US4149857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the two-stage separation of ammonia
Assignee: Leuna Werke Walter Ulbright Germany VEB
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Filing: 1978-03-06
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Granted: 1979-04-17
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Expires: 1998-03-06
Abstract
Abstract The invention relates to a process for the separation of condensable and absorbable gas components having a critical temperature above 30° C. from a mixture with inert gases, being absorbable at most in a little measure and the proportions of the components of said mixture varying widely, by two-stage absorption and simultaneous compression of the cleaned gas and the separated components to different pressures, in which the varying composition of the gas mixture to be separated is equalized in a first absorption stage so that at least temporarily part of the absorbable components of the mixture is absorbed. The remaining gas mixture is compressed and then introduced into a second absorption stage, wherein are obtained an inert gas mixture largely free from absorbable components and a solution rich in absorbable components, from which the absorbable components of the gas mixture are separated through subsequent multi-stage thermal desorption, the absorbent being fed back into the process.
Inventors
- 👤 Wilfried Volke
- 👤 Hans Forster
- 👤 Egon Wolters
- 👤 Rainer Paulusch
- 👤 Horst Radon
- 👤 Karsten Kalb
- 👤 Jurgen Franke
- 👤 Hans-Jurgen Kohl
- 👤 Karl-Lothar Rumenapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:22
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1406; B01D53/1425; C; C01; C01C; C01C1/00; C01C1/02; C01C1/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
In a method of separating ammonia from a mixture of ammonia and hydrogen, said mixture varying widely in the proportions of the component gases contained within it, which method comprises delivering said mixture to a first absorption stage and absorbing ammonia therein, compressing the mixture exiting said first absorption stage in a turbo-compressor and delivering the compressed mixture to a second absorption stage in which absorption of ammonia is completed, delivering the absorbent from said second absorption stage to desorption means to separate the absorbent and the absorbed ammonia and returning the absorbent to said absorption stages for reuse, the improvement comprising maintaining a large absorbent content in said first stage to reduce substantially the variations in the proportions of the components of said mixture exiting said first absorption stage.
Claim 2
Dependent Claim
130 words
In a method of separating ammonia from a mixture of ammonia and hydrogen, said mixture varying widely in the proportions of the component gases contained within it, which method comprises delivering said mixture to a first absorption stage and absorbing ammonia therein, compressing the mixture exiting said first absorption stage in a turbo-compressor and delivering the compressed mixture to a second absorption stage in which absorption of ammonia is completed, delivering the absorbent from said second absorption stage to desorption means to separate the absorbent and the absorbed ammonia and returning the absorbent to said absorption stages for reuse, the improvement comprising maintaining a large absorbent content in said first stage to reduce substantially the variations in the proportions of the components of said mixture exiting said first absorption stage.
Claim 3
Dependent Claim
17 words
The method according to claim 1 in which the first and second absorption stages are indirectly cooled.
Claim 4
Dependent Claim
18 words
The method according to claim 1 in which the desorption stage consists of several stages with rectifying means.
Claim 5
Dependent Claim
24 words
The method according to claim 1 in which heating of the desorption stage is effected through heat obtained from other stages of the process.
Claim 6
Dependent Claim
38 words
the method according to claim 1 in which the first and second absorption stages are indirectly cooled by a refrigerant, evaporating at substantially constant pressure, involving closed circuit cooling of the refrigerant by evaporative cooling with cooling water.
Claim 7
Dependent Claim
22 words
The method according to claim 1 in which the first and second absorption stages are indirectly cooled by an isobarely evaporating refrigerant.
Claim 8
Dependent Claim
16 words
The method according to claim 6 in which pure absorbed matter is used as a refrigerant.
Claim 9
Dependent Claim
35 words
The method according to claim 1 in which the large absorbent content is maintained in a region of said first absorption stage located at a region at which said mixture is admitted to said stage.
Claim 10
Dependent Claim
45 words
The method according to claim 1 in which absorbent and absorbed gases are obtained from said first absorption stage and are delivered to a lower part of the second absorption stage than a part at which fresh absorbent is admitted to said second absorption stage.
Claim 11
Dependent Claim
55 words
The method according to claim 9 in which said absorbent and absorbed gases obtained from said first absorption stage are delivered to the second absorption stage at a region where the absorbed matter concentration of the fresh absorbent passing through the second absorption stage coincides with that of the absorbent from said first absorption stage.
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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |