Method for the recovery of isobutylene
Abstract
Abstract A METHOD FOR TOTAL RECOVERY OF ISOBUTYLENE, PARTICULARLY USEFUL IN THE "WEAK" (50%) H2SO4 EXTRACTION PROCESS, FROM A MIXED C4 STREAM OF CRACKED PETROLEUM GASES WHERE THE EFFLUX FROM THE ACID REGENERATOR COMPRISES ISOBUTYLENE, TERTIARY BUTYL ALCOHOL, LOWER ISOBUTYLENE POLYMERS, WATER AND H2SO4 COMPRISING TREATING THE EFFLUX IN A CAUSTIC SODA SCRUBBING TOWER TO REMOVE H2SO4, LIQUEFYING THE VAPORS (PREFERABLY BY FIRST PARTIALLY CONDENSING THE VAPORS WITH FLASH DISTILLATION TO GIVE RESIDUAL VAPORS CONTAINING ABOUT 99% OF THE TOTAL ISOBUTYLENE AND THEN COMPRESSING AND CONDENSING THE RESIDUAL VAPORS), SETTLING THE RESULTING LIQUID, SEPARATING THE RESULTING AQUEOUS PHASE AND THE ORGANIC PHASE (WHICH LATTER CONTAINS ALL THE ISOBUTYLENE) AND CONCENTRATING THE ISOBUTYLENE BY KNOWN MEANS.
Inventors
- 👤 W Steggerda
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |