US3864282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zeolitic porous refractory oxide particles
Assignee: Union Oil Company of California
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Filing: 1973-01-08
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Granted: 1975-02-04
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Expires: 1993-01-08
Abstract
Abstract Refractory oxide particles having average diameters below 1,000 A are prepared by very rapid heating at rates in excess of 1*F per millisecond to temperatures in excess of about 1,000*F. The particles should be heated through a temperature differential of at least about 500*F. Zeolites having extremely small crystal sizes can be made by this procedure.
Inventors
- 👤 Dean Arthur Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:45
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/10; B01J29/14; B01J29/146; Y; Y10; Y10S; Y10S423/00; Y10S423/21; Y10S423/24; Y10S423/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
THE METHOD OF REDUCING THE PARTICLE SIZE OF A ZEOLITIC REFRACTORY OXIDE HAVING A SURFACE AREA OF AT LEAST ABOUT 100 SQUARE METERS PER GRAM INCLUDING THE STEPS OF HEATING SAID OXIDE AT AN AVERAGE RATE OF AT LEAST ABOUT 0.5*F PER MILLISECOND TO A TEMPERATURE OF AT LEAST ABOUT 1,000*F OVER A TEMPERATURE DIFFERENTIAL OF AT LEAST 500*F SUFFICIENT TO REDUCE THE AVERAGE PARTICLE SIZE OF SAID OXIDE.
Claim 2
Independent Claim
69 words
THE METHOD OF REDUCING THE PARTICLE SIZE OF A ZEOLITIC REFRACTORY OXIDE HAVING A SURFACE AREA OF AT LEAST ABOUT 100 SQUARE METERS PER GRAM INCLUDING THE STEPS OF HEATING SAID OXIDE AT AN AVERAGE RATE OF AT LEAST ABOUT 0.5*F PER MILLISECOND TO A TEMPERATURE OF AT LEAST ABOUT 1,000*F OVER A TEMPERATURE DIFFERENTIAL OF AT LEAST 500*F SUFFICIENT TO REDUCE THE AVERAGE PARTICLE SIZE OF SAID OXIDE.
Claim 3
Dependent Claim
53 words
The method of claim 1 wherein said refractory oxide is a crystalline aluminosilicate zeolite having an initial average particle size above about 1000 A and is heated to said temperature at a rate in excess of about 1*F. per millisecond, sufficient to reduce said average particle size to less than about 1000 A.
Claim 4
Dependent Claim
106 words
The method of claim 2 wherein said zeolite has an initial surface area of at least about 400 square meters per gram, said temperature differential is at least about 100*F., said zeolite is heated at a rate of at least about 5*F. per millisecond by mixing a fluidized stream of said zeolite and a fluidizing gas with a preheated fluid stream having a temperature above about 1000*F., and said conditions of heating rate and temperature are correlated to produce a product having an average particle size of less than about 500 A diameter and a surface area of at least about 400 square meters per gram.
Claim 5
Dependent Claim
67 words
The method of claim 3 wherein said zeolite has a faujasite crystal structure, a silica-to-alumina ratio of at least about 3, a sodium content of less than about 3 weight percent Na2O and at least one other catIon selected from hydrogen, polyvalent metal ions and hydrogen precursor ions convertible to hydrogen at elevated temperatures, and said zeolite is heated to a temperature of at least about 1400*F.
Claim 6
Dependent Claim
23 words
The method of claim 2 wherein said oxide contains at least about 3 weight percent volatile matter vaporizable at said temperature above 1,000*F.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein said zeolite is oxide comprises an ammonium exchanged faujasite zeolite containing less than 3 weight percent Na2O.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |