Patent US3862104A successfully refreshed from Google Patents.
US3862104A
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Large pore silica gel catalysts
Assignee: Phillips Petroleum Co
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Filing: 1973-10-15
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Granted: 1975-01-21
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Expires: 1993-10-15
Abstract
Abstract A method of producing the silica-containing support for a polymerization catalyst which involves precipitating the silica hydrogel employing an ammonium salt and removing the water from the hydrogel by employing an oxygen-containing organic compound.
Inventors
- 👤 Donald R Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:50
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
The method of claim 1 wherein said chromium compound is introduced into said substantially water-free silica-containing composition after said azeotropic distillation.
Claim 2
Dependent Claim
27 words
The method of claim 2 in which said chromium compound is introduced into said water-free silica-containing composition by impregnating same with a hydrocarbon solution of tertiary butyl-chromate.
Claim 3
Dependent Claim
29 words
The method of claim 2 in which said salt is selected from the group consisting of ammonium nitrate, ammonium sulfate, ammonium chloride, ammonium fluoride, ammonium fluoborate and ammonium silicofluoride.
Claim 4
Dependent Claim
44 words
The method of claim 4 in which silica hydrogel is produced at a pH within the range of from about 3 to about 10, the silicon dioxide content of said gel being within the range of from about 2 to about 12 weight percent.
Claim 5
Dependent Claim
31 words
The method of claim 4 in which said solution of said alkali metal silicate or said solution comprising an ammonium salt contains a titanium compound reducible to the oxide upon calcination.
Claim 6
Dependent Claim
13 words
The method of claim 4 in which said ammonium salt is ammonium sulfate.
Claim 7
Dependent Claim
19 words
The method of claim 6 in which said ammonium salt is ammonium sulfate and said titanium compound is K2TiO(C2H4)2.2H2O.
References Cited (Backward Citations)
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US3801705A
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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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |