US4029715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethyl benzene
Assignee: Atlantic Richfield Co
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Filing: 1976-08-24
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Granted: 1977-06-14
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Expires: 1996-08-24
Abstract
Abstract A C8 cyclic olefin stream resulting from the dimerization of butadiene is dehydrogenated for highly selective preparation of ethyl benzene and hydrogen by directing a reactant stream consisting of a major amount of an inert gas such as nitrogen and a minor amount of said C8 cyclic olefin through a reaction zone having a cobalt molybdate on alumina catalyst containing 0.9-3% potassium oxide. The ethyl benzene is of suitable purity for manufacture of styrene therefrom.
Inventors
- 👤 Robert W. Rieve
- 👤 Harold Shalit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:32
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/367; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
The method of preparing ethyl benzene which consists of: directing a stream of C 8 cyclic olefin hydrocarbon vapors rich in 4-vinyl cyclohexene-1, together with a larger volume of an inert gas selected from nitrogen, steam, carbon dioxide, argon, and mixtures thereof as a reactant stream toward a fixed bed of catalyst particles, said reactant stream being substantially free from hydrogen; directing said reactant stream through a fixed bed of particles consisting of alumina-supported oxides of cobalt, molydenum and potassium, the concentration of potassium oxide being within a range from about 0.9% to about 3%, said bed of particles being maintained at pressure within a range from about 0.4 to 8 atmospheres and at a temperature within a range from about b 400° C to about 450° C, the liquid space rate of C 8 hydrocarbons with respect to said bed of particles being within a range from about 0.5 to about 3.0 volumes of liquid per volume of catalyst bed per hour; and recovering ethyl benzene from the effluent from said catalyst bed.
Claim 2
Independent Claim
174 words
The method of preparing ethyl benzene which consists of: directing a stream of C 8 cyclic olefin hydrocarbon vapors rich in 4-vinyl cyclohexene-1, together with a larger volume of an inert gas selected from nitrogen, steam, carbon dioxide, argon, and mixtures thereof as a reactant stream toward a fixed bed of catalyst particles, said reactant stream being substantially free from hydrogen; directing said reactant stream through a fixed bed of particles consisting of alumina-supported oxides of cobalt, molydenum and potassium, the concentration of potassium oxide being within a range from about 0.9% to about 3%, said bed of particles being maintained at pressure within a range from about 0.4 to 8 atmospheres and at a temperature within a range from about b 400° C to about 450° C, the liquid space rate of C 8 hydrocarbons with respect to said bed of particles being within a range from about 0.5 to about 3.0 volumes of liquid per volume of catalyst bed per hour; and recovering ethyl benzene from the effluent from said catalyst bed.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |