US3961036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina synthesis
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1974-01-04
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Granted: 1976-06-01
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Expires: 1994-01-04
Abstract
Abstract High surface area alumina materials, which are particularly effective catalyst supports or carriers, are prepared by heating alumina monohydrate, alumina trihydrate or mixtures thereof from 450 DEG -500 DEG to at least 800 DEG F in the presence of excess elemental chlorine. The heating of the alumina material with elemental chlorine is conducted prior to said alumina material being heated to a temperature above about 450 DEG -500 DEG F in the absence of elemental chlorine. The alumina monohydrate or trihydrate compositions are derived from the aqueous phase reaction of ethylene oxide with aluminum chloride and/or aluminum hydroxychloride.
Inventors
- 👤 Glen P. Hamner
- 👤 William J. Mattox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:26
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
A method for preparing an alumina having a surface area ranging from about 375 to 580 m 2 /gm (BET) which comprises reacting ethylene oxide with aluminum chloride, aluminum hydroxychloride or mixtures thereof to obtain a raw alumina product comprised of alumina monohydrate, alumina trihydrate or mixtures thereof, and heating said raw alumina, prior to calcination at temperatures in excess of 450°F, from 500°F to at least 800°F in the presence of excess elemental halogen.
Claim 2
Independent Claim
75 words
A method for preparing an alumina having a surface area ranging from about 375 to 580 m 2 /gm (BET) which comprises reacting ethylene oxide with aluminum chloride, aluminum hydroxychloride or mixtures thereof to obtain a raw alumina product comprised of alumina monohydrate, alumina trihydrate or mixtures thereof, and heating said raw alumina, prior to calcination at temperatures in excess of 450°F, from 500°F to at least 800°F in the presence of excess elemental halogen.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein the halogen is chlorine.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein said heating is conducted from 450°F to at least 800°F.
Claim 5
Dependent Claim
21 words
The method of claim 2 wherein the product of the heating step is calcined at temperatures ranging from 800°F to 1000°F.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein said alumina product is the product of the reaction of ethylene oxide with aluminum chloride.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |