US2740819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 1-isopropyl-2, 4-dimethylbenzene
Assignee: American Oil Co
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Filing: 1954-06-22
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Granted: 1956-04-03
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Expires: 1974-06-22
Abstract
No abstract record available.
Inventors
- 👤 Kirkland Earl Vance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:43
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/68; C07C2527/00; C07C2527/06; C07C2527/125; C07C2527/126
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
THE PROCESS FOR PREPARING 1-ISOPROPYL-2-4-DIMETHYLBENZENE, WHICH PROCESS COMPRISES DISPERSING SUBSTANTIALLY ANHYDROUS ALUMINUM CHLORIDE IN SUBSTANTIALLY PURE LIQUID META-XYLENE IN A REACTION ZONE, INTRODUCING PROPYLENE INTO SAID ZONE IN A MOL RATIO OF PROPYLENE TO XYLENE OF BETWEEN ABOUT 0.5 AND 2, MAINTAINGING SAID ZONE AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 150* C. AT A PRESSURE AT LEAST SUFFICIENT TO HOLD SAID XYLENE IN THE LIQUID STATE, FOR A TIME SUFFICIENT TO SUBSTANTIALLY COMPLETE THE ALKYLATION REACTION, WHEREIN LIQUID WATER IS PRESENT WITH SAID XYLENE IN AN AMOUNT ABOUT 75% OF THAT NEEDED TO HYDRATE SAID ALUMINUM CHLORIDE, AND SAID CHLORIDE IS PRESENT IN AN AMOUNT BETWEEN ABOUT 0.5 AND 10 WEIGHT PERCENT, BASED ON REACTANTS, AND SEPARATING FROM THE REACTION PRODUCT MIXTURE AN ISOPROPYLXYLENE FRACTION CONTAINING 1-ISOPROPYL-2,4-DIMETHYLBENZENE AS THE PREDOMINANT ISOMER.
Claim 2
Dependent Claim
134 words
THE PROCESS FOR PREPARING 1-ISOPROPYL-2-4-DIMETHYLBENZENE, WHICH PROCESS COMPRISES DISPERSING SUBSTANTIALLY ANHYDROUS ALUMINUM CHLORIDE IN SUBSTANTIALLY PURE LIQUID META-XYLENE IN A REACTION ZONE, INTRODUCING PROPYLENE INTO SAID ZONE IN A MOL RATIO OF PROPYLENE TO XYLENE OF BETWEEN ABOUT 0.5 AND 2, MAINTAINGING SAID ZONE AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 150* C. AT A PRESSURE AT LEAST SUFFICIENT TO HOLD SAID XYLENE IN THE LIQUID STATE, FOR A TIME SUFFICIENT TO SUBSTANTIALLY COMPLETE THE ALKYLATION REACTION, WHEREIN LIQUID WATER IS PRESENT WITH SAID XYLENE IN AN AMOUNT ABOUT 75% OF THAT NEEDED TO HYDRATE SAID ALUMINUM CHLORIDE, AND SAID CHLORIDE IS PRESENT IN AN AMOUNT BETWEEN ABOUT 0.5 AND 10 WEIGHT PERCENT, BASED ON REACTANTS, AND SEPARATING FROM THE REACTION PRODUCT MIXTURE AN ISOPROPYLXYLENE FRACTION CONTAINING 1-ISOPROPYL-2,4-DIMETHYLBENZENE AS THE PREDOMINANT ISOMER.
References Cited (Backward Citations)
US2450764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |