US4474740A
Expired / Lapsed
US
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Method for regenerating physically acting organic scrubbing agents
Assignee: Linde GmbH
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Filing: 1982-10-18
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Granted: 1984-10-02
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Expires: 2002-10-18
Abstract
Abstract Method and apparatus for regenerating physically acting organic scrubbing agents laden with sulfur dioxide and/or sulfur trioxide and eventually carbon dioxide in the course of a gas purification process. Equipment costs and energy losses are reduced by adding ammonia and, if necessary, water, to the laden scrubbing fluids and then separating the resultant ammonia sulfite and/or ammonia sulfate. Large differences in temperature between the scrubbing steps and the regenerating steps are not needed. A beneficial energy balance results.
Inventors
- 👤 Heinz Karwat
- 👤 Peter Haussinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:12
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1425; B01D53/1456; B01D53/1475; B01D53/1481; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/507; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
125 words
A process for regenerating dimethylformamide used to scrub flue gas containing sulfur-based contaminants comprising the steps of flowing dimethylformamide into a scrubbing column to induce contact with flue gas contained therein so that the dimethylformamide becomes laden with sulfur-based contaminants and carbon dioxide previously found in the flue gas, supplying the laden scrubbing fluid to a carbon dioxide stripper, the stripper degasifying dissolved carbon dioxide, supplying the laden fluid to a reactor, dousing the fluid in the reactor with ammonia and water, mixing the contents of the reactor with a stirring mechanism thereby forming ammonium sulfite and ammonium sulfate salts suspended in the mixture, filtering the mixture to remove the salts and providing the scrubber with the filtrate, the filtrate providing a regenerated scrubbing agent.
Claim 2
Dependent Claim
125 words
A process for regenerating dimethylformamide used to scrub flue gas containing sulfur-based contaminants comprising the steps of flowing dimethylformamide into a scrubbing column to induce contact with flue gas contained therein so that the dimethylformamide becomes laden with sulfur-based contaminants and carbon dioxide previously found in the flue gas, supplying the laden scrubbing fluid to a carbon dioxide stripper, the stripper degasifying dissolved carbon dioxide, supplying the laden fluid to a reactor, dousing the fluid in the reactor with ammonia and water, mixing the contents of the reactor with a stirring mechanism thereby forming ammonium sulfite and ammonium sulfate salts suspended in the mixture, filtering the mixture to remove the salts and providing the scrubber with the filtrate, the filtrate providing a regenerated scrubbing agent.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the ammonia is added to the scrubbing fluid in a gaseous state.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the ammonia is added to the scrubbing fluid in a liquid state.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the ammonia is added to only a portion of the scrubbing fluid.
Claim 6
Dependent Claim
22 words
The process of claim 1 further comprising cooling the scrubbing fluid to precipitate the ammonium sulfate before filtering the precipitated ammonium sulfate.
Claim 7
Dependent Claim
27 words
The process of claim 1 further comprising the step of removing water from the flue gas prior to scrubbing by cooling the flue gas to -50° C.
Claim 8
Dependent Claim
19 words
The process of claim 1 further comprising the step of cooling the dimethylformamide to -50° C. prior to scrubbing.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the sulfur-based contaminants consist of sulfur dioxide, sulfur trioxide and sulfuric acid.
Claim 10
Dependent Claim
29 words
The process of claim 1 further comprising the step of supplying air at a temperature of -50° C. to the carbon dioxide stripper to further the goal of degasification.
Claim 11
Dependent Claim
27 words
A process of claim 1 wherein the sulfur based contaminants consist of sulfur dioxide and sulfur trioxide and further comprising adding only ammonia to the laden dimethylformamide.
Claim 12
Dependent Claim
35 words
The process of claim 10 wherein the ammonia is added to the scrubbing fluid in amounts small enough to maintain transposition of sulfur dioxide or sulfur trioxide, without allowing ammonia to escape into the atmosphere.
Claim 13
Dependent Claim
35 words
The process of claim 10 wherein only a part of the scrubbing fluid is regenerated so that a low level of sulfur dioxide and sulfur trioxide is constantly maintained thereby rendering the process more economical.
Claim 14
Dependent Claim
16 words
The process of claim 10 further comprising the step of adding water to the laden dimethylformamide.
Claim 15
Dependent Claim
27 words
The process of claim 10 further comprising cooling the dimethylformamide to precipitate the ammonium sulfate and ammonium sulfite before filtering the precipitated ammonium sulfite and ammonium sulfate.
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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |