Different processes are used for producing AN, anyway most of the plants are based on Ammosidetion of propylene.


The reaction takes place in vapor phase in presence of catalyst.


For a plant capacity of 120000 TPY, the approximate quantity of raw materials are: Propylene 127.000 TPY and Ammonia 62.000 TPY. The main by-products are HCN, Carbon oxides and Acetonnitrile. The latter one can be recovered and used as solvent for rubber production, while HCN can be used for production of methylmetacrylate. In the process, air, ammonia and propylene are introduced into the catalytic fluid bed reactor operating at about 2 bar g and about 450 °C.


Ammonia and air are feed in excess of stoichiometric proportion because an excess of NH3 helps the reaction an the air regenerates the catalyst permanently. The most important characteristics of the process is the high conversion at once - through basis, in few seconds residence time, in the reactor. The reaction is highly exothermic and the heat generated produces HP steam.


The gas coming for the reactor are sent to a quenching tower where H2SO4 is also introduced to neutralized unconverted ammonia.


Product stream enters into countercurrent water absorber to separate inert gases from reaction products. A final product is obtained in purification section.


© Ing. A. Maurer S.A.





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