US4048243A
Expired / Lapsed
US
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Method for the production of ethylbenzene
Assignee: Huels AG
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Filing: 1976-01-06
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Granted: 1977-09-13
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Expires: 1996-01-06
Abstract
Abstract Method for the production of ethylbenzene by the dehydrogenation of cycloolefins containing 8 carbon atoms and two double bonds in the presence of aromatization catalysts. The cycloolefin ring contains 6 carbon atoms and at least one double bond. These cycloolefins are treated at temperatures of about 20° - 150° C and under pressures of about 0.8 - 2 atmospheres with an aromatization catalyst containing 5 - 25 percent by weight of an alkali metal and 75 - 95 percent by weight of aluminum oxide as the support.
Inventors
- 👤 Gerhard Ruckelshauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:17
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/02; B01J23/04; C; C07; C07C; C07C5/00; C07C5/32; C07C5/373; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/954
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
In the method for the production of ethylbenzene by catalytic dehydrogenation of cycloolefins having 8 carbon atoms and 2 double bonds in the presence of aromatization catalysts, the improvement comprising: said cycloolefins having a 6 carbon atom ring with at least one double bond, said dehydrogenation is carried out at a temperature of about 20° to 150° C and under a pressure of about 0.8 to 2 atmospheres, and said aromatization catalysts consisting essentially of about 5 to 25 percent by weight of an alkali metal and about 75 to 95 percent by weight aluminum oxide support.
Claim 2
Dependent Claim
97 words
In the method for the production of ethylbenzene by catalytic dehydrogenation of cycloolefins having 8 carbon atoms and 2 double bonds in the presence of aromatization catalysts, the improvement comprising: said cycloolefins having a 6 carbon atom ring with at least one double bond, said dehydrogenation is carried out at a temperature of about 20° to 150° C and under a pressure of about 0.8 to 2 atmospheres, and said aromatization catalysts consisting essentially of about 5 to 25 percent by weight of an alkali metal and about 75 to 95 percent by weight aluminum oxide support.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said temperature is about 40° to 130° C.
Claim 4
Dependent Claim
10 words
The method of claim 2, wherein said pressure is atmospheric.
Claim 5
Dependent Claim
18 words
The method of claim 3, wherein said catalysts contain about 8 to 15 percent of said alkali metal.
Claim 6
Dependent Claim
16 words
The method of claim 3, wherein said catalysts contain about 10 percent of said alkali metal.
Claim 7
Dependent Claim
23 words
The method of claim 3, having a weight ratio of alkali metal to cycloolefins of about 1 : 1000 to 1 : 30.
Claim 8
Dependent Claim
18 words
The method of claim 6, wherein said weight ratio is about 1 : 150 to 1 : 50.
Claim 9
Dependent Claim
11 words
The method of claim 7, wherein said alkali metal is sodium.
Claim 10
Dependent Claim
12 words
The method of claim 8, wherein said aluminum oxide is γ-aluminum oxide.
Claim 11
Dependent Claim
34 words
The method of claim 1, wherein said cycloolefins are selected from the group consisting of cis -(1) - ethylidene -cyclohexene (2), trans -(1) -ethylidenecyclohexene -(2), 1-ethyl -cyclohexadiene -(1,3), 2-ethyl -cyclo-hexadiene-(1,3), 1-ethyl-cyclohexadiene -(1,4) and 1-vinylcyclohexene-3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |