EP0080759A1
Expired / Lapsed
EP
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Process for the preparation of 3,5-dimethylphenol
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1982-11-18
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Granted: —
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Expires: 2002-11-18
Abstract
Abstract Isophorone is converted to 3,5-dimethylphenol in the gas phase in the presence of a catalyst comprising one or more catalytically active rare earth metals on alumina, preferably promoted by a transition metal, e.g. cobalt, and/or an alkali or alkaline earth metal, e.g. potassium.
Inventors
- 👤 Antonius J. C. Van Seters
- 👤 Freddy Wattimena
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 23:37
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/50
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
38 words
Process for the preparation of 3,5-dimethylphenol by converting isophorone in the gas phase in the presence of a catalyst, characterized in that the catalyst employed comprises one or more catalytically active rare earth metals on an alumina-based carrier.
Claim 2
Dependent Claim
38 words
Process for the preparation of 3,5-dimethylphenol by converting isophorone in the gas phase in the presence of a catalyst, characterized in that the catalyst employed comprises one or more catalytically active rare earth metals on an alumina-based carrier.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1, characterized in that said catalyst has a specific area not exceeding an area of the order of l.Om 2 /g.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 1, characterised in that said catalyst has a specific area not exceeding 0.5m 2 /g.
Claim 5
Dependent Claim
26 words
A process as claimed in any one of claims 1 to 3, characterized in that the catalyst contains a naturally occurring mixture of rare earth metals.
Claim 6
Dependent Claim
22 words
A process as claimed in any one of claims 1 to 4, characterized in that the alumina-based carrier consists of alpha alumina.
Claim 7
Dependent Claim
32 words
A process as claimed in any one of claims 1 to 5, characterized in that the catalyst contains 0.15 to 20% of rare earth metal based on the weight of the carrier.
Claim 8
Dependent Claim
36 words
A process as claimed in any one of claims 1 to 6, characterized in that the catalyst also contains up to 4% based on the weight of the carrier of an alkali and/or alkaline earth metal.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 7, characterized in that the amount of alkali and/or alkaline earth metal is from 0.01 to 1.0% by weight.
Claim 10
Dependent Claim
17 words
A process as claimed in claim 7 or 8, characterized in that the alkali metal is potassium.
Claim 11
Dependent Claim
44 words
A process as claimed in any one of claims 1 to 9, characterized in that the catalyst also contains up to 4% based on the weight of the carrier of a transition metal selected from Groups IB, VIB and VIII of the Periodic System.
Claim 12
Dependent Claim
22 words
A process as claimed in claim 10, characterized in that the amount of transition metal is from 0.01 to 1.0% by weight.
Claim 13
Dependent Claim
21 words
A process as claimed in claim 10 or 11 , characterized in that the transition metal is copper, silver and/or molybdenum.
Claim 14
Dependent Claim
17 words
A process as claimed in claim 10 or 11, characterized in that the transition metal is cobalt.
Claim 15
Dependent Claim
27 words
A process as claimed in any one of claims 1 to 12, characterized in that the process is carried out at a temperature of 525 to 625°C.
Claim 16
Dependent Claim
32 words
A process as claimed in any one of claims 1 to 14, characterized in that the process is carried out at a weight hourly space velocity of 0.5 to 1.0kg isophorone/1 catalyst/hour.
Claim 17
Dependent Claim
18 words
A process as claimed in claim 1 substantially as described hereinbefore and with particular reference to the Examples.
Claim 18
Dependent Claim
16 words
3,5-Dimethylphenol when prepared by a process as claimed in any one of claims 1 to 16.
Claim 19
Dependent Claim
81 words
Catalytic composition for the preparation of 3,5-dimethylphenol by conversion in the gas phase of isophorone, comprising an alumina-based carrier containing 0.5 to 10% of catalytically active rare earth metal(s), 0 to 4% of alkali (ne earth) metal (s) and 0 to 4% of transition metal (s) selected from Groups IB, VIB and VIII of the Periodic System, based on the weight of the carrier, the catalyst having a specific surface not exceeding an area of the order of l.Om 2 /g.
Claim 20
Dependent Claim
81 words
Catalytic composition for the preparation of 3,5-dimethylphenol by conversion in the gas phase of isophorone, comprising an alumina-based carrier containing 0.5 to 10% of catalytically active rare earth metal(s), 0 to 4% of alkali (ne earth) metal (s) and 0 to 4% of transition metal (s) selected from Groups IB, VIB and VIII of the Periodic System, based on the weight of the carrier, the catalyst having a specific surface not exceeding an area of the order of l.Om 2 /g.
References Cited (Backward Citations)
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