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US3969428A
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Process for the production of conjugated diolefins
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1974-10-11
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Granted: 1976-07-13
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Expires: 1994-10-11
Abstract
Abstract A process for the production of conjugated diolefins having 4-6 carbon atoms from the corresponding monoolefins according to the oxidative dehydrogenation process wherein oxides of molybdenum, arsenic and an alkaline earth metal are used as catalyst. The use of this catalyst enables the production of conjugated diolefins in a high yield.
Inventors
- 👤 Toshio Ishikawa
- 👤 Takashi Hayakawa
- 👤 Tsutomu Nishimura
- 👤 Michio Araki
- 👤 Katsuomi Takehira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:28
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/28; C; C07; C07C; C07C5/00; C07C5/42; C07C5/48
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A process for the production of conjugated diolefins having 4-6 carbon atoms from the corresponding monoolefins which comprises oxidatively dehydrogenating monoolefins having 4-6 carbon atoms in the vapor phase in the presence of molecular oxygen at a temperature of 300°-600°C, characterized in that said monoolefins are brought into contact with a catalyst consisting essentially of oxides of molybdenum, arsenic and an alkaline earth metal selected from the group consisting of magnesium, calcium, strontium and barium and represented by the empirical formula: Mo.sub.a Me.sub.b As.sub.c O.sub.d wherein Me stands for said alkaline earth metal, a is 1, b is 0.1-1, c is 0.1-1 and d stands for the number of oxygen atoms which satisfy the valence of the metals in the oxidized state.
Claim 2
Dependent Claim
122 words
A process for the production of conjugated diolefins having 4-6 carbon atoms from the corresponding monoolefins which comprises oxidatively dehydrogenating monoolefins having 4-6 carbon atoms in the vapor phase in the presence of molecular oxygen at a temperature of 300°-600°C, characterized in that said monoolefins are brought into contact with a catalyst consisting essentially of oxides of molybdenum, arsenic and an alkaline earth metal selected from the group consisting of magnesium, calcium, strontium and barium and represented by the empirical formula: Mo.sub.a Me.sub.b As.sub.c O.sub.d wherein Me stands for said alkaline earth metal, a is 1, b is 0.1-1, c is 0.1-1 and d stands for the number of oxygen atoms which satisfy the valence of the metals in the oxidized state.
Claim 3
Dependent Claim
39 words
A process according to claim 1 wherein said catalyst has been prepared by baking a mixture of molybdic acid, pyroarsenic acid and an oxide or hydroxide of an alkaline earth metal at a temperature of 200°-600°C in the air.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein said catalyst is carried on a porous support.
Claim 5
Dependent Claim
19 words
A process according to claim 1 wherein said monoolefins are in the form of a mixture with paraffinic hydrocarbons.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein said monoolefins are a C 4 fraction obtained by refining petroleum.
References Cited (Backward Citations)
US3159688A
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US3666822A
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US3480564A
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US3642930A
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US3821324A
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US3862256A
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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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |