US2771497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying isobutylene
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1952-11-19
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Granted: 1956-11-20
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Expires: 1972-11-19
Abstract
No abstract record available.
Inventors
- 👤 John C Hunt
- 👤 Stanley E Jaros
- 👤 Joseph F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:20
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/14833; C07C7/1485; C07C7/04; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A PROCESS FOR THE PREPARATION OF PURE ISOBUTYLENE SUITABLE FOR THE PREPARATION OF SOLID POLYMERS WHEREIN AN ISOBUTYLENE STREAM CONTAINING METHYL MERCAPTAN IS ABSORBED IN ABOUT 65% SULFURIC ACID AT A TEMPERATURE OF 70-100* C. TO PRODUCE AN ACID EXTRACT BY HEATING BUTYLENE IS REGENERATED FROM THE ACID EXTRACT BY HEATING IT TO A TEMPERATURE OF ABOUT 250* C. IN THE PRESENCE OF WATER, WHEREBY ISOBUTYLENE CONTAINING SMALL AMOUNTS OF METHYL MERCAPTAN IS OBTAINED, THE IMPROVEMENT WHICH COMPRISES DISTILLING THE ISOBUTYLENE STREAM IN A FIRST DISTILLIATION ZONE TO REMOVE OVERHEAD THE METHYL MERCAPTAN AS AN ISOBUTYLENEL-METHYL MERCAPTAN DISTILLATE BY VIRTUE OF ITS PROPERTY OF FORMING A MINIMUM BOILING AZEOTROPE WITH ISOBUTYLENE AND A METHYL MERCAPTAN FREE BOTTOMS, RECYCLING THE DISTILLATE TO THE ACID ABSORPTION STEP.
Claim 2
Dependent Claim
126 words
IN A PROCESS FOR THE PREPARATION OF PURE ISOBUTYLENE SUITABLE FOR THE PREPARATION OF SOLID POLYMERS WHEREIN AN ISOBUTYLENE STREAM CONTAINING METHYL MERCAPTAN IS ABSORBED IN ABOUT 65% SULFURIC ACID AT A TEMPERATURE OF 70-100* C. TO PRODUCE AN ACID EXTRACT BY HEATING BUTYLENE IS REGENERATED FROM THE ACID EXTRACT BY HEATING IT TO A TEMPERATURE OF ABOUT 250* C. IN THE PRESENCE OF WATER, WHEREBY ISOBUTYLENE CONTAINING SMALL AMOUNTS OF METHYL MERCAPTAN IS OBTAINED, THE IMPROVEMENT WHICH COMPRISES DISTILLING THE ISOBUTYLENE STREAM IN A FIRST DISTILLIATION ZONE TO REMOVE OVERHEAD THE METHYL MERCAPTAN AS AN ISOBUTYLENEL-METHYL MERCAPTAN DISTILLATE BY VIRTUE OF ITS PROPERTY OF FORMING A MINIMUM BOILING AZEOTROPE WITH ISOBUTYLENE AND A METHYL MERCAPTAN FREE BOTTOMS, RECYCLING THE DISTILLATE TO THE ACID ABSORPTION STEP.
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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |