US4479012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of aldehydes from hydroformylation reaction gas
Assignee: BASF SE
•
Filing: 1982-03-30
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Granted: 1984-10-23
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Expires: 2002-03-30
Abstract
Abstract Aldehydes are obtained from the gaseous product of the hydroformylation of olefinically unsaturated compounds using a rhodium catalyst by a process (cf. FIG. 2) in which (a) this gaseous product is introduced, without being cooled or depressured, into a distillation column D, (b) the top fraction from this column is cooled in a condenser K so that the greater part of the aldehydes contained therein is condensed, (c) the condensate is separated, in a separator A, into a gas phase and a liquid phase, (d) the gas phase from A, after waste gas has been separated off, is again brought to the hydroformylation pressure by means of a compressor P, and is returned to the reactor as a recycle gas, (e) the liquid phase from A is returned to D, and (f) the aldehydes are taken off from column D as liquid bottom products and/or as a vaporous side stream.
Inventors
- 👤 Karl Fischer
- 👤 Armin V. Grenacher
- 👤 Manfred Herr
- 👤 Max Strohmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:07
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/49; C07C45/50; C07C45/82; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582; Y10; Y10S; Y10S203/00; Y10S203/06; Y10S203/09
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
In a process for recovering an aldehyde from the gaseous product obtained by the hydroformylation of an olefinically unsaturated compound in a reactor R at elevated temperature and pressure while using a rhodium catalyst, the improvement which comprises: (a) introducing said gaseous product, without being cooled or depressured, from the hydroformylation reactor R into a distillation column D for distillation in countercurrent with a liquid phase; (b) cooling the top fraction from said column D in a condenser K so that the greater part of the aldehyde contained therein is condensed; (c) separating the condensate in a separator A into a gas phase and a liquid phase; (d) separating off a portion of the gas phase from A as a waste gas, and then bringing the remaining portion of the gas phase from A to the hydroformylation pressure by means of a compressor P and returning it to the reactor R as a recycle gas; (e) returning the liquid phase from separator A to an upper part of the distillation column D to flow countercurrently with respect to the gaseous product; and (f) taking off the aldehyde from a lower part of column D.
Claim 2
Dependent Claim
194 words
In a process for recovering an aldehyde from the gaseous product obtained by the hydroformylation of an olefinically unsaturated compound in a reactor R at elevated temperature and pressure while using a rhodium catalyst, the improvement which comprises: (a) introducing said gaseous product, without being cooled or depressured, from the hydroformylation reactor R into a distillation column D for distillation in countercurrent with a liquid phase; (b) cooling the top fraction from said column D in a condenser K so that the greater part of the aldehyde contained therein is condensed; (c) separating the condensate in a separator A into a gas phase and a liquid phase; (d) separating off a portion of the gas phase from A as a waste gas, and then bringing the remaining portion of the gas phase from A to the hydroformylation pressure by means of a compressor P and returning it to the reactor R as a recycle gas; (e) returning the liquid phase from separator A to an upper part of the distillation column D to flow countercurrently with respect to the gaseous product; and (f) taking off the aldehyde from a lower part of column D.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1 which further comprises taking off the aldehyde from column D as a liquid bottoms product.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1 which further comprises taking off the aldehyde from column D as a vaporous side stream.
Claim 5
Dependent Claim
32 words
A process as claimed in claim 1 which further comprises taking off the aldehyde from column D in part as a liquid bottoms product and in part as a vaporous side stream.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1 wherein the olefinically unsaturated compound is a C 2 - to C 4 -olefin.
Claim 7
Dependent Claim
14 words
A process as claimed in claim 1 wherein the olefinically unsaturated compound is ethylene.
Claim 8
Dependent Claim
14 words
A process as claimed in claim 1 wherein the olefinically unsaturated compound is propylene.
Claim 9
Dependent Claim
39 words
A process as claimed in claim 5 carried out with a distillation column D of about 4 to 12 theoretical plates, the temperature at the top of said column D being about 50°-140° C., corresponding to the hydroformylation temperature.
Claim 10
Dependent Claim
24 words
A process as claimed in claim 8 wherein about 1-5% by volume of the recycled gas is withdrawn from the system as waste gas.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |