US4296001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium impregnated silica-chromium catalysts
Assignee: Phillips Petroleum Co
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Filing: 1980-02-06
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Granted: 1981-10-20
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Expires: 2000-02-06
Abstract
Abstract In accordance with a first embodiment of this invention, a silica xerogel is aqueously impregnated with a titanium compound which is resistant to hydrolysis. In accordance with a second embodiment of this invention, a silica hydrogel containing a titanium compound resistant to hydrolysis is dried. In this embodiment, the hydrogel preferably also contains a pore preserving agent. This invention makes possible the use of aqueous impregnation of titanium and conventional drying techniques to give a catalyst having characteristics associated with azeotrope dried silica-titanium coprecipitated catalyst. The catalysts of this invention are useful in olefin polymerization processes, particularly in the polymerization of predominantly ethylene monomer systems under slurry conditions.
Inventors
- 👤 Gil R. Hawley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:15
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
29 words
A process for producing a chromium-containing catalyst comprising impregnating a dry silica xerogel, formed by drying a silica hydrogel, with an aqueous solution of a hydrolysis resistant titanium compound.
Claim 2
Dependent Claim
29 words
A process for producing a chromium-containing catalyst comprising impregnating a dry silica xerogel, formed by drying a silica hydrogel, with an aqueous solution of a hydrolysis resistant titanium compound.
Claim 3
Dependent Claim
52 words
A method according to claim 1 wherein said silica is made by adding an alkali metal silicate to an acid to form a hydrogel, washing the hydrogel with water, impregnating the thus washed hydrogel with an aqueous solution of a chromium compound selected from CrO 3 and chromium acetate and spray drying.
Claim 4
Dependent Claim
74 words
A method according to claim 2 wherein said hydrolysis resistant titanium compound is a titanium chelate having the formula ##STR5## where R is an alkyl group containing from 1 to about 4 carbon atoms, A is a functional group containing O or N or is OH, and B is a divalent hydrocarbon chain of 2 or 3 carbon atoms which can have one or more alkyl groups of 1 to about 4 carbon atoms.
Claim 5
Dependent Claim
17 words
A method according to claim 3 where said hydrolysis resistant titanium compound is lactic acid titanium chelate.
Claim 6
Dependent Claim
16 words
A method according to claim 3 wherein said hydrolysis resistant compound is tetraoctylene glycol titanium chelate.
Claim 7
Dependent Claim
15 words
A method according to claim 3 wherein said hydrolysis resistant titanium compound is triethanolamine titanate.
Claim 8
Dependent Claim
20 words
A method according to claim 3 wherein said dried hydrogel containing said titanium compound is activated by reduction and reoxidation.
Claim 9
Dependent Claim
58 words
A method according to claim 6 wherein the titanium-impregnated chromium-containing catalyst is dried and thereafter activated in air at a temperature within the range of 400° to 1100° C., and wherein said catalyst contains from about 0.5 to about 4 weight percent chromium and 2 to 6 weight percent titanium based on the weight of the activated catalyst.
Claim 10
Dependent Claim
9 words
A catalyst produced by the method of claim 8.
Claim 11
Dependent Claim
9 words
A catalyst produced by the method of claim 1.
Claim 12
Dependent Claim
26 words
A process for preparing a chromium-containing catalyst comprising forming a silica hydrogel containing a hydrolysis resistant titanium compound, and drying said hydrogel to form a xerogel.
Claim 13
Dependent Claim
26 words
A process for preparing a chromium-containing catalyst comprising forming a silica hydrogel containing a hydrolysis resistant titanium compound, and drying said hydrogel to form a xerogel.
Claim 14
Dependent Claim
18 words
A method according to claim 11 wherein said chromium is added as an aqueous solution to said hydrogel.
Claim 15
Dependent Claim
23 words
A method according to claim 12 wherein said chromium is in the form of a compound selected from CrO 3 and chromium acetate.
Claim 16
Dependent Claim
20 words
A method according to claim 13 wherein said hydrogel is formed by adding an alkali metal silicate to an acid.
Claim 17
Dependent Claim
34 words
A method according to claim 14 wherein said hydrogel is spray dried and said hydrolysis resistant titanium compound is incorporated into said hydrogel by adding it to the hydrogel after the hydrogel is formed.
Claim 18
Dependent Claim
74 words
A method according to claim 15 wherein said hydrolysis resistant titanium compound is a titanium chelate having the formula ##STR6## where R is an alkyl group containing from 1 to about 4 carbon atoms, A is a functional group containing O or N or is OH, and B is a divalent hydrocarbon chain of 2 or 3 carbon atoms which can have one or more alkyl groups of 1 to about 4 carbon atoms.
Claim 19
Dependent Claim
15 words
A method according to claim 16 wherein said hydrolysis resistant titanium compound is triethanolamine titanate.
Claim 20
Dependent Claim
18 words
A method according to claim 16 wherein said hydrolysis resistant titanium chelate compound is lactic acid titanium chelate.
Claim 21
Dependent Claim
17 words
A method according to claim 16 wherein said hydrolysis resistant titanium compound is tetraoctylene glycol titanium chelate.
Claim 22
Dependent Claim
15 words
A method according to claim 16 wherein said xerogel is activated by reduction and reoxidation.
Claim 23
Dependent Claim
68 words
A method according to claim 17 wherein said thus spray dried catalyst is activated in air at a temperature within the range of 400° to 1100° C. and wherein the thus-activated catalyst contains chromium in an amount within the range of 0.5 to 4 weight percent and titanium and an amount within the range of 2 to 6 weight percent based on the weight of the activated catalyst.
Claim 24
Dependent Claim
9 words
A catalyst produced by the method of claim 21.
Claim 25
Dependent Claim
9 words
A catalyst produced by the method of claim 11.
Claim 26
Dependent Claim
27 words
A process according to claim 11 wherein said hydrogel contains in addition a pore preserving agent selected from organic silicon compounds, oxygen-containing organic compounds, acids, and surfactants.
Claim 27
Dependent Claim
28 words
A method according to claim 24 wherein said hydrogel is washed with water and subsequent to said washing said pore preserving agent is added to the thus-washed hydrogel.
Claim 28
Dependent Claim
18 words
A method according to claim 25 wherein said chromium is added as an aqueous solution to said hydrogel.
Claim 29
Dependent Claim
23 words
A method according to claim 26 wherein said chromium is in the form of a compound selected from CrO 3 and chromium acetate.
Claim 30
Dependent Claim
20 words
A method according to claim 27 wherein said hydrogel is formed by adding an alkali metal silicate to an acid.
Claim 31
Dependent Claim
14 words
A method according to claim 28 wherein said hydrogel is dried by spray drying.
Claim 32
Dependent Claim
76 words
A method according to claim 29 wherein said hydrolysis resistant titanium compound is selected from a titanium chelate having the formula ##STR7## wherein R is an alkyl group containing from 1 to about 4 carbon atoms, A is a functional group containing O or N or is OH, and B is a divalent hydrocarbon chain of 2 or 3 carbon atoms which can have one or more alkyl groups of 1 to about 4 carbon atoms.
Claim 33
Dependent Claim
15 words
A method according to claim 30 wherein said hydrolysis resistant titanium compound is triethanolamine titanate.
Claim 34
Dependent Claim
15 words
A method according to claim 30 wherein said hydrolysis resistant titanium compound is triethanolamine titanate.
Claim 35
Dependent Claim
17 words
A method according to claim 30 wherein said hydrolysis resistant titanium compound is lactic acid titanium chelate.
Claim 36
Dependent Claim
17 words
A method according to claim 30 wherein said hydrolysis resistant titanium compound is tetraoctylene glycol titanium chelate.
Claim 37
Dependent Claim
15 words
A method according to claim 30 wherein said xerogel is activated by reduction and reoxidation.
Claim 38
Dependent Claim
24 words
A method according to claim 32 wherein said pore preserving agent is selected from a polysiloxane-polyoxyalkylene copolymer, a polyethoxylated sorbitol monolaurate, a polyethoxylated t-octylphenol.
Claim 39
Dependent Claim
9 words
A catalyst produced by the method of claim 36.
Claim 40
Dependent Claim
9 words
A catalyst produced by the method of claim 24.
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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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |