Patent US3950316A successfully refreshed from Google Patents.
US3950316A
Expired / Lapsed
US
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Catalyst support formed by adding acidic material to silica containing titanium
Assignee: Phillips Petroleum Co
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Filing: 1974-05-03
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Granted: 1976-04-13
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Expires: 1994-05-03
Abstract
Abstract Olefin polymers are made using a chromium oxide catalyst on a support formed by adding an acidic material to a silicate solution containing titanium. This catalyst is capable of producing a polymer of an olefin having a high melt index and is of particular utility in the production of such polymer in a particle-form process.
Inventors
- 👤 Donald R. Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:24
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
115 words
A method of preparing a silica-containing catalyst support comprising: a. mixing a water soluble titanium compound with an alkali metal silicate solution, said titanium compound being non-reactive with said silicate; b. adding an acidic material to said silicate solution containing said titanium compound to form a hydrogel; c. aging said hydrogel for a time greater than 1 hour; d. washing said thus aged hydrogel with either an ammonium salt solution or a dilute acid to produce a substantially alkali metal-free hydrogel; e. forming a mixture comprising said thus washed hyrogel and a normally liquid oxygen-containing, water soluble organic azeotrope-forming compound; and f. separating said organic compound and water from said mixture to form a xerogel.
Claim 2
Independent Claim
115 words
A method of preparing a silica-containing catalyst support comprising: a. mixing a water soluble titanium compound with an alkali metal silicate solution, said titanium compound being non-reactive with said silicate; b. adding an acidic material to said silicate solution containing said titanium compound to form a hydrogel; c. aging said hydrogel for a time greater than 1 hour; d. washing said thus aged hydrogel with either an ammonium salt solution or a dilute acid to produce a substantially alkali metal-free hydrogel; e. forming a mixture comprising said thus washed hyrogel and a normally liquid oxygen-containing, water soluble organic azeotrope-forming compound; and f. separating said organic compound and water from said mixture to form a xerogel.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein said xerogel is heated to a temperature within the range of 500° to 2000°F for a time within the range of 1/2 to 50 hours.
Claim 4
Dependent Claim
13 words
A method according to claim 2 wherein said acid contains a chromium-containing compound.
Claim 5
Dependent Claim
20 words
A method according to claim 2 wherein said hydrogel is impregnated with a chromium-containing compound prior to forming said xerogel.
Claim 6
Dependent Claim
17 words
A method according to claim 4 wherein said chromium compound is an aqueous solution of chromium trioxide.
Claim 7
Dependent Claim
25 words
A method according to claim 2 wherein said xerogel is impregnated with a chromium compound prior to heating to said temperature of 500° to 2000°F.
Claim 8
Dependent Claim
17 words
A method according to claim 6 wherein said chromium compound is a hydrocarbon solution of t-butyl chromate.
Claim 9
Dependent Claim
20 words
A method according to claim 2 wherein said non-reactive titanium-containing compound is a compound convertible to titanium oxide upon calcination.
Claim 10
Dependent Claim
15 words
A method according to claim 2 wherein said acidic material is a sulfuric acid solution.
Claim 11
Dependent Claim
23 words
A method according to claim 2 wherein said non-reactive titanium compound is K 2 TiO(C 2 O 4 ) 2 .2H 2 O.
Claim 12
Dependent Claim
35 words
A method according to claim 2 wherein said silicate solution is sodium silicate of the formula xNa 2 O.ySiO 2 wherein the ratio of y to x is within the range of 1.5:1 to 3.8:1.
Claim 13
Dependent Claim
10 words
A catalyst support produced by the method of claim 1.
Claim 14
Dependent Claim
10 words
A catalyst produced according to the method of claim 4.
Claim 15
Dependent Claim
10 words
A catalyst produced according to the method of claim 5.
Claim 16
Dependent Claim
126 words
A process which comprises contacting an olefin with a catalyst comprising an activated chromium oxide supported on a silica-containing base prepared by: a. mixing a water soluble titanium compound with an alkali metal silicate solution, said titanium compound being non-reactive with said silicate; b. adding an acidic material to said silicate solution containing said titanium compound to form a hydrogel; c. aging said hydrogel for a time greater than 1 hour; d. washing said thus aged hydrogel with either an ammonium salt solution or a dilute acid to produce a substantially alkali metal-free hydrogel; e. forming a mixture comprising said thus washed hydrogel and a normally liquid oxygen-containing, water-soluble organic azeotrope-forming compound; f. separating said organic compound and water from said mixture to form a xerogel.
Claim 17
Dependent Claim
126 words
A process which comprises contacting an olefin with a catalyst comprising an activated chromium oxide supported on a silica-containing base prepared by: a. mixing a water soluble titanium compound with an alkali metal silicate solution, said titanium compound being non-reactive with said silicate; b. adding an acidic material to said silicate solution containing said titanium compound to form a hydrogel; c. aging said hydrogel for a time greater than 1 hour; d. washing said thus aged hydrogel with either an ammonium salt solution or a dilute acid to produce a substantially alkali metal-free hydrogel; e. forming a mixture comprising said thus washed hydrogel and a normally liquid oxygen-containing, water-soluble organic azeotrope-forming compound; f. separating said organic compound and water from said mixture to form a xerogel.
Claim 18
Dependent Claim
23 words
A process according to claim 15 wherein said olefin is at least one aliphatic mono-1-olefin having 2 to 8 carbon atoms per molecule.
Claim 19
Dependent Claim
25 words
A process according to claim 15 wherein said olefin is ethylene and another 1-olefin, and said polymer consists of 95 to 99 mole percent ethylene.
Claim 20
Dependent Claim
34 words
A method according to claim 15 wherein said contacting is carried out in a liquid diluent at a temperature such that at least a substantial part of polymer produced is insoluble in said diluent.
Claim 21
Dependent Claim
55 words
A method according to claim 15 wherein said contacting is carried out in a liquid diluent at a temperature within the range of 150 to 233° F, substantially all of said polymer is in particle-form, and said diluent is a paraffin or cycloparaffin or mixture thereof having from 3 to 12 carbon atoms per molecule.
Claim 22
Dependent Claim
11 words
A method according to claim 19 wherein said diluent is isobutane.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |