US3868417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of acrylic acid from the reaction gases from propylene or acrolein oxidation
Assignee: BASF SE
•
Filing: 1973-08-23
•
Granted: 1975-02-25
•
Expires: 1993-08-23
Abstract
Abstract On the separation of acrylic acid from reaction gases from the oxidation of propylene or acrolein a countercurrent absorption is carried out with at least 8 parts by weight of carboxylic ester per part by weight of acrylic acid contained in the reaction gas, the dissolved acetic acid and the dissolved water are substantially completely expelled from the resulting absorption solution at elevated temperature by means of inert gases, the loaded inert gases are passed to the countercurrent absorption for the recovery of the acrylic acid contained therein, and the acrylic acid is distilled off under reduced pressure from the carboxylic ester solution which is free from acetic acid and water.
Inventors
- 👤 Gerd Duembgen
- 👤 Heinz Engelbach
- 👤 Walter Frey
- 👤 Richard Krabetz
- 👤 Ulrich Lebert
- 👤 Fritz Triessen
- 👤 Carl-Heinz Willersinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:57
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1487; B01D53/1493; C07C51/42; C07C51/48; Y; Y10; Y10S; Y10S203/00; Y10S203/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A PROCESS FOR THE SEPARATION OF ACRYLIC ACID FROM REACTION GASES FROM THE OXIDATION OF PROPYLENE OR ACROLEIN BY COUNTERCURRENT ABSORPTION WITH CARBOXYLIC ESTERS OF MELTING POINT LESS THAN 30*C AND BOILING POINT UNDER NORMAL PRESSURE OF FROM 160* TO 360*C AT TEMPERATURE OF 50** TO 80*C AND PRESSURE OF 0.5 TO 5 BARS, FROM 10 TO 20 PARTS BY WEIGHT OF CARBOXYLIC ESTER BEING USED PER PART BY WEIGHT OF ACRYLIC ACID IN THE REACTION GAS, WHEREIN THE DISSOLVED ACETIC ACID AND THE DISSOLVED WATER ARE SUBSTANTIALLY COMPLETELY EXPELLED FROM THE RESULTING ABSORPTION SOLUTION AT 90* TO 140*C AND 0.5 TO 5 BARS BY MEANS OF INERT GASES, THE LOADED INERT GASES ARE PASSED TO THE COUNTER CURRENT ABSORPTION FOR THE RECOVERY OF THE ACRYLIC ACID CONTAINED IN THEM AND THE ACRYLIC ACID IS DISTILLED OFF FROM THE WATER-FREE AND ACETIC ACID-FREE CARBOXYLIC ESTER SOLUTION AT 0.04 TO 0.1 BAR.
Claim 2
Dependent Claim
151 words
A PROCESS FOR THE SEPARATION OF ACRYLIC ACID FROM REACTION GASES FROM THE OXIDATION OF PROPYLENE OR ACROLEIN BY COUNTERCURRENT ABSORPTION WITH CARBOXYLIC ESTERS OF MELTING POINT LESS THAN 30*C AND BOILING POINT UNDER NORMAL PRESSURE OF FROM 160* TO 360*C AT TEMPERATURE OF 50** TO 80*C AND PRESSURE OF 0.5 TO 5 BARS, FROM 10 TO 20 PARTS BY WEIGHT OF CARBOXYLIC ESTER BEING USED PER PART BY WEIGHT OF ACRYLIC ACID IN THE REACTION GAS, WHEREIN THE DISSOLVED ACETIC ACID AND THE DISSOLVED WATER ARE SUBSTANTIALLY COMPLETELY EXPELLED FROM THE RESULTING ABSORPTION SOLUTION AT 90* TO 140*C AND 0.5 TO 5 BARS BY MEANS OF INERT GASES, THE LOADED INERT GASES ARE PASSED TO THE COUNTER CURRENT ABSORPTION FOR THE RECOVERY OF THE ACRYLIC ACID CONTAINED IN THEM AND THE ACRYLIC ACID IS DISTILLED OFF FROM THE WATER-FREE AND ACETIC ACID-FREE CARBOXYLIC ESTER SOLUTION AT 0.04 TO 0.1 BAR.
Claim 3
Dependent Claim
165 words
A process for the separation of acrylic acid from reaction gases from the oxidation of propylene or acrolein by countercurrent absorption with carboxylic esters of melting point less than 30*C and boiling point under normal pressure of from 160* to 360*C at temperatures of 50* to 80*C and pressures of 0.5 to 5 bars, from 10 to 20 parts by weight of carboxylic ester being used per part by weight of acrylic acid in the reaction gas, wherein the dissolved acetic acid and the dissolved water are substantially completely expelled from the resulting absorption solution at 90* to 140*C and 0.5 to 5 bars by means of from 10 to 50% by volume, based on the volume of the reaction gas, of inert gases, the loaded inert gases are passed to the countercurrent absorption for the recovery of the acrylic acid contained in them and the acrylic acid is distilled off from the water-free and acetic acid-free carboxylic ester solution at 0.4 to 0.1 bar.
Claim 4
Dependent Claim
165 words
A process for the separation of acrylic acid from reaction gases from the oxidation of propylene or acrolein by countercurrent absorption with carboxylic esters of melting point less than 30*C and boiling point under normal pressure of from 160* to 360*C at temperatures of 50* to 80*C and pressures of 0.5 to 5 bars, from 10 to 20 parts by weight of carboxylic ester being used per part by weight of acrylic acid in the reaction gas, wherein the dissolved acetic acid and the dissolved water are substantially completely expelled from the resulting absorption solution at 90* to 140*C and 0.5 to 5 bars by means of from 10 to 50% by volume, based on the volume of the reaction gas, of inert gases, the loaded inert gases are passed to the countercurrent absorption for the recovery of the acrylic acid contained in them and the acrylic acid is distilled off from the water-free and acetic acid-free carboxylic ester solution at 0.4 to 0.1 bar.
Claim 5
Dependent Claim
165 words
A process for the separation of acrylic acid from reaction gases from the oxidation of propylene or acrolein by countercurrent absorption with carboxylic esters of melting point less than 30*C and boiling point under normal pressure of from 160* to 360*C at temperatures of 55* to 70*C and pressures of 1 to 2 bars, from 10 to 20 parts by weight of carboxylic ester being used per part by weight of acrylic acid in the reaction gas, wherein the dissolved acetic acid and the dissolved water are substantially completely expelled from the resulting absorption solution at 110* to 130*C and 0.5 to 5 bars by means of from 15 to 30% by volume, based on the volume of the reaction gas, of inert gases, the loaded inert gases are passed to the countercurrent absorption for the recovery of the acrylic acid contained in them and the acrylic acid is distilled off from the water-free and acetic acid-free carboxylic ester solution at 0.04 to 0.1 bar.
Claim 6
Dependent Claim
165 words
A process for the separation of acrylic acid from reaction gases from the oxidation of propylene or acrolein by countercurrent absorption with carboxylic esters of melting point less than 30*C and boiling point under normal pressure of from 160* to 360*C at temperatures of 55* to 70*C and pressures of 1 to 2 bars, from 10 to 20 parts by weight of carboxylic ester being used per part by weight of acrylic acid in the reaction gas, wherein the dissolved acetic acid and the dissolved water are substantially completely expelled from the resulting absorption solution at 110* to 130*C and 0.5 to 5 bars by means of from 15 to 30% by volume, based on the volume of the reaction gas, of inert gases, the loaded inert gases are passed to the countercurrent absorption for the recovery of the acrylic acid contained in them and the acrylic acid is distilled off from the water-free and acetic acid-free carboxylic ester solution at 0.04 to 0.1 bar.
References Cited (Backward Citations)
US3432401A
Cited
US3344178A
Cited
US3507915A
Cited
US3555082A
Cited
US3553261A
Cited
US3666632A
Cited
US3527677A
Cited
US3798264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |