Patent US4081407A successfully refreshed from Google Patents.
US4081407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst support prepared by alcohol treatment of hydrogels
Assignee: Phillips Petroleum Co
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Filing: 1976-03-18
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Granted: 1978-03-28
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Expires: 1996-03-18
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
2026-11-01 10:57
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; Y; Y10; Y10S; Y10S526/00; Y10S526/905
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A method for producing a supported catalyst said catalyst suitable producing ethylene polymer having a melt index in excess of about 6.6 in a particle form polymerization process, said method comprising: for producing 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
Claim 2
Independent Claim
102 words
A method for producing a supported catalyst said catalyst suitable producing ethylene polymer having a melt index in excess of about 6.6 in a particle form polymerization process, said method comprising: for producing 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
Claim 3
Dependent Claim
23 words
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
Dependent Claim
23 words
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
Independent Claim
126 words
A method for producing a supported catalyst said catalyst suitable for producing ethylene polymer having a melt index in excess of about 6.6 in a particle form polymerization process, said method comprising: 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; 3. 4. impregnating said xerogel with an amount of a chromium compound suitable for catalyzing an ethylene polymerization reaction; and 5. calcining said particulate material is a substantially dry, molecular oxygen-containing gas at a temperature and for a time sufficient to activate the catalyst.
Claim 6
Independent Claim
126 words
A method for producing a supported catalyst said catalyst suitable for producing ethylene polymer having a melt index in excess of about 6.6 in a particle form polymerization process, said method comprising: 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; 3. 4. impregnating said xerogel with an amount of a chromium compound suitable for catalyzing an ethylene polymerization reaction; and 5. calcining said particulate material is a substantially dry, molecular oxygen-containing gas at a temperature and for a time sufficient to activate the catalyst.
Claim 7
Dependent Claim
33 words
An ethylene polymerization catalyst said catalyst suitable for producing ethylene polymer having a melt index in excess of about 6.6 in a particle form polymerization process produced by the method of claim 1.
Claim 8
Dependent Claim
33 words
An ethylene polymerization catalyst said catalyst suitable for producing ethylene polymer having a melt index in excess of about 6.6 in a particle form polymerization process produced by the method of claim 2.
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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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |