US4130505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two stage activation of fluorided chromium-containing catalyst
Assignee: Phillips Petroleum Co
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Filing: 1974-09-26
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Granted: 1978-12-19
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Expires: 1994-09-26
Abstract
Abstract Catalyst is produced by first activating a chromium-containing silicon-containing support at calcination temperature, treating with a fluoride compound and thereafter heating at a lower temperature of 300° to 1000°F for about 1 to 20 hours. Catalysts thus produced are of particular utility in the production of narrow molecular weight distribution ethylene polymers.
Inventors
- 👤 Benny E. Nasser, Jr.
- 👤 Richard E. Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:20
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/22; B01J37/26; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
53 words
A process for producing a catalyst comprising: calcining a chromium-containing silicon-containing support; cooling said thus calcined support and incorporating therewith a fluorine-containing compound; and thereafter heating said support containing said fluorine-containing compound at a temperature within the range of 300° to 1000°F, which temperature is lower than the temperature used for said calcining.
Claim 2
Dependent Claim
53 words
A process for producing a catalyst comprising: calcining a chromium-containing silicon-containing support; cooling said thus calcined support and incorporating therewith a fluorine-containing compound; and thereafter heating said support containing said fluorine-containing compound at a temperature within the range of 300° to 1000°F, which temperature is lower than the temperature used for said calcining.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein said silicon-containing support is one of silica, silica-alumina, or silica-titania.
Claim 4
Dependent Claim
21 words
A method according to claim 1 wherein said calcining is done at a temperature within the range of 900° to 1700°F.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein said calcining is done under an atmosphere of flowing dry air.
Claim 6
Dependent Claim
36 words
A method according to claim 1 wherein said heating of said fluorine-containing support is done at a temperature within the range of 450° to 750°F for a time within the range of 1 to 20 hours.
Claim 7
Dependent Claim
52 words
A method according to claim 5 wherein said silicon-containing support is one of silica, silica-alumina, or silica-titania, and wherein said calcining is carried out at a temperature within the range of 900° to 1700°F for a time within the range of 1/2 to 50 hours under an atmosphere of flowing dry air.
Claim 8
Dependent Claim
27 words
A method according to claim 6 wherein said chromium containing support is formed by treating silica, silica-alumina, or silica-titania with an aqueous solution of a chromium compound.
Claim 9
Dependent Claim
44 words
A method according to claim 6 wherein said fluorine containing compound is one of ammonium silicofluoride or ammonium fluoroborate and is incorporated by introducing said compound in the form of a powder to said calcined support while maintaining an atmosphere of fluidizing dry air.
Claim 10
Dependent Claim
22 words
A method according to claim 6 wherein said silicon-containing support is formed by coprecipitating an alkali metal silicate and a titanium compound.
Claim 11
Dependent Claim
64 words
A method according to claim 9 wherein said chromium is introduced into silicon-containing support by treating said support with a solution of a chromium compound convertible to chromium oxide on calcination and said fluorine-containing compound is incorporated by introducing a powdered anhydrous fluoride selected from ammonium silicofluoride and ammonium fluoroborate while fluidizing air from said calcining is still flowing through the cooled calcined base.
Claim 12
Dependent Claim
6 words
A catalyst according to claim 1.
Claim 13
Dependent Claim
6 words
A catalyst according to claim 10.
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US3887494A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |