US4444964A
Expired / Lapsed
US
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Polymerization process using phosphate supported chromium catalyst
Assignee: Phillips Petroleum Co
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Filing: 1982-09-27
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Granted: 1984-04-24
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Expires: 2002-09-27
Abstract
Abstract In accordance with one embodiment of this invention, a chromium catalyst supported on an aluminum phosphate-containing base is used in conjunction with a boron component either as a part of the base or as a cocatalyst. The resulting catalyst is unique both in its favorable sensitivity to molecular weight control agents such as hydrogen and in its ability to produce a fundamentally different olefin polymer. In accordance with another embodiment of this invention, the chromium is supported on a phosphate base produced using a melt of the aluminum salt.
Inventors
- 👤 Max P. McDaniel
- 👤 Marvin M. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:24
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
68 words
A polymerization process comprising: contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule with a catalyst system comprising: (a) a catalyst comprising a chromium compound on a predominantly amorphous aluminum phosphate containing xerogel base which catalyst has been activated in an oxidizing ambient; (b) a cocatlyst comprising a boron compound selected from trihydrocarbyl boron compounds, boron alkoxides, and mixtures thereof; and recovering a polymer.
Claim 2
Dependent Claim
68 words
A polymerization process comprising: contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule with a catalyst system comprising: (a) a catalyst comprising a chromium compound on a predominantly amorphous aluminum phosphate containing xerogel base which catalyst has been activated in an oxidizing ambient; (b) a cocatlyst comprising a boron compound selected from trihydrocarbyl boron compounds, boron alkoxides, and mixtures thereof; and recovering a polymer.
Claim 3
Dependent Claim
31 words
A process according to claim 1 wherein said at least one mono-1-olefin is selected from ethylene, propylene, 1-butene, 1-pentene, 1-hexene and 1-octene and said polymerization is carried out under slurry conditions.
Claim 4
Dependent Claim
25 words
A process according to claim 2 wherein said at least one mono-1-olefin comprises ethylene and said polymerization conditions include a temperature of 205° F.±5° F.
Claim 5
Dependent Claim
28 words
A process according to claim 2 wherein said cocatalyst is added to a reaction zone containing said at least one mono-1-olefin as a separate stream from the catalyst.
Claim 6
Dependent Claim
35 words
A process according to claim 1 wherein an essentially ethylene homopolymer having a melt index of greater than 0.1 is produced by incorporating 0.001 to 0.3 mole percent comonomer in an essentially pure ethylene feed.
Claim 7
Dependent Claim
25 words
A process according to claim 5 wherein 0.01 to 0.1 mole percent of one of propylene, 1-butene, 1-pentene, 1-hexene or 1-octene is in the feed.
Claim 8
Dependent Claim
26 words
A process according to claim 1 wherein an atom ratio of phosphorus to aluminum in said catalyst system is within the range of 0.2:1 to 1:1.
Claim 9
Dependent Claim
26 words
A process according to claim 1 wherein an atom ratio of phosphorus to aluminum in said catalyst system is within the range of 0.6:1 to 0.9:1.
Claim 10
Dependent Claim
13 words
A process according to claim 1 wherein said boron compound is a trialkylborane.
Claim 11
Dependent Claim
17 words
A process according to claim 1 wherein said boron compound is one of triethylborane, tripropylborane and tributylborane.
Claim 12
Dependent Claim
12 words
A process according to claim 1 wherein said boron compound is tri-n-butylborane.
Claim 13
Dependent Claim
31 words
A process according to claim 1 wherein said catalyst is present in an amount sufficient to give an atom ratio of boron to chromium within the range of 2:1 to 10:1.
Claim 14
Dependent Claim
50 words
A process according to claim 1 wherein the chromium of said chromium compound is present in an amount within the range of 0.1 to 5 weight percent based on the weight of the xerogel base and wherein said catalyst has been activated in air at a temperature of 300°-600° C.
Claim 15
Dependent Claim
34 words
A process according to claim 1 wherein said predominantly amorphous aluminum phosphate base is formed in the presence of 1 to 30 mole percent of a boron compound based on the moles of phosphate.
Claim 16
Dependent Claim
33 words
A process according to claim 1 wherein said aluminum phosphate is prepared by combining a source of phosphate ions with a hydrated molten aluminum salt and then neutralizing by mixing with a base.
Claim 17
Dependent Claim
18 words
A process according to claim 1 wherein said cocatalyst contains in addition an aluminum, zinc or magnesium alkyl.
Claim 18
Dependent Claim
18 words
A process according to claim 1 wherein said cocatalyst is a mixture of a trialkylborane and a trialkylaluminum.
Claim 19
Dependent Claim
21 words
A process according to claim 17 wherein said trialkylborane is one of triethylborane, tripropylborane and tributylborane and said trialkylaluminum is triethylaluminum.
Claim 20
Dependent Claim
21 words
A process according to claim 1 wherein the chromium in said catalyst system is at least predominantly in the hexavalent state.
Claim 21
Dependent Claim
68 words
A polymerization process comprising: contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule in a reaction zone under polymerization conditions with a catalyst comprising; an oxidized chromium compund on a predominantly amorphous aluminum phosphate base prepared by combining a melt of an aluminum salt and a source of phosphate ions and neutralizing with a base so as to case gellation; and recovering a polymer.
Claim 22
Dependent Claim
68 words
A polymerization process comprising: contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule in a reaction zone under polymerization conditions with a catalyst comprising; an oxidized chromium compund on a predominantly amorphous aluminum phosphate base prepared by combining a melt of an aluminum salt and a source of phosphate ions and neutralizing with a base so as to case gellation; and recovering a polymer.
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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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |