EP0106076A2
Expired / Lapsed
EP
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Preparation of ammonia synthesis gas
Assignee: MW Kellogg Co
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Filing: 1983-08-24
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Granted: —
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Expires: 2003-08-24
Abstract
Abstract Ammonia synthesis gas having excess nitrogen is produced in a reactor-exchanger primary reformer followed by an autothermal secondary reformer wherein process air for the latter is preheated by heat exchange with gas turbine exhaust and the primary reformer is heated by synthesis gas from the secondary reformer.
Inventors
- 👤 Philip Shires
- 👤 John Cassata
- 👤 Bernard Mandelik
- 👤 Christiaan Van Dijk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/04; C01B; C01B3/00; C01B3/02; C01B3/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
A process for producing ammonia synthesis gas which comprises: a) introducing normally gaseous hydrocarbon fresh feed and steam to an endothermic, catalytic conversion zone operated under steam reforming conditions to produce primary reformed gas containing hydrogen, carbon oxides, methane, and steam; b). compressing air by centrifugal means driven by a gas turbine and heating the compressed air to a temperature in the range of from 700°C to 900°C by indirect heat exchange with exhaust gas from the gas turbine; c) introducing the primary reformed gas and the heated compressed air from step b) to an adiabatic, catalytic conversion zone operated under autothermal reforming conditions to produce raw, hot, ammonia synthesis gas; d) passing raw, hot, ammonia synthesis gas to the endothermic catalytic conversion zone in indirect heat exchange with the normally gaseous hydrocarbon and steam therein to provide the entire heat of conversion in the endothermic catalytic conversion zone; and e) recovering raw ammonia synthesis gas from the endothermic catalytic conversion zone.
Claim 2
Dependent Claim
162 words
A process for producing ammonia synthesis gas which comprises: a) introducing normally gaseous hydrocarbon fresh feed and steam to an endothermic, catalytic conversion zone operated under steam reforming conditions to produce primary reformed gas containing hydrogen, carbon oxides, methane, and steam; b). compressing air by centrifugal means driven by a gas turbine and heating the compressed air to a temperature in the range of from 700°C to 900°C by indirect heat exchange with exhaust gas from the gas turbine; c) introducing the primary reformed gas and the heated compressed air from step b) to an adiabatic, catalytic conversion zone operated under autothermal reforming conditions to produce raw, hot, ammonia synthesis gas; d) passing raw, hot, ammonia synthesis gas to the endothermic catalytic conversion zone in indirect heat exchange with the normally gaseous hydrocarbon and steam therein to provide the entire heat of conversion in the endothermic catalytic conversion zone; and e) recovering raw ammonia synthesis gas from the endothermic catalytic conversion zone.
Claim 3
Dependent Claim
76 words
The process of claim 1 wherein the steam to C 1 ratio in respect of fresh feed introduced to the endothermic, catalytic conversion zone is from 2.5 to 4.5 and normally gaseous hydrocarbon fresh feed is introduced to the adiabatic, catalytic conversion zone in admixture with primary reformed gas and supplemental steam such that the overall steam to C 1 ratio in the adiabatic, catalytic conversion zone based on available hydrocarbon is from 2 to 3.
Claim 4
Dependent Claim
35 words
The process of claim 2 wherein the fresh feed introduced to the endothermic, catalytic conversion zone and the fresh feed introduced to the adiabatic catalytic conversion zone are in the ratio from 1:1 to 3:1.
Claim 5
Dependent Claim
35 words
The process of either claim 1 or claim 2 wherein exhaust gas from the gas turbine is additionally heated by combustion of supplementary fuel added thereto prior to indirect heat exchange with the compressed air.
Claim 6
Dependent Claim
43 words
The process of either claim 1 or claim 2 wherein raw ammonia synthesis gas recovered from the endothermic catalytic conversion zone is passed in indirect heat exchange with at least a portion of the fresh feed introduced to the endothermic, catalytic conversion zone.
Claim 7
Dependent Claim
64 words
The process of claim 2 which additionally comprises: a) treating raw ammonia synthesis gas by the steps of shift conversion, methanation, and carbon dioxide removal o produce ammonia synthesis gas; b) compressing ammonia synthesis gas and introducing the gas to an ammonia synthesis loop comprising a catalytic ammonia converter, means for recovering ammonia product, and recycle gas compression means; and c) recovering ammonia product.
Claim 8
Dependent Claim
19 words
The process of claim 6 wherein nitrogen is removed from ammonia synthesis gas prior to compressing ammonia synthesis gas.
Claim 9
Dependent Claim
38 words
The process of claim 6 wherein a purge gas containing hydrogen, nitrogen, and methane is withdrawn from _ the ammonia synthesis loop and a hydrogen-rich stream is recovered from thepurge. stream and reintroduced to the ammonia synthesis loop.
References Cited (Backward Citations)
No citation records indexed.
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