US4624842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature controlled ammonia synthesis process
Assignee: CF Braun and Co
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Filing: 1985-04-08
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Granted: 1986-11-25
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Expires: 2005-04-08
Abstract
Abstract A process for synthesizing ammonia with improved efficiency is disclosed. The increase in efficiency is achieved by regulation of the temperature of at least three catalyst beds connected in series by a combination of influent/affluent heat exchange and high pressure heat sinks.
Inventors
- 👤 Bernard J. Grotz, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:55
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/04; B; B01; B01J; B01J8/00; B01J8/02; B01J8/04; B01J8/0446; B01J8/0449; B01J8/0457; C01C1/0405; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
A process for the synthesis of ammonia carried out at a pressure greater than 100 atmospheres which process comprises passing a mixture of gases in continuous flow through apparatus so as to carry out the following steps: (a) passing at least a portion of an ammonia feed syngas through a heat exchanger to increase its temperature; (b) passing said feed syngas from (a) through a first ammonia synthesis catalyst bed to obtain an effluent; (c) passing at least a portion of the effluent from (b) through the heat exchanger of (a) to decrease the temperature of said effluent; (d) passing the effluent from (c) through a series of at least two additional ammonia synthesis catalyst beds and then subsequent to each bed through a high temperature heat sink to decrease the temperature of the effluent and to obtain a final product effluent; and (e) recovering ammonia from the final product effluent of the series in (d).
Claim 2
Dependent Claim
156 words
A process for the synthesis of ammonia carried out at a pressure greater than 100 atmospheres which process comprises passing a mixture of gases in continuous flow through apparatus so as to carry out the following steps: (a) passing at least a portion of an ammonia feed syngas through a heat exchanger to increase its temperature; (b) passing said feed syngas from (a) through a first ammonia synthesis catalyst bed to obtain an effluent; (c) passing at least a portion of the effluent from (b) through the heat exchanger of (a) to decrease the temperature of said effluent; (d) passing the effluent from (c) through a series of at least two additional ammonia synthesis catalyst beds and then subsequent to each bed through a high temperature heat sink to decrease the temperature of the effluent and to obtain a final product effluent; and (e) recovering ammonia from the final product effluent of the series in (d).
Claim 3
Dependent Claim
24 words
A process as recited in claim 1 wherein the process is carried out at a temperature between approximately 150 atmospheres to about 200 atmospheres.
Claim 4
Dependent Claim
19 words
A process as recited in claim 1 wherein the high temperature heat sink is comprised of a steam superheater.
Claim 5
Dependent Claim
22 words
A process as recited in claim 1 wherein the high temperature heat sink is comprised of a boiler feed water heating system.
Claim 6
Dependent Claim
32 words
A process as recited in claim 1 which includes heat exchange between at least a portion of the final product effluent in (d) and at least a portion of the feed syngas.
Claim 7
Independent Claim
99 words
A method of improving yield in a process for the synthesis of ammonia carried out at a pressure greater than 100 atmospheres, which method comprises (a) at least three catalyst beds in series over which the ammonia feed syntas passes in continuous flow; (b) controlling the temperature of the feed syngas from the first catalyst bed by means of heat exchange with the feed syngas to the first catalyst bed; and (c) controlling the temperature of effluent from all subsequent catalyst beds in series by means of a high temperature heat sink in series with the effluent of each.
Claim 8
Independent Claim
99 words
A method of improving yield in a process for the synthesis of ammonia carried out at a pressure greater than 100 atmospheres, which method comprises (a) at least three catalyst beds in series over which the ammonia feed syntas passes in continuous flow; (b) controlling the temperature of the feed syngas from the first catalyst bed by means of heat exchange with the feed syngas to the first catalyst bed; and (c) controlling the temperature of effluent from all subsequent catalyst beds in series by means of a high temperature heat sink in series with the effluent of each.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |