US2580019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for washing butyl reactors with isobutylene
Assignee: Standard Oil Development Co
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Filing: 1946-10-09
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Granted: 1951-12-25
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Expires: 1966-10-09
Abstract
No abstract record available.
Inventors
- 👤 Leslie R Gould
- 👤 Wanless Graham George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:27
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN A LOW TEMPERATURE POLYMERIZATION PROCESS IN WHICH ISOBUTYLENE AND A MULTI OLEFIN ARE MIXED, DILUTED, COOLED TO A TEMPERATURE BETWEEN -40* C. AND -164* C. AND POLYMERIZED BY A FRIDEL-CRAFTS CATALYST AT LOW TEMPERATURE TO YIELD A POLYMER SLURRY, A PORTION OF WHICH ADHERES TO THE INTERIOR OF THE REACTOR, THE STEPS IN COMBINATION OF DISPLACING THE COLD REACTION MIXTURE AT THE END OF THE POLYMERIZATION BY A STREAM CONSISTING OF LIQUID ISOBUTYLENE UNDER PRESSURE AT A TEMPERATURE BETWEEN -6* C. AND +30* C., CIRCULATING THE WARM ISOBUTYLENE RAPIDLY OVER THE ADHERENT POLYMER TO SOLVATE IT AND ERODE IT BY THE FLOWING STREAM, CARRYING OUT FROM THE REACTOR A STREAM OF WARM ISOBUTYLENE CONTAINING PROTIONS OF SUSPENDED SOLVATED POLYMER; AND THEREAFTER DISPLACING THE WARM ISOBUTYLENE FROM THE REACTOR BY SOLVENT NAPHTHA.
Claim 2
Dependent Claim
132 words
IN A LOW TEMPERATURE POLYMERIZATION PROCESS IN WHICH ISOBUTYLENE AND A MULTI OLEFIN ARE MIXED, DILUTED, COOLED TO A TEMPERATURE BETWEEN -40* C. AND -164* C. AND POLYMERIZED BY A FRIDEL-CRAFTS CATALYST AT LOW TEMPERATURE TO YIELD A POLYMER SLURRY, A PORTION OF WHICH ADHERES TO THE INTERIOR OF THE REACTOR, THE STEPS IN COMBINATION OF DISPLACING THE COLD REACTION MIXTURE AT THE END OF THE POLYMERIZATION BY A STREAM CONSISTING OF LIQUID ISOBUTYLENE UNDER PRESSURE AT A TEMPERATURE BETWEEN -6* C. AND +30* C., CIRCULATING THE WARM ISOBUTYLENE RAPIDLY OVER THE ADHERENT POLYMER TO SOLVATE IT AND ERODE IT BY THE FLOWING STREAM, CARRYING OUT FROM THE REACTOR A STREAM OF WARM ISOBUTYLENE CONTAINING PROTIONS OF SUSPENDED SOLVATED POLYMER; AND THEREAFTER DISPLACING THE WARM ISOBUTYLENE FROM THE REACTOR BY SOLVENT NAPHTHA.
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) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |