US4368301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solubilized chromium salt in polymerization catalyst
Assignee: Phillips Petroleum Co
•
Filing: 1981-08-28
•
Granted: 1983-01-11
•
Expires: 2001-08-28
Abstract
Abstract A chromium salt such as ammonium chromate or ammonium dichromate, which is normally insoluble in nonaqueous solvents which do not easily rehydrate the silica surface is solubilized, for instance by treating it with a crown ether, and impregnated onto a particulate support from a nonaqueous solvent which does not easily rehydrate the silica. The resulting composition is then activated in an oxygen ambient such as air in a conventional manner and then utilized as a catalyst for polymerization reactions such as the production of polyolefins.
Inventors
- 👤 Gil R. Hawley
- 👤 Max P. McDaniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:04
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/22; B01J31/2204; B01J31/2208; B01J31/2213; B01J23/00; B01J23/16; B01J23/24; B01J23/26; B01J31/1616; C; C08; C08F; C08F10/00; B01J2531/00; B01J2531/60; B01J2531/62
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A process comprising: contacting a chromium-containing salt, which is insoluble in nonaqueous solvents which do not easily rehydrate silica, with a solubilizing agent thus converting it to a chromium-containing complex having charged ions which is soluble in said nonaqueous solvents; impregnating a particulate support with the thus solubilized chromium-containing complex dissolved in a nonaqueous solvent which does not easily rehydrate silica; activating said thus impregnated support by heating same in an oxygen ambient at a temperature sufficient to oxidize at least a portion of said chromium to produce a catalyst; contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule with said catalyst under polymerization conditions; and recovering a polymer.
Claim 2
Dependent Claim
113 words
A process comprising: contacting a chromium-containing salt, which is insoluble in nonaqueous solvents which do not easily rehydrate silica, with a solubilizing agent thus converting it to a chromium-containing complex having charged ions which is soluble in said nonaqueous solvents; impregnating a particulate support with the thus solubilized chromium-containing complex dissolved in a nonaqueous solvent which does not easily rehydrate silica; activating said thus impregnated support by heating same in an oxygen ambient at a temperature sufficient to oxidize at least a portion of said chromium to produce a catalyst; contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule with said catalyst under polymerization conditions; and recovering a polymer.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein said olefin is selected from ethylene, propylene, 1-butene and 1-hexene.
Claim 4
Dependent Claim
12 words
A process according to claim 1 wherein said olefin is predominantly ethylene.
Claim 5
Dependent Claim
26 words
A process according to claim 3 wherein said contacting under polymerization conditions is carried out at a temperature within the range of 150° to 230° F.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein said chromium-containing salt is selected from chromates, dichromates and mixtures thereof.
Claim 7
Dependent Claim
14 words
A method according to claim 1 wherein said solubilizing agent is a crown ether.
Claim 8
Dependent Claim
14 words
A method according to claim 1 wherein said particulate support is a silica-titania cogel.
Claim 9
Dependent Claim
25 words
A method according to claim 1 wherein said activating is carried out in air at a temperature within the range of 1500° to 1700° F.
Claim 10
Dependent Claim
31 words
A method according to claim 1 wherein said chromium-containing salt is selected from ammonium chromate and ammonium dichromate and wherein said solubilizing agent is a substituted or unsubstituted 18-crown-6 -macrocyclic polyether.
Claim 11
Dependent Claim
12 words
A method according to claim 9 wherein said macrocyclic polyether is dicyclohexano-18-crown-6.
Claim 12
Dependent Claim
25 words
A method according to claim 10 wherein said activating is carried out in air at a temperature within the range of 1500° to 1700° F.
Claim 13
Dependent Claim
30 words
A method according to claim 11 wherein said nonaqueous solvent is acetone and wherein said chromium salt is contacted with said solubilizing agent by mixing the two together in acetone.
Claim 14
Dependent Claim
22 words
A method according to claim 1 wherein said nonaqueous solvent is selected from hydrocarbons, halohydrocarbons, acetonitrile, ketones, tertiary alcohols and secondary alcohols.
References Cited (Backward Citations)
US3072627A
Cited
US2984653A
Cited
US3349067A
Cited
US3900457A
Cited
US3887494A
Cited
US3709853A
Cited
US3879362A
Cited
US3976632A
Cited
US4016343A
Cited
US4015059A
Cited
US4053437A
Cited
US4212765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |