US3903185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of ethylbenzene
Assignee: BASF SE
•
Filing: 1973-11-15
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Granted: 1975-09-02
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Expires: 1993-11-15
Abstract
Abstract A method of manufacturing ethylbenzene in high yield by catalytic aromatization of the C8-cycloolefins obtained in the dimerization of unsaturated C4-hydrocarbons is described. Byproducts attributable to cracking, isomerization and decomposition of the raw material into its starting materials are virtually not detectable in the reaction product. The aromatization product can therefore be converted to styrene without prior distillation or purification.
Inventors
- 👤 Hans-Henning Vogel
- 👤 Hans-Martin Weitz
- 👤 Ernst Lorenz
- 👤 Rolf Platz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:03
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/367
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A PROCESS FOR THE CONTINUOUS MANUFACTURE OF ETHYLBENZENE BY CATHYTIC DEHYDROGENATION OF CYCLOOLEFINS OF 8 C ATOMS IN THE PRESENCE OF AROMATIZATION CATAYLSTS AND OF HYDROGEN, AT SUPERATMOSPHETIC PRESSURE AND ELEVATED TEMPERATURE, WHEREIN C8-CYCLOOLEFINS ARE CONVERTED AT TEMPERATURES RANGING FROM 350* TO 450*C AND PRESSURES RANGING FROM 2.5 TO 30 ATMOSPHERES GAUGE, IN THE PRESENCE OF 0.2 TO 20 M3 (S.T.P.) OF HYDROGEN/KG OF C8-CYCLOOLEFIN, BY THE USE OF CATALYSTS WHICH CONTAIN METAL AND/OR OXIDES OF SUBGROUPS V1, V11 AND V111 OF THE PERIODIC TABLE, INCLUDING THE PLATIUM METALS, THE METALS AND/OR METAL OXIDES BEING PRESENT SINGLY OR AS MIXTURES.
Claim 2
Dependent Claim
100 words
A PROCESS FOR THE CONTINUOUS MANUFACTURE OF ETHYLBENZENE BY CATHYTIC DEHYDROGENATION OF CYCLOOLEFINS OF 8 C ATOMS IN THE PRESENCE OF AROMATIZATION CATAYLSTS AND OF HYDROGEN, AT SUPERATMOSPHETIC PRESSURE AND ELEVATED TEMPERATURE, WHEREIN C8-CYCLOOLEFINS ARE CONVERTED AT TEMPERATURES RANGING FROM 350* TO 450*C AND PRESSURES RANGING FROM 2.5 TO 30 ATMOSPHERES GAUGE, IN THE PRESENCE OF 0.2 TO 20 M3 (S.T.P.) OF HYDROGEN/KG OF C8-CYCLOOLEFIN, BY THE USE OF CATALYSTS WHICH CONTAIN METAL AND/OR OXIDES OF SUBGROUPS V1, V11 AND V111 OF THE PERIODIC TABLE, INCLUDING THE PLATIUM METALS, THE METALS AND/OR METAL OXIDES BEING PRESENT SINGLY OR AS MIXTURES.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1, wherein pressures ranging from 5 to 12 atmospheres gauge are used.
Claim 4
Dependent Claim
26 words
A process as claimed in claim 1, wherein the conversion is carried out in the presence of 1.5 to 15 m3 (S.T.P.) of hydrogen/kg of C8-cycloolefin.
Claim 5
Dependent Claim
27 words
A process as claimed in claim 1, wherein the catalyst used contains 0.1 to 1.5 percent by weight of platinum on gamma -aluminum oxide as the support.
Claim 6
Dependent Claim
59 words
A process as claimed in claim 1, wherein 4-vinylcyclohexene-1 is converted at temperatures ranging from 380* to 420*C and pressures ranging from 5 to 12 atmospheres gauge, in the presence of 1.5 to 15 m3 (S.T.P.) of hydrogen/kg of vinylcyclohexene, using a catalyst which contains 0.1 to 2 percent by weight of platinum on a gamma -aluminum oxide support.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1 wherein the ethylcyclohexane content of the resultant dehydrogenation product is less than 2.5% by weight.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 1 wherein said cycloolefin of 8 C atoms is 4-vinylcyclohexene-1 or 4-ethylcyclohexene-1.
Claim 9
Dependent Claim
22 words
A process as claimed in claim 7 wherein the ethylcyclohexane content of the resultant dehydrogenation product is less than 2.5% by weight.
Claim 10
Dependent Claim
39 words
A process as claimed in claim 1 wherein the specific velocity in the dehydrogenation zone is in the range of 0.5 to 10 liters, expressed as parts by volume of liquid starting material, per liter of catalyst per hour.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 1 wherein said catalyst is cobalt oxide and molybdenum oxide on gamma -aluminum oxide as the support.
References Cited (Backward Citations)
US3511885A
Cited
US3758600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |