US2918505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of para-xylene
Assignee: Union Oil Company of California
•
Filing: 1953-11-02
•
Granted: 1959-12-22
•
Expires: 1973-11-02
Abstract
No abstract record available.
Inventors
- 👤 Carleton B Scott
- 👤 William D Schaeffer
- 👤 Thomas F Doumani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:53
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/08; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C5/00; C07C5/22; C07C5/2206; C07C5/2226; C07C5/2246; C07C5/27; C07C5/2729; C07C5/2732; C07C5/274; C07C5/2748; C07C7/00; C07C7/04; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/70; C07C2523/76; C07C2523/84; C07C2523/85; C07C2523/88; C07C2523/882; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206; C07C2527/1213
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE PROCESS WHICH COMPRISES (1) ADMIXING A FEED STREAM COMPRISING PARA-XYLENE, ETHYLBENZENE AND AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF META-XYLENE AND OROTO-XYLENE WITH A RECYCLE STREAM HEREINAFTER IDENTIFIED AND WITH AN ANTIMONY HALIDE SELECTED FROM THE CLASS CONSISTING OF ANTIMONY TRICHLORIDE AND ANTIMONY TRIBROMIDE AT A TEMPERATURE SUFFICIENT TO EFFECT THE FORMATION OF A SINGLE LIQUID PHASE; (2) LOWERING THE TEMPERATURE OF SAID LIQUID PHASE TO A VALUE SUCH THAT THERE IS FORMED A SOLID PHASE COMPRISING SAID ANTIMONY HALIDE AND HYDROCARBONS COMPONENTS OF SAID FEED AND RECYLCLE STREAM, THE RATIO OF PARA-XYLENE TO OTHER HYDROCARBON COMPONENTS OF SAID SOLID PHASE SUBSTANTIALLY HIGHER THAN THE RATIO THEREOF IN SAID FEED AND RECYCLE STREAMS, AND A LIQUID RAFFINATE PHASE COMPRISING SAID ANTIMONY HALIDE AND HYDROCARBON COMPONENTS OF SAID FEED AND RECYCLE STREAMS; (3) SEPARATING SAID SOLID PHASE FROM SAID LIQUID RAFFINATE PHASE; (4) RECOVERING THE HYDROCARBON
Claim 2
Dependent Claim
148 words
THE PROCESS WHICH COMPRISES (1) ADMIXING A FEED STREAM COMPRISING PARA-XYLENE, ETHYLBENZENE AND AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF META-XYLENE AND OROTO-XYLENE WITH A RECYCLE STREAM HEREINAFTER IDENTIFIED AND WITH AN ANTIMONY HALIDE SELECTED FROM THE CLASS CONSISTING OF ANTIMONY TRICHLORIDE AND ANTIMONY TRIBROMIDE AT A TEMPERATURE SUFFICIENT TO EFFECT THE FORMATION OF A SINGLE LIQUID PHASE; (2) LOWERING THE TEMPERATURE OF SAID LIQUID PHASE TO A VALUE SUCH THAT THERE IS FORMED A SOLID PHASE COMPRISING SAID ANTIMONY HALIDE AND HYDROCARBONS COMPONENTS OF SAID FEED AND RECYLCLE STREAM, THE RATIO OF PARA-XYLENE TO OTHER HYDROCARBON COMPONENTS OF SAID SOLID PHASE SUBSTANTIALLY HIGHER THAN THE RATIO THEREOF IN SAID FEED AND RECYCLE STREAMS, AND A LIQUID RAFFINATE PHASE COMPRISING SAID ANTIMONY HALIDE AND HYDROCARBON COMPONENTS OF SAID FEED AND RECYCLE STREAMS; (3) SEPARATING SAID SOLID PHASE FROM SAID LIQUID RAFFINATE PHASE; (4) RECOVERING THE HYDROCARBON
References Cited (Backward Citations)
US2734929A
Cited
US2258726A
Cited
US2386969A
Cited
US2431515A
Cited
US2532276A
Cited
US2564073A
Cited
GB695947A
Cited
US2564388A
Cited
US2652438A
Cited
US2768222A
Cited
US2662925A
Cited
US2656397A
Cited
US2768220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |