US3218357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering unsaturated aldehydes
Assignee: RUHRCHEMIC AG
•
Filing: 1961-06-29
•
Granted: 1965-11-16
•
Expires: 1981-06-29
Abstract
No abstract record available.
Inventors
- 👤 Roelen Otto
- 👤 Rottig Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:30
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82; C07C45/783
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR THE RECOVERY OF AN UNSATURATED ALDEHYDE SELECTED FROMTHE GROUP CONSISTING OF ACROLEIN AND METHACROLEIN FROM A GASEOUS REACTION MIXTURE PRODUCED IN THE CATALYTIC OXIDATION OF PROPYLENE AND BUTYLENE RESPECTIVELY, WHICH COMPRISES COOLING THE GASEOUS REACTION MIXTURE WHEREBY SUSSTANTIALLY ALL OF THE WATER CONTAINED IN SUCH GASEOUS REACTION MIXTURE IS CONDENSED, AND SEPARATED OUT, THEREAFTER SCRUBBING THE GASEOUS REACTION MIXTURE USING AS SCRUBBING AGENT A BRANCHED-CHAIN ALIPHATIC HYDROCARBON HAVING FROM 6 TO 20 CAROBNA TOMS INITS MOLECULE AT A TEMPERATURE OF FROM 0 TO -70 DEGREES C. AND RECOVERING THE UNSATURATED ALDEHYDE FROM THE SCRUBBING LIQUID BY DISTILLATION THEREOF.
Claim 2
Dependent Claim
101 words
A PROCESS FOR THE RECOVERY OF AN UNSATURATED ALDEHYDE SELECTED FROMTHE GROUP CONSISTING OF ACROLEIN AND METHACROLEIN FROM A GASEOUS REACTION MIXTURE PRODUCED IN THE CATALYTIC OXIDATION OF PROPYLENE AND BUTYLENE RESPECTIVELY, WHICH COMPRISES COOLING THE GASEOUS REACTION MIXTURE WHEREBY SUSSTANTIALLY ALL OF THE WATER CONTAINED IN SUCH GASEOUS REACTION MIXTURE IS CONDENSED, AND SEPARATED OUT, THEREAFTER SCRUBBING THE GASEOUS REACTION MIXTURE USING AS SCRUBBING AGENT A BRANCHED-CHAIN ALIPHATIC HYDROCARBON HAVING FROM 6 TO 20 CAROBNA TOMS INITS MOLECULE AT A TEMPERATURE OF FROM 0 TO -70 DEGREES C. AND RECOVERING THE UNSATURATED ALDEHYDE FROM THE SCRUBBING LIQUID BY DISTILLATION THEREOF.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |