Preparation of ammonia synthesis gas
First Claim
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1. 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 fuel 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 said 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.
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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.
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Citations
8 Claims
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1. A process for producing ammonia synthesis gas which comprises:
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(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 fuel 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 said 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification