US2744150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of m- and p-diisopropylbenzene
Assignee: Hercules Powder Co
•
Filing: 1953-06-29
•
Granted: 1956-05-01
•
Expires: 1973-06-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Herman I Enos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:15
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/70; C07C6/00; C07C6/08; C07C6/12; C07C6/126; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/054; C07C2527/06; C07C2527/125; C07C2527/126
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
THE METHOD OF PREPARING A DIISOPROPYLBENZENE SUBSTANTIALLY FREE OF O-DIISOPROPYLBENZENE IN AN ALKYLADANE WHICH COMPRISES PROPYLATING BENZENE IN AN ALKYLATION REACTION WITH A PROPYLENE-CONTAINING GAS, CONTAINING NO HIGHER MOLECULAR WEIGHT UNSATURATES, AT AS LOW A TEMPERATURE IN THE RANGE OF 30*-150* C. AND IN THE PRESENCE OF AS SMALL AN AMOUNT OF AN ALKYLATION CATALYST AS WILL BRING ABOUT ALKYLATION TO A MIXTURE RICH IN POLYISOPROPYLBENZENE, SEPARATING THE POLYISOPROPYLBENZENES FREE OF TRIMETHYLINDANE FROM THE BY-PRODUCTS OF THE ALKYLATION REACTION, CONTACTING A DISPROPORTIONATION REACTION MIXTURE CONSISTING ESSENTIALLY OF THE POLYISOPROPYLBENZENES IN ADMIXTURE WITH BENZENE WHEREIN THE RATIO OF ISOPROPYL GROUPS TO BENZENE GROUPS IS APPROXIMATELY 2:1 WITH 0.1 TO 2 MOLE PER CENT OF THE DISPROPORTIONATION REACTION MIXTURE OF ALUMINUM CHLORIDE AT A TEMPERATURE IN THE RANGE OF 65*-115* C. TO EFFECT A DISPORPORTIONATION REACTION, UNTIL THE DISPROPORTIONATION REACTION MIXTURE IS ENRICHED IN M-DIISOPROPYLBENZENE AND IS SUBSTANTIALLY FREE OF O-DIISOPROPYLBENZENE AND TRIMETHYLINDANE, AND SEPARATING AT LEAST ONE OF THE GROUP OF M-DIISOPROPYLBENZENE AND P-DIISOPROPYLBENZENE FROM THE DISPROPORTIONATION REACTION MIXTURE BY DISTILLATION.
Claim 2
Independent Claim
170 words
THE METHOD OF PREPARING A DIISOPROPYLBENZENE SUBSTANTIALLY FREE OF O-DIISOPROPYLBENZENE IN AN ALKYLADANE WHICH COMPRISES PROPYLATING BENZENE IN AN ALKYLATION REACTION WITH A PROPYLENE-CONTAINING GAS, CONTAINING NO HIGHER MOLECULAR WEIGHT UNSATURATES, AT AS LOW A TEMPERATURE IN THE RANGE OF 30*-150* C. AND IN THE PRESENCE OF AS SMALL AN AMOUNT OF AN ALKYLATION CATALYST AS WILL BRING ABOUT ALKYLATION TO A MIXTURE RICH IN POLYISOPROPYLBENZENE, SEPARATING THE POLYISOPROPYLBENZENES FREE OF TRIMETHYLINDANE FROM THE BY-PRODUCTS OF THE ALKYLATION REACTION, CONTACTING A DISPROPORTIONATION REACTION MIXTURE CONSISTING ESSENTIALLY OF THE POLYISOPROPYLBENZENES IN ADMIXTURE WITH BENZENE WHEREIN THE RATIO OF ISOPROPYL GROUPS TO BENZENE GROUPS IS APPROXIMATELY 2:1 WITH 0.1 TO 2 MOLE PER CENT OF THE DISPROPORTIONATION REACTION MIXTURE OF ALUMINUM CHLORIDE AT A TEMPERATURE IN THE RANGE OF 65*-115* C. TO EFFECT A DISPORPORTIONATION REACTION, UNTIL THE DISPROPORTIONATION REACTION MIXTURE IS ENRICHED IN M-DIISOPROPYLBENZENE AND IS SUBSTANTIALLY FREE OF O-DIISOPROPYLBENZENE AND TRIMETHYLINDANE, AND SEPARATING AT LEAST ONE OF THE GROUP OF M-DIISOPROPYLBENZENE AND P-DIISOPROPYLBENZENE FROM THE DISPROPORTIONATION REACTION MIXTURE BY DISTILLATION.
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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |