US3855330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of styrene
Assignee: Societe Nationale des Petroles dAquitaine SA
•
Filing: 1972-09-20
•
Granted: 1974-12-17
•
Expires: 1992-09-20
Abstract
Abstract Styrene is produced from ethylbenzene by contacting the ethylbenzene with a first dehydrogenation catalyst, contacting the resulting product with oxygen and an oxidation catalyst, and contacting the resulting product with a second dehydrogenation catalyst.
Inventors
- 👤 J Mendelsohn
- 👤 J Blanc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:36
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/40; C07C15/42; C07C15/44; C07C15/46; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/068; B01J8/00; B01J8/02; B01J8/04; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3335; C07C5/3337; C07C5/42; C07C5/48; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00088; B01J2208/00389; B01J2208/00415; B01J2208/00548
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
188 words
IN A PROCESS FOR THE PRODUCTION OF STYRENE BY CONTACTING GASEOUS ETHYLBENZENE WITH A DEHYDROGENATION CATALYST SELECTED FROM THE GROUP CONSISTING OF IRON OXIDE; COBALT OXIDE; MIXTURE OF IRON OXIDE OR COBALT OXIDE WITH AN ALKALINE COMPOUND OF POTASSIUM OR CHROMIUM OXIDE; MIXTURE OF IRON OXIDE WITH AN ALKALI METAL OXIDE; MIXTURE OF IRON OXIDE WITH AN ALKALI METAL OXIDE AND CHROMIUM OXIDE; MIXTURE OF IRON OXIDE, CHROMIUM OXIDE, POTASSIUM CARBONATE AND A PHOSPHATE OF AN ALKALI METAL OR ALKALINE EARTH METAL; MIXTURE OF IRON OXIDE, ZINC OXIDE OR MAGNESIUM OXIDE WITH CHROMIUM OR COPPER SALT AND POTASSIUM OXIDE OR POTASSIUM CARBONATE; MIXTURE OF IRON OXIDE, ZINC OXIDE OR MAGNESIUM OXIDE WITH A CHROMIUM OR COPPER SALT, AND POTASSIUM OXIDE OR POTASSIUM CARBONATE, AND A VANADIUM COMPOUND AND AN OXIDATION CATALYST SELECTED FROM THE GROU CONSISTING OF PALLADIUM AND PLATINUM, AND OXIDES OF PALLAPLATINUM, SALTS OF PALLADIUM AND PLATINUM. AND OXIDES OF PALLADIUM AND PLATINUM, AND INTRODUCING OXYGEN INTO THE REACTION MEDIUM, THE IMPROVEMENT WHICH COMPRISES DISPOSING THE OXIDATION CATALYST IN A ZONE BETWEEN ZONES CONTAINING THE DEHYDROGENATION CATALYST, AND INTRODUCING OXYGEN ONLY INTO THE OXIDATION CATALYST ZONE.
Claim 2
Dependent Claim
188 words
IN A PROCESS FOR THE PRODUCTION OF STYRENE BY CONTACTING GASEOUS ETHYLBENZENE WITH A DEHYDROGENATION CATALYST SELECTED FROM THE GROUP CONSISTING OF IRON OXIDE; COBALT OXIDE; MIXTURE OF IRON OXIDE OR COBALT OXIDE WITH AN ALKALINE COMPOUND OF POTASSIUM OR CHROMIUM OXIDE; MIXTURE OF IRON OXIDE WITH AN ALKALI METAL OXIDE; MIXTURE OF IRON OXIDE WITH AN ALKALI METAL OXIDE AND CHROMIUM OXIDE; MIXTURE OF IRON OXIDE, CHROMIUM OXIDE, POTASSIUM CARBONATE AND A PHOSPHATE OF AN ALKALI METAL OR ALKALINE EARTH METAL; MIXTURE OF IRON OXIDE, ZINC OXIDE OR MAGNESIUM OXIDE WITH CHROMIUM OR COPPER SALT AND POTASSIUM OXIDE OR POTASSIUM CARBONATE; MIXTURE OF IRON OXIDE, ZINC OXIDE OR MAGNESIUM OXIDE WITH A CHROMIUM OR COPPER SALT, AND POTASSIUM OXIDE OR POTASSIUM CARBONATE, AND A VANADIUM COMPOUND AND AN OXIDATION CATALYST SELECTED FROM THE GROU CONSISTING OF PALLADIUM AND PLATINUM, AND OXIDES OF PALLAPLATINUM, SALTS OF PALLADIUM AND PLATINUM. AND OXIDES OF PALLADIUM AND PLATINUM, AND INTRODUCING OXYGEN INTO THE REACTION MEDIUM, THE IMPROVEMENT WHICH COMPRISES DISPOSING THE OXIDATION CATALYST IN A ZONE BETWEEN ZONES CONTAINING THE DEHYDROGENATION CATALYST, AND INTRODUCING OXYGEN ONLY INTO THE OXIDATION CATALYST ZONE.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the major part of the oxygen is consumed within the oxidation catalyst zone.
Claim 4
Dependent Claim
34 words
The process of claim 2 wherein the oxygen content at the inlet of the dehydrogenation zone downstream of the oxidation catalyst zone does not exceed 0.01 mole per mole of ethylbenzene which is present.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein at least about 15% of the ethylbenzene has been transformed into styrene before the reaction medium is introduced into the oxidation catalyst zone.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein the reaction medium is introduced into the oxidation catalyst zone before the yield of styrene is 50%.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the thickness of the oxidation catalyst zone is about 0.4 to 0.8 of the thickness of the initial dehydrogenation zone.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein each successive dehydrogenation catalyst zone is about 1.3 to 1.6 times thicker than the preceding dehydrogenation catalyst zone.
Claim 9
Dependent Claim
113 words
The process of claim 1 wherein thE thickness of the oxidation catalyst zone is 0.5 to 0.7 times the thickness of the initial dehydrogenation catalyst zone, each successive dehydrogenation catalyst zone is 1.5 times thicker than the preceding dehydrogenation catalyst zone, the oxygen content at the inlet of the dehydrogenation catalyst zone downstream of the oxidation catalyst zone does not exceed 0.01 mole per mole of ethylbenzene which is present, at least about 20% of the ethylbenzene has been transformed into styrene when the reaction medium is introduced into the oxidation catalyst zone and the yield of styrene is less than 30% when the reaction medium is introduced into the oxidation catalyst zone.
Claim 10
Dependent Claim
30 words
The process of claim 1 wherein the dehydrogenation catalyst is a mixture of iron, chromium and potassium oxide and wherein the oxidation catalyst is a calcined zeolite containing reduced platinum.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |