US4453025A
Expired / Lapsed
US
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Process for the preparation of 3,5-xylenol
Assignee: Shell USA Inc
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Filing: 1982-11-23
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Granted: 1984-06-05
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Expires: 2002-11-23
Abstract
Abstract Isophorone is converted to 3,5-xylenol in the vapor phase in the presence of a heterogeneous catalyst comprising a particular combination of multiple rare earth metals on an alumina support or one or more rare earth metals in combination with one or more transition metals and/or one or more alkali or alkaline earth metals. Particularly good results are obtained with a catalyst comprising a naturally-occurring mixture of rare earth metals known as didymium in combination with potassium and cobalt promoters.
Inventors
- 👤 Antonius J. C. Van Seters
- 👤 Freddy Wattimena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:19
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/50
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
55 words
A process for the preparation of 3,5-xylenol from isophorone which comprises contacting isophorone at a temperature in the range from about 525° to 625° C. with a heterogeneous catalyst comprising didymium supported on an alumina carrier, said catalyst containing between about 0.5 and 20 percent by weight of didymium, calculated on weight of the carrier.
Claim 2
Dependent Claim
55 words
A process for the preparation of 3,5-xylenol from isophorone which comprises contacting isophorone at a temperature in the range from about 525° to 625° C. with a heterogeneous catalyst comprising didymium supported on an alumina carrier, said catalyst containing between about 0.5 and 20 percent by weight of didymium, calculated on weight of the carrier.
Claim 3
Dependent Claim
34 words
The process of claim 1, wherein the catalyst contains between about one and 8 percent by weight of didymium, and the catalyst has a surface area less than about 0.5 square meter per gram.
Claim 4
Dependent Claim
11 words
The process of claim 2, wherein the carrier is an alpha-alumina.
Claim 5
Dependent Claim
19 words
The process of claim 3, wherein the catalyst contains between about 2 and 4 percent by weight of didymium.
Claim 6
Dependent Claim
78 words
A process for the preparation of 3,5-xylenol from isophorone which comprises contacting isophorone at a temperature in the range from about 525° C. to 625° C. with a heterogeneous catalyst comprising between about 0.5 to 20 percent by weight of didymium and between about 0.01 and 4.0 percent by weight of one or more alkali or alkaline earth metals supported on an alumina carrier, said catalyst having a surface area not exceeding about 1.0 square meter per gram.
Claim 7
Dependent Claim
78 words
A process for the preparation of 3,5-xylenol from isophorone which comprises contacting isophorone at a temperature in the range from about 525° C. to 625° C. with a heterogeneous catalyst comprising between about 0.5 to 20 percent by weight of didymium and between about 0.01 and 4.0 percent by weight of one or more alkali or alkaline earth metals supported on an alumina carrier, said catalyst having a surface area not exceeding about 1.0 square meter per gram.
Claim 8
Dependent Claim
34 words
The process of claim 5, wherein the catalyst contains between about one and 8 percent by weight of didymium, and the catalyst has a surface area less than about 0.5 square meter per gram.
Claim 9
Dependent Claim
27 words
The process of claim 6, wherein the catalyst contains between about 0.01 and 1.0 percent by weight of the one or more alkali or alkaline earth metals.
Claim 10
Dependent Claim
11 words
The process of claim 7, wherein the carrier is an alpha-alumina.
Claim 11
Dependent Claim
21 words
The process of claim 8, wherein the catalyst contains potassium in an amount between about 0.01 and 1.0 percent by weight.
Claim 12
Dependent Claim
19 words
The process of claim 7, wherein the catalyst contains between about one and 8 percent by weight of didymium.
Claim 13
Dependent Claim
19 words
The process of claim 9 wherein the catalyst contains between about one and 8 percent by weight of didymium.
Claim 14
Dependent Claim
82 words
A process for the preparation of 3,5-xylenol which comprises contacting isophorone at a temperature in the range from about 525° to 625° C. with a heterogeneous catalyst comprising between about 0.5 and 20 percent by weight of didymium and between about 0.01 and 4.0 percent by weight of one or more transition metals in Groups IB, VIB, and VIII of the Periodic Table supported on an alumina carrier, said catalyst having a surface area not exceeding about 1.0 square meter per gram.
Claim 15
Dependent Claim
82 words
A process for the preparation of 3,5-xylenol which comprises contacting isophorone at a temperature in the range from about 525° to 625° C. with a heterogeneous catalyst comprising between about 0.5 and 20 percent by weight of didymium and between about 0.01 and 4.0 percent by weight of one or more transition metals in Groups IB, VIB, and VIII of the Periodic Table supported on an alumina carrier, said catalyst having a surface area not exceeding about 1.0 square meter per gram.
Claim 16
Dependent Claim
34 words
The process of claim 12, wherein the catalyst contains between about one and 8 percent by weight of didymium, and the catalyst has a surface area less than about 0.5 square meter per gram.
Claim 17
Dependent Claim
25 words
The process of claim 13, wherein the catalyst contains between between about 0.01 and 1.0 percent by weight of the one or more transition metals.
Claim 18
Dependent Claim
11 words
The process of claim 14, wherein the carrier is an alpha-alumina.
Claim 19
Dependent Claim
21 words
The process of claim 15, wherein the catalyst contains cobalt in an amount between about 0.01 and 1.0 percent by weight.
Claim 20
Dependent Claim
19 words
The process of claim 14, wherein the catalyst contains between about one and 8 percent by weight of didymium.
Claim 21
Dependent Claim
19 words
The process of claim 16, wherein the catalyst contains between about one and 8 percent by weight of didymium.
Claim 22
Dependent Claim
32 words
The process of claim 12, wherein the catalyst additionally comprises between about 0.01 and 4.0 percent by weight of one or more alkali or alkaline earth metals supported on the alumina carrier.
Claim 23
Dependent Claim
34 words
The process of claim 19, wherein the catalyst contains between about one and 8 percent by weight of didymium, and the catalyst has a surface area less than about 0.5 square meter per gram.
Claim 24
Dependent Claim
43 words
The process of claim 20, wherein the catalyst contains between about 0.01 and 1.0 percent by weight of the one or more transition metals and between about 0.01 and 1.0 percent by weight of the one or more alkali or alkaline earth metals.
Claim 25
Dependent Claim
12 words
The process of claim 21, wherein the carrier is an alpha alumina.
Claim 26
Dependent Claim
34 words
The process of claim 22, wherein the catalyst contains cobalt in an amount between about 0.01 and 1.0 percent by weight and potassium in an amount between about 0.01 and 1.0 percent by weight.
Claim 27
Dependent Claim
19 words
The process of claim 21, wherein the catalyst contains between about one and 8 percent by weight of didymium.
Claim 28
Dependent Claim
19 words
The process of claim 23, wherein the catalyst contains between about one and 8 percent by weight of didymium.
Claim 29
Dependent Claim
38 words
The process of claim 25, wherein the catalyst contains about 4 percent by weight of didymium, between about 0.1 and 0.4 percent by weight of potassium, and about 0.1 percent by weight cobalt, supported on an alpha-alumina carrier.
References Cited (Backward Citations)
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GB1190804A
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US3514492A
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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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |