US2695324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon purification process
Assignee: California Research LLC
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Filing: 1952-05-16
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Granted: 1954-11-23
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Expires: 1972-05-16
Abstract
No abstract record available.
Inventors
- 👤 Gordon E Langlois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:02
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/085; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/70; C07C7/00; C07C7/10; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A PROCESS FOR PRODUCING AN ISOPROPYL AROMATIC HYDROCARBON BY ALKYLATING A BENZENE HYDROCARBON HAVING A MOLECULAR WEIGHT NOT EXCEEDING THAT OF XYLENE WITH PROPYLENE IN THE PRESENCE OF A PHOSPHORIC ACID CATALYST AS THE SOLE ACTIVE CATALYTIC AGENT, THE METHOD OF INCREASING THE YIELD OF ISOPROPYL BENZENE HYDROCARBON SUBSTANTIALLY FREE OF ITS BUTYL BENZENE HOMOLOGUE OBTAINABLE BY FRACTIONAL DISTILLATION OF THE ALKYLATION PRODUCT WHICH COMPRISES INTIMATELY CONTACTING THE ALKYLATION REACTION PRODUCT WITH 90 TO 100% SULFURIC ACID, SEPARATING AN ACID PHASE AND A HYDROCARBON PHASE AND FRACTIONALLY DISTILLING THE HYDROCARBON PHASE TO SEPARATE AN OVERHEAD FRACTION CONSISTING ESSENTIALLY OF THE ISOPROPYL BENZENE ESSENTIALLY FREE OF ITS BUTYL BENZENE HOMOLOGUE.
Claim 2
Dependent Claim
110 words
IN A PROCESS FOR PRODUCING AN ISOPROPYL AROMATIC HYDROCARBON BY ALKYLATING A BENZENE HYDROCARBON HAVING A MOLECULAR WEIGHT NOT EXCEEDING THAT OF XYLENE WITH PROPYLENE IN THE PRESENCE OF A PHOSPHORIC ACID CATALYST AS THE SOLE ACTIVE CATALYTIC AGENT, THE METHOD OF INCREASING THE YIELD OF ISOPROPYL BENZENE HYDROCARBON SUBSTANTIALLY FREE OF ITS BUTYL BENZENE HOMOLOGUE OBTAINABLE BY FRACTIONAL DISTILLATION OF THE ALKYLATION PRODUCT WHICH COMPRISES INTIMATELY CONTACTING THE ALKYLATION REACTION PRODUCT WITH 90 TO 100% SULFURIC ACID, SEPARATING AN ACID PHASE AND A HYDROCARBON PHASE AND FRACTIONALLY DISTILLING THE HYDROCARBON PHASE TO SEPARATE AN OVERHEAD FRACTION CONSISTING ESSENTIALLY OF THE ISOPROPYL BENZENE ESSENTIALLY FREE OF ITS BUTYL BENZENE HOMOLOGUE.
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) | 1957-11-22 | 1958-05-24 | 1958-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-22 | 1962-05-24 | 1962-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-22 | 1966-05-24 | 1966-11-23 | $7700.00 | Window Closed / Lapsed |