Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide
Patent
1978-08-07
1979-10-16
Vertiz, O. R.
Chemistry of inorganic compounds
Nitrogen or compound thereof
Ammonia or ammonium hydroxide
252376, C01C 104
Patent
active
041713435
ABSTRACT:
An improved startup procedure for the synthesis of ammonia in which preheated feed streams of desulfurized hydrocarbon gas, steam and air are routed through an ammonia train having a primary and secondary reformer, a high and low temperature CO shifter, a CO.sub.2 removal system, a methanator and a synthesis converter system. The improvement comprises simultaneously heating the primary and secondary reformers with steam while heating the low temperature CO shifter with preheated desulfurized hydrocarbon gas. After these systems have been heated sufficiently, feed streams of preheated desulfurized hydrocarbon gas and steam are injected into the reformers along with the addition of air into the secondary reformer to produce reformed gas which is then used to preheat the high temperature CO shifter. Simultaneously, exhaust gas from the low temperature CO shifter along with a portion of the gas converted in the high temperature CO shifter is used to preheat the CO.sub.2 removal system. Once these systems have been heated sufficiently, the preheated feed streams from the primary and secondary reformers are passed through the high temperature CO shifter, through the low temperature CO shifter, and through the CO.sub.2 removal system into a methanator in order to preheat it. From the methanator, the feed streams are passed into a preheated synthesis converter system wherein a converter vessel is heated to start the production of ammonia.
REFERENCES:
patent: 1893492 (1933-01-01), Brill
patent: 3309306 (1967-03-01), MacLaren
Faust Paul J.
Pless, Jr. Otto C.
Connelly Thomas J.
Gilkes Arthur G.
McClain William T.
Roy Thomas W.
Standard Oil Company (Indiana)
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