US2849433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inactivation of friedel-crafts catalyst systems
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1953-12-31
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Granted: 1958-08-26
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Expires: 1973-12-31
Abstract
No abstract record available.
Inventors
- 👤 Helmuth G Schneider
- 👤 Hans G Goering
- 👤 Vincent F Mistretta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:17
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
PROCESS FOR PREPARING POLYISOBUTYLENE WHICH COMPRISES CONTACTING A MIXTUE OF ISOBUTYLENE AND HEXANE AT -80* TO +40*C. IN THE PRESENCE OF FINELY DIVIDED SOLID FRIEDEL CRAFTS CATALYST AND CONTACTING THE REACTOR EFFLUENT IMMEDIATELY WITH 0.23 TO 1.2 WT. PERCENT OF WATER CONTAINING UP TO 1% CAUSTIC TO DEACTIVATE THE CATALYST, PASSING THE DEACTIVATED EFFLUENT IN HEAT EXCHANGE WITH THE FRESH FEED AND WASHING THE HEAT EXCHANGED EFFLUENT WITH AT LEAST EQUAL VOLUMES OF AQUEOUS CAUSTIC PER VOLUME OF REACTION PRODUCT, SAID CAUSTIC CONTAINING BETWEEN 10 AND 100 MOL PERCENT EXCESS SODIUM HYDROZIDE OVER THAT THEORETICALLY NECESSARY TO REACT WITH THE CATALYST.
Claim 2
Dependent Claim
101 words
PROCESS FOR PREPARING POLYISOBUTYLENE WHICH COMPRISES CONTACTING A MIXTUE OF ISOBUTYLENE AND HEXANE AT -80* TO +40*C. IN THE PRESENCE OF FINELY DIVIDED SOLID FRIEDEL CRAFTS CATALYST AND CONTACTING THE REACTOR EFFLUENT IMMEDIATELY WITH 0.23 TO 1.2 WT. PERCENT OF WATER CONTAINING UP TO 1% CAUSTIC TO DEACTIVATE THE CATALYST, PASSING THE DEACTIVATED EFFLUENT IN HEAT EXCHANGE WITH THE FRESH FEED AND WASHING THE HEAT EXCHANGED EFFLUENT WITH AT LEAST EQUAL VOLUMES OF AQUEOUS CAUSTIC PER VOLUME OF REACTION PRODUCT, SAID CAUSTIC CONTAINING BETWEEN 10 AND 100 MOL PERCENT EXCESS SODIUM HYDROZIDE OVER THAT THEORETICALLY NECESSARY TO REACT WITH THE CATALYST.
References Cited (Backward Citations)
US2125872A
Cited
US2387543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |