Patent US3706155A successfully refreshed from Google Patents.
Patent US2514968A successfully refreshed from Google Patents.
US2514968A
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Purification of crude acrolein by rectified absorption
Assignee: Shell Development Co
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Filing: 1949-04-15
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Granted: 1950-07-11
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Expires: 1969-04-15
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:54
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/783; C07C45/80; C07C45/81; C07C45/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
THE PROCESS FOR SEPARATING ACROLEIN IN A HIGH STATE OF PURITY FROM A MIXTURE COMPRISING ACROLEIN IN ADMIXTURE WITH PROPIONALDEHYDE WHICH COMPRISES CONTACTING SAID MIXTURE WITH A STREAM OF WATER FLOWING COUTERCURRENT TO A STREAM OF INERT GAS AT A TEMPERATURE OF FROM ABOUT 0*C. TO ABOUT 15*C. IN A RECTIFIED ABSORPTION ZONE, THEREBY FORMING A GASEOUS PHASE CONSISTING ESSENTIALLY OF SAID STRIPPING GAS IN ADMIXTURE WITH ACROLEIN FREE OF ANY SUBSTANTIAL AMOUNT OF PROPIONALDEHYDE AND A LIQUID PHASE CONSISTING ESSENTIALLY OF WATER CONTAINING PROPIONALDEHYDE FREE OF ANY SUBSTANTIAL AMOUNT OF ACROLEIN IN SAID RECTIFIED ABSORPTION ZONE, AND SEPARATING ACROLEIN IN A HIGH STATE OF PURITY FROM SAID GASEOUS PHASE.
Claim 2
Dependent Claim
110 words
THE PROCESS FOR SEPARATING ACROLEIN IN A HIGH STATE OF PURITY FROM A MIXTURE COMPRISING ACROLEIN IN ADMIXTURE WITH PROPIONALDEHYDE WHICH COMPRISES CONTACTING SAID MIXTURE WITH A STREAM OF WATER FLOWING COUTERCURRENT TO A STREAM OF INERT GAS AT A TEMPERATURE OF FROM ABOUT 0*C. TO ABOUT 15*C. IN A RECTIFIED ABSORPTION ZONE, THEREBY FORMING A GASEOUS PHASE CONSISTING ESSENTIALLY OF SAID STRIPPING GAS IN ADMIXTURE WITH ACROLEIN FREE OF ANY SUBSTANTIAL AMOUNT OF PROPIONALDEHYDE AND A LIQUID PHASE CONSISTING ESSENTIALLY OF WATER CONTAINING PROPIONALDEHYDE FREE OF ANY SUBSTANTIAL AMOUNT OF ACROLEIN IN SAID RECTIFIED ABSORPTION ZONE, AND SEPARATING ACROLEIN IN A HIGH STATE OF PURITY FROM SAID GASEOUS PHASE.
References Cited (Backward Citations)
US2334091A
Cited
US2281092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-10 | 1954-01-09 | 1954-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-10 | 1958-01-09 | 1958-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-10 | 1962-01-09 | 1962-07-11 | $7700.00 | Window Closed / Lapsed |