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US4013431A
Expired / Lapsed
US
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Partial or complete separation of gas mixtures, containing ammonia and carbon dioxide
Assignee: BASF SE
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Filing: 1974-04-01
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Granted: 1977-03-22
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Expires: 1994-04-01
Abstract
Abstract Gas mixtures containing ammonia and carbon dioxide are separated by fractional absorption in a solvent. The gas mixture and solvent are intimately mixed in a zone, the residence time of the gas in the mixing zone being restricted to a maximum of 0.1 second. Non-absorbed gas and solvent are then separated from one another and the gas separated off is subjected to a further absorption if necessary.
Inventors
- 👤 Wilhelm Berkel
- 👤 Hans Gettert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:17
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/12; C01B; C01B32/00; C01B32/50; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
A process for the separation of a gas mixture containing ammonia and carbon dioxide by absorption in a solvent, which process comprises carrying out the absorption of said gas mixture in a mixing zone in which water as the solvent and said gas mixture are intimately mixed and thereafter separating non-absorbed gas mixture and water from one another, the residence time of the gas in the mixing zone being limited to a maximum of 0.1 second in order to absorb the ammonia to a substantially greater extent than the carbon dioxide.
Claim 2
Dependent Claim
91 words
A process for the separation of a gas mixture containing ammonia and carbon dioxide by absorption in a solvent, which process comprises carrying out the absorption of said gas mixture in a mixing zone in which water as the solvent and said gas mixture are intimately mixed and thereafter separating non-absorbed gas mixture and water from one another, the residence time of the gas in the mixing zone being limited to a maximum of 0.1 second in order to absorb the ammonia to a substantially greater extent than the carbon dioxide.
Claim 3
Dependent Claim
43 words
A process as claimed in claim 1 wherein the non-absorbed gas mixture is subjected to a renewed absorption with water in at least one subsequent additional mixing zone, using a residence time of not more than 0.1 second in each additional mixing zone.
Claim 4
Dependent Claim
24 words
A process as claimed in claim 1 wherein the temperature of the water issuing from the mixing zone is kept at -5° to +50°C.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1 wherein the temperature of the water issuing from the mixing zone is kept at 10°to 40°C.
Claim 6
Dependent Claim
50 words
A process as claimed in claim 1 wherein the ammonia and the carbon dioxide are desorbed from the water withdrawn from the mixing zone by heating, the gas mixture obtained by desorption is cooled to give a concentrated ammonium carbamate solution and the non-absorbed ammonia is separated from this solution.
Claim 7
Dependent Claim
30 words
A process as claimed in claim 5 wherein the ammonium carbamate solution is again evaporated and recycled to the mixing zone together with fresh gases containing ammonia and carbon dioxide.
Claim 8
Dependent Claim
30 words
A process as claimed in claim 1 wherein said gas mixture consists essentially of at least 5% by volume of carbon dioxide and at least 10% by volume of ammonia.
Claim 9
Dependent Claim
30 words
A process as claimed in claim 1 wherein said gas mixture consists essentially of 5 to 40% by volume of carbon dioxide and 60 to 95% by volume of ammonia.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |