US3867306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization composition
Assignee: Phillips Petroleum Co
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Filing: 1973-09-17
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Granted: 1975-02-18
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Expires: 1993-09-17
Abstract
Abstract A chromium-containing xerogel, suitable for employment in a composition comprising a polymerization catalyst, is produced by incorporating the chromium in the hydrogel and separating water therefrom.
Inventors
- 👤 Donald R Witt
- 👤 Benny E Nasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:18
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C08; C08F; C08F110/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A METHOD OF PREPARING A CHROMIUM-CONTAINING SILICA COMPOSITION COMPRISING: .A. ADDING AN ALKALI METAL SILICATE TO AN ACID TO FORM A HYDROGEL; B. AGING THE HYDROGEL FOR GREATER THAN ONE HOUR; C. WASHING THE AGED HYDROGEL TO PRODUCE A SUBSTANTIALLY ALKALI METAL-FREE HYDROGEL; D. INCORPORTING AN AQUEOUS SOLUTION OF SAID CHROMIUMCONTAINING COMPOUND INTO SAID THUS WASHED HYDROGEL; E. FORMING A MISTURE COMPRISING SAID WASHED HYDROGEL AND A NORMALLY LIQUID, OXYGEN-CONTAINING, WATER-SOLUBLE ORGANIC COMPOUND CAPABLE OF AIDING IN REMOVING WATER; F. THEREAFTER SEPARATING SAID ORGANIC COMPOUND AND SAID WATER FROM SAID MIXTURE TO FORM A XEROGEL; AND 1 G. RECOVERING SAID XEROGEL AS SAID CHROMIUM-CONTANING SILICA COMPOSITION.
Claim 2
Independent Claim
106 words
A METHOD OF PREPARING A CHROMIUM-CONTAINING SILICA COMPOSITION COMPRISING: .A. ADDING AN ALKALI METAL SILICATE TO AN ACID TO FORM A HYDROGEL; B. AGING THE HYDROGEL FOR GREATER THAN ONE HOUR; C. WASHING THE AGED HYDROGEL TO PRODUCE A SUBSTANTIALLY ALKALI METAL-FREE HYDROGEL; D. INCORPORTING AN AQUEOUS SOLUTION OF SAID CHROMIUMCONTAINING COMPOUND INTO SAID THUS WASHED HYDROGEL; E. FORMING A MISTURE COMPRISING SAID WASHED HYDROGEL AND A NORMALLY LIQUID, OXYGEN-CONTAINING, WATER-SOLUBLE ORGANIC COMPOUND CAPABLE OF AIDING IN REMOVING WATER; F. THEREAFTER SEPARATING SAID ORGANIC COMPOUND AND SAID WATER FROM SAID MIXTURE TO FORM A XEROGEL; AND 1 G. RECOVERING SAID XEROGEL AS SAID CHROMIUM-CONTANING SILICA COMPOSITION.
Claim 3
Dependent Claim
23 words
A method according to claim 1 wherein said chromium is in or is convertible to the hexavalent state upon addition to said hydrogel.
Claim 4
Dependent Claim
13 words
A method according to claim 1 wherein said chromium-containing compound is chromium trioxide.
Claim 5
Dependent Claim
14 words
A method according to claim 1 wherein said water-soluble organic compound is ethyl acetate.
Claim 6
Dependent Claim
13 words
A method according to claim 1 wherein said acid contains a titanium compound.
Claim 7
Dependent Claim
21 words
A method according to claim 1 wherein said water-soluble organic compound is ethyl acetate and said chromium-containing compound is chromium trioxide.
Claim 8
Dependent Claim
12 words
A method according to claim 6 wherein said acid is sulfuric acid.
Claim 9
Dependent Claim
13 words
A method according to claim 7 wherein said acid contains a titanium compound.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |