Process and converter for the preparation of ammonia

C - Chemistry – Metallurgy – 01 – C

Patent

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C01C 1/04 (2006.01) B01J 8/00 (2006.01) B01J 8/04 (2006.01)

Patent

CA 2321599

Process for the preparation of ammonia, wherein three separate streams of fresh ammonia synthesis gas are used. The ammonia converter contains at least two catalyst beds connected in series. The second and third synthesis gas streams are passed through heat exchanger steps, where they are heated by effluent streams from the first catalyst bed. The preheated streams are mixed with the first synthesis gas stream and are fed to the first catalyst bed. The partly converted synthesis gas is used to heat the second and third stream and is fed to at least the second catalyst bed.

La présente invention concerne un procédé de préparation d'ammoniaque, dans lequel on utilise trois courants séparés de gaz ammoniac de synthèse frais. Le convertisseur d'ammoniaque contient au moins deux lits catalytiques reliés en série. Les deuxième et troisième courants de gaz de synthèse sont amenés à passer par un cycles d'étapes dans un échangeur de chaleur, où ils sont chauffés par des courants effluents provenant du premier lit catalytique. Les courants préchauffés sont d'abord mélangés avec le premier courant de gaz de synthèse, puis alimentés dans le premier lit catalytique. Le gaz de synthèse partiellement converti est utilisé pour chauffer les premier et deuxième courants puis est alimenté dans au moins le deuxième lit catalytique.

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