US3900457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization catalyst
Assignee: Phillips Petroleum Co
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Filing: 1970-10-08
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Granted: 1975-08-19
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Expires: 1990-10-08
Abstract
Abstract A method for preparing silica-containing olefin polymerization catalysts, and the process performable therewith, the preparation involving adding an alkali metal silicate to an acid under defined conditions of addition to produce a hydrogel, recovering the gel in the substantially dry condition by employment of an oxygenated organic compound and impregnating the gel with a chromium compound.
Inventors
- 👤 Donald R Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:59
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; C01B33/14; C01B33/152; C01B33/154; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A POLYMERIZATION CATALYST COMPRISING AN OXIDE OF CHROMIUM SUPPORTED ON A SILICA-CONTAINING COMPOSITION PREPARED BY: A. ADDING AN ALKALI METAL SILICATE TO AN ACIDE TO FORM A HYDROGEL, B. AGING THE HYDROGEL, C. WASHING THE AGED HYDROGEL TO PRODUCE A SUBSTANTIALLY ALKALI METAL-FREE HYDROGEL, D. FORMING A MIXTURE COMPRISING THE WASHED HYDROGEL AND A NORMALLY LIQUID OXYGEN-CONTAINING WATER-SOLUBLE ORGANIC COMPOUND, E. SEPARATING SAID ORGANIC COMPOUND AND WATER FROM SAID MIXTURE TO FORM A XEROGEL, AND F. RECOVERING SAID XEROGEL AS SAID SILICA-CONTAINING COMPOSITION,
Claim 2
Dependent Claim
83 words
A POLYMERIZATION CATALYST COMPRISING AN OXIDE OF CHROMIUM SUPPORTED ON A SILICA-CONTAINING COMPOSITION PREPARED BY: A. ADDING AN ALKALI METAL SILICATE TO AN ACIDE TO FORM A HYDROGEL, B. AGING THE HYDROGEL, C. WASHING THE AGED HYDROGEL TO PRODUCE A SUBSTANTIALLY ALKALI METAL-FREE HYDROGEL, D. FORMING A MIXTURE COMPRISING THE WASHED HYDROGEL AND A NORMALLY LIQUID OXYGEN-CONTAINING WATER-SOLUBLE ORGANIC COMPOUND, E. SEPARATING SAID ORGANIC COMPOUND AND WATER FROM SAID MIXTURE TO FORM A XEROGEL, AND F. RECOVERING SAID XEROGEL AS SAID SILICA-CONTAINING COMPOSITION,
Claim 3
Dependent Claim
26 words
A process which comprises polymerizing at least one olefin at a polymerization temperature up to about 500* F. with the polymerization catalyst defined in claim 1.
Claim 4
Dependent Claim
65 words
A polymerization catalyst comprising the composition defined in claim 1 in which: a. the pH of the hydrogel when formed is within the range of from about 3 to about 9; b. the hydrogel is aged for a period greater than one hour at a temperature within the range of from about 65* to about 200* F., and, c. said organic compound is ethyl acetate.
Claim 5
Dependent Claim
39 words
A process which comprises polymerizing at least one olefin at a polymerization temperature up to about 500* F. with a catalyst comprising an oxide of chromium supported on a silica-containing composition prepared according to the method of claim 3.
References Cited (Backward Citations)
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US2978298A
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US3127370A
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US3225023A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |