US4038211A
Expired / Lapsed
US
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Olefin hydration catalyst
Assignee: Millennium Petrochemicals Inc
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Filing: 1975-07-09
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Granted: 1977-07-26
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Expires: 1995-07-09
Abstract
Abstract An improved olefin hydration catalyst is disclosed and comprises phosphoric acid supported on a particular type of porous silica xerogel which has been treated with steam under particular temperature conditions.
Inventors
- 👤 Orville D. Frampton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J21/00; B01J21/06; B01J21/08; B01J23/00; B01J23/70; B01J23/76; B01J23/78; B01J27/00; B01J27/14; B01J27/16; B01J37/00; B01J37/08; B01J37/10; C; C07; C07C; C07C29/00; C07C29/03; C07C29/04; C07C41/00; C07C41/01; C07C41/05; C07C41/09; B01J35/61; B01J35/615; B01J35/63; B01J35/635; B01J35/638; B01J35/64; B01J35/647
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A process for preparing the olefin hydration catalyst which comprises employing an intermediate density silica xerogel characterized by having a particle size passing through 3 mesh and retained on 20 mesh, a bulk density of 0.38-0.48 g/cc, a pore volume of 0.80-2.2 ml/g with most of said volume contributed by micropores, and a BET surface area of 200-500 m 2 /g; contacting said xerogel with water vapor or a mixture of water vapor and an inert gas diluent at a total pressure of 20-1500 psig, a relative humidity of about 30%-100%, and a temperature above 100° C. and less than 200° C.; and impregnating said xerogel with H 3 PO 4 .
Claim 2
Dependent Claim
112 words
A process for preparing the olefin hydration catalyst which comprises employing an intermediate density silica xerogel characterized by having a particle size passing through 3 mesh and retained on 20 mesh, a bulk density of 0.38-0.48 g/cc, a pore volume of 0.80-2.2 ml/g with most of said volume contributed by micropores, and a BET surface area of 200-500 m 2 /g; contacting said xerogel with water vapor or a mixture of water vapor and an inert gas diluent at a total pressure of 20-1500 psig, a relative humidity of about 30%-100%, and a temperature above 100° C. and less than 200° C.; and impregnating said xerogel with H 3 PO 4 .
Claim 3
Dependent Claim
59 words
The process of claim 1 wherein said xerogel is retained on 12 mesh, has a bulk density of 0.40-0.45 g/cc, a pore volume of 0.85-1.3 ml/g, and has the following composition in terms of weight percent dry basis: SiO 2 over 99%, Fe 2 O 3 0.01-0.03%, Na 2 O 0.02-0.09%, and Al 2 O 3 less than 0.4%.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said contacting is effected for 4-16 hours before said xerogel is impregnated with H 3 PO 4 .
Claim 5
Dependent Claim
32 words
The process of claim 3 wherein said temperature is 145°-175° C., said relative humidity is about 30%-50%, said total pressure is about 150-650 psig, and said contact time is about 4-10 hours.
Claim 6
Dependent Claim
59 words
The process of claim 4 wherein said xerogel is retained on 12 mesh, has a bulk density of 0.40-0.45 g/cc, a pore volume of 0.85-1.3 ml/g, and has the following composition in terms of weight percent dry basis: SiO 2 over 99%, Fe 2 O 3 0.01-0.03%, Na 2 O 0.02-0.09%, and Al 2 O 3 less than 0.4%.
Claim 7
Dependent Claim
29 words
The process of claim 5 wherein said H 3 PO 4 is employed in the form of a 40%-70% aqueous solution and said impregnation is effected at 20°-50° C.
Claim 8
Dependent Claim
10 words
The process of claim 6 wherein said concentration is 55%-60%.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein said xerogel is impregnated with H 3 PO 4 before it is contacted with said water vapor.
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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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |