Process for the production and recovery of ortho-xylene para-xylene and ethylbenzene
Abstract
Abstract A DUAL ABSORPTION AND ISOMERIZATION PROCESS EMPLOYING A COMBINATION OF A FIRST ABSORPTION ZONE IN COMMUNICATION WITH A SECOND ABSORPTION AND AN ISOMERIZATION ZONE. THE PROCESS IS SUITABLE FOR THE SEPARATION OF VARIOUS C8 ISOMERS INTO INDIVIDUAL RELATIVELY PURE STREAMS CONTAINING THE INDIVIDUAL ISOMERS. A FIRST ADSORPTION ZONE SEPARATES PARA-XYLENE AND ETHYLBENZENE FROM THE OTHER C8 AROMATIC ISOMERS FED TO THAT ADSORPTION ZONE AND PASSES THE PARA-XYLENE AND ETHYLBENZENE TO A SECOND ADSORPTION ZONE WHEREIN PARA-XYLENE AND ETHYLBENZENE AR SEPARATED INTO RELATIVELY PURIFIED PARA-XYLENE AND ETHYLBENZENE STREAMS. THE REMAINING C8 AROUMATICS SEPARATED FROM THE PARA-XYLENE AND ETHYLBENZENE IN THE FIRST ADSORPTION ZONE ARE PASSED INTO AN ISOMERIZATION ZONE TO EFFECT THE PRODUCTION OF ADDITIONAL PARA-XYLENE WHICH IS EVENTUALLY RECYCLED TO THE FIRST ABSORPTION ZONE ALLOWING INCREASED YIELD OF PARA-XLENE BASED ON THE C8 AROMATIC FED TO THE FIRST ADSORPTION ZONE. AN ORTHO-XYLENE STREAM IS RECOVERED FROM THE EFFLUENT STREAM FROM THE ISIMERIZATION REACTION ZONE.
Inventors
- 👤 Laurence O Stine
- 👤 Donald B Broughton
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |