US3974101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization catalyst
Assignee: Phillips Petroleum Co
•
Filing: 1974-09-16
•
Granted: 1976-08-10
•
Expires: 1994-09-16
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
2026-10-31 22:29
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; C01B33/14; C01B33/152; C01B33/154; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/513
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A method of preparing a silica-containing composition comprising: a. adding an alkali metal silicate to an acid selected from sulfuric acid and carbonic acid 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; f. recovering said xerogel as said silica-containing composition, and g. impregnating said silica-containing xerogel composition with a chromium compound convertible to chromium oxide.
Claim 2
Independent Claim
97 words
A method of preparing a silica-containing composition comprising: a. adding an alkali metal silicate to an acid selected from sulfuric acid and carbonic acid 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; f. recovering said xerogel as said silica-containing composition, and g. impregnating said silica-containing xerogel composition with a chromium compound convertible to chromium oxide.
Claim 3
Dependent Claim
33 words
The method of claim 1 in which sodium silicate is added to sulfuric acid to produce said hydrogel and said organic compound and said water are separated from said mixture by azeotropic distillation.
Claim 4
Dependent Claim
49 words
The method of claim 2 in which said sodium silicate is added to said acid at a rate such that from about 0.1 to about 15 weight percent of the total weight of sodium silicate is added per minute of addition time to form a gel comprising hydrated silica.
Claim 5
Dependent Claim
33 words
The method of claim 2 in which said oxygen-containing organic compound is selected from the group consisting of methyl isobutyl ketone, ethyl acetate, sec-butyl alcohol, n-propyl alcohol, butyraldehyde, diisobutyl ether, and isopropyl acetate.
Claim 6
Dependent Claim
32 words
The method of claim 3 in which said hydrogel contains between about 3 and about 12 weight percent silica and the pH of said gel is between about 3 and about 9.
Claim 7
Dependent Claim
50 words
The method of claim 5 in which said oxygen-containing organic compound is selected from the group consisting of methyl isobutyl ketone, ethyl acetate, sec-butyl alcohol, n-propyl alcohol, butyraldehyde, diisobutyl ether, and isopropyl acetate and said azeotropic mixture has a boiling point temperature below the boiling point of said organic compound.
Claim 8
Dependent Claim
57 words
The method of claim 1 in which water-glass is added to sulfuric acid at a temperature between about 40° and about 110°F. at an average rate of addition of between about 0.25 and about 2.2 weight percent of the total water glass added per minute to form a hydrogel, and said mixture is formed with ethyl acetate.
Claim 9
Dependent Claim
33 words
The method of claim 1 in which sodium silicate is added to sulfuric acid to produce said hydrogel, and said hydrogel is washed with an oxygen-containing compound to remove water from said hydrogel.
Claim 10
Dependent Claim
56 words
The method of claim 1 in which the pH of the hydrogel when formed is within the range of from about 3 to about 9, the hydrogel is aged for a period greater than one hour at a temperature within the range of from about 65°F. to about 200°F., and said organic compound is ethyl acetate.
References Cited (Backward Citations)
US2429319A
Cited
US2978298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |