US4152503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst support prepared by alcohol treatment of hydrogels
Assignee: Phillips Petroleum Co
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Filing: 1977-12-23
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Granted: 1979-05-01
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Expires: 1997-12-23
Abstract
Abstract A method is provided for treating a hydrogel with a saturated, aliphatic alcohol selected from the group consisting of 1-pentanol, 2-pentanol, 3-methyl-1-butanol, 4-methyl-2-pentanol, 2,2-dimethyl-1-propanol and 1-hexanol to remove water thereby producing a dried product that retains a porous structure and is particularly suitable upon impregnation with a polymerization catalyst for use in promoting the production of ethylene polymers of melt index in excess of about 6.6.
Inventors
- 👤 James N. Short
- 👤 Donald R. Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:59
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; Y; Y10; Y10S; Y10S526/00; Y10S526/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 words
A method for producing a polymer of ethylene having a melt index in excess of about 6.6 in a particle form polymerization process comprising reacting ethylene monomer at conditions to produce a polymer in the presence of a catalyst produced by: (1) forming a silica-containing hydrogel; (2) impregnating said hydrogel with an amount of a chromium-containing compound suitable for catalyzing an ethylene polymerization reaction; (3) treating said hydrogel to remove water with an aliphatic alcohol chosen from the group consisting of 1-pentanol, 3-methyl-1-butanol, 4-methyl-2-pentanol, 2,2-dimethyl-1-propanol and 1-hexanol, said treating comprising azeotropic distillation or continuous extraction; (4) removing said alcohol from the water-free gel thereby recovering a solid, particulate material; and (5) calcining said particulate material in a substantially dry, molecular oxygen-containing gas at a temperature and for a time sufficient to activate the catalyst.
Claim 2
Independent Claim
134 words
A method for producing a polymer of ethylene having a melt index in excess of about 6.6 in a particle form polymerization process comprising reacting ethylene monomer at conditions to produce a polymer in the presence of a catalyst produced by: (1) forming a silica-containing hydrogel; (2) impregnating said hydrogel with an amount of a chromium-containing compound suitable for catalyzing an ethylene polymerization reaction; (3) treating said hydrogel to remove water with an aliphatic alcohol chosen from the group consisting of 1-pentanol, 3-methyl-1-butanol, 4-methyl-2-pentanol, 2,2-dimethyl-1-propanol and 1-hexanol, said treating comprising azeotropic distillation or continuous extraction; (4) removing said alcohol from the water-free gel thereby recovering a solid, particulate material; and (5) calcining said particulate material in a substantially dry, molecular oxygen-containing gas at a temperature and for a time sufficient to activate the catalyst.
Claim 3
Independent Claim
138 words
A method for producing a polymer of ethylene having a melt index in excess of about 6.6 in a particle form polymerization process comprising reacting ethylene monomer at conditions to produce a polymer in the presence of a catalyst produced by: (1) forming a silica-containing hydrogel; (2) treating said hydrogel to remove water with an aliphatic alcohol chosen from the group consisting of 1-pentanol, 3-methyl-1-butanol, 4-methyl-2-pentanol, 2,2-dimethyl-1-propanol and 1-hexanol, said treating comprising azeotropic distillation or continuous extraction; (3) removing said alcohol from the water-free gel thereby recovering a solid, particulate material; (4) impregnating the xerogel produced by step (2) with an amount of a chromium compound suitable for catalyzing an ethylene polymerization reaction; and (5) calcining said particulate material in a substantially dry, molecular oxygen-containing gas at a temperature and for a time sufficient to activate the catalyst.
Claim 4
Independent Claim
138 words
A method for producing a polymer of ethylene having a melt index in excess of about 6.6 in a particle form polymerization process comprising reacting ethylene monomer at conditions to produce a polymer in the presence of a catalyst produced by: (1) forming a silica-containing hydrogel; (2) treating said hydrogel to remove water with an aliphatic alcohol chosen from the group consisting of 1-pentanol, 3-methyl-1-butanol, 4-methyl-2-pentanol, 2,2-dimethyl-1-propanol and 1-hexanol, said treating comprising azeotropic distillation or continuous extraction; (3) removing said alcohol from the water-free gel thereby recovering a solid, particulate material; (4) impregnating the xerogel produced by step (2) with an amount of a chromium compound suitable for catalyzing an ethylene polymerization reaction; and (5) calcining said particulate material in a substantially dry, molecular oxygen-containing gas at a temperature and for a time sufficient to activate the catalyst.
Claim 5
Dependent Claim
34 words
A method of claim 1 wherein said polymerization is carried out at a temperature within the range of about 100° to about 250° F. and pressure ranging from about 100 to about 700 psia.
Claim 6
Dependent Claim
34 words
A method of claim 2 wherein said polymerization is carried out at a temperature within the range of about 100° to about 250° F. and pressure ranging from about 100 to about 700 psia.
Claim 7
Dependent Claim
34 words
A method of claim 1 wherein the reaction is carried out in a liquid hydrocarbon diluent in which substantially all the polymer formed is insoluble thereby producing a polymer in a solid particle form.
Claim 8
Dependent Claim
34 words
A method of claim 2 wherein the reaction is carried out in a liquid hydrocarbon diluent in which substantially all the polymer formed is insoluble thereby producing a polymer in a solid particle form.
Claim 9
Dependent Claim
23 words
A method of claim 5 wherein the diluent is a paraffin or cycloparaffin having about 3 to about 12 carbon atoms per molecule.
Claim 10
Dependent Claim
23 words
A method of claim 6 wherein the diluent is a paraffin or cycloparaffin having about 3 to about 12 carbon atoms per molecule.
Claim 11
Dependent Claim
16 words
A method of claim 1 wherein hydrogen is present during the reacting of the ethylene monomer.
Claim 12
Dependent Claim
16 words
A method of claim 2 wherein hydrogen is present during the reacting of the ethylene monomer.
Claim 13
Dependent Claim
26 words
A method of claim 5 wherein the catalyst concentration is about 0.001 to about 10 weight percent based on the total weight of the reactor contents.
Claim 14
Dependent Claim
26 words
A method of claim 6 wherein the catalyst concentration is about 0.001 to about 10 weight percent based on the total weight of the reactor contents.
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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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |