STREAMS OF AQUEOUS TITANIC SULFATE AND AMMONIUM HYDROXIDE, RESPECTIVELY, INTO A VIGOROUSLY STIRRED AQUEOUS HEEL CONSISTING OF WATER, ADJUSTING THE PROPORTIONS OF THE STREAMS SO AS TO MAINTAIN A PH RANGING FROM ABOUT 4.0 TO 8, EFFECTING CONTINUOUS PRECIPITATION OF A HYDROUS, TITANIA PRECIPITATE, WATER WASHING THE RESULTANT PRECIPITATE UNTIL FREE FROM SULFATE ION, DRYING THE SO-WASHED PRECIPITATE, CALCINING THE SAME AT A TEMPERATURE RANGING FROM 300*C. TO 900*C., AND RECOVERING A MACROPOROUS, HEAT-STABLE TITANIA HAVING BOTH (A) HIGH PORE VOLUMES RANGING FROM 1.10 ML./G. TO 0.40 ML./G. AND (B) THE MAJORITY OF THE PORE VOLUME IN PORES GREATER THAN 100 A RADIUS WHEN CALCINED AT TEMPERATURES RANGING BETWEEN 600*C. AND 900*C.
Claim 2
Dependent Claim
128 words
A PROCESS FOR PREPARING HEAT-STABLE, MACROPOROUS TITANIA WHICH CONSISTS IN THE STEPS OF: FEEDING TWO SEPARATE STREAMS OF AQUEOUS TITANIC SULFATE AND AMMONIUM HYDROXIDE, RESPECTIVELY, INTO A VIGOROUSLY STIRRED AQUEOUS HEEL CONSISTING OF WATER, ADJUSTING THE PROPORTIONS OF THE STREAMS SO AS TO MAINTAIN A PH RANGING FROM ABOUT 4.0 TO 8, EFFECTING CONTINUOUS PRECIPITATION OF A HYDROUS, TITANIA PRECIPITATE, WATER WASHING THE RESULTANT PRECIPITATE UNTIL FREE FROM SULFATE ION, DRYING THE SO-WASHED PRECIPITATE, CALCINING THE SAME AT A TEMPERATURE RANGING FROM 300*C. TO 900*C., AND RECOVERING A MACROPOROUS, HEAT-STABLE TITANIA HAVING BOTH (A) HIGH PORE VOLUMES RANGING FROM 1.10 ML./G. TO 0.40 ML./G. AND (B) THE MAJORITY OF THE PORE VOLUME IN PORES GREATER THAN 100 A RADIUS WHEN CALCINED AT TEMPERATURES RANGING BETWEEN 600*C. AND 900*C.
Claim 3
Dependent Claim
20 words
The process according to claim 1 wherein the pH of the aqueous heel is maintained between 4.5 and 6.5 6.5.
Claim 4
Dependent Claim
14 words
The process according to claim 1 wherein the calcining temperature is maintained at 600*C.
Claim 5
Dependent Claim
14 words
The process according to claim 2 wherein the calcining temperature is maintained at 900*C.
Claim 6
Dependent Claim
28 words
The process according to claim 1 wherein the drying of the so-washed precipitate is carried out by spray drying the same at a temperature of at least 110*C.
Claim 7
Dependent Claim
28 words
The process according to claim 1 wherein the drying of the so-washed precipitate is carried out by oven drying the same at a temperature of at least 110*C.
References Cited (Backward Citations)
US2553402A
Cited
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 |