Abstract: 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.

Abstract: Process for the preparation of ammonia at elevated pressure and temperature in an ammonia reactor, comprising passing a process stream of ammonia synthesis gas successively through at least three catalyst beds and reacting the synthesis gas in the beds;intermediately cooling of partially reacted synthesis gas leaving the catalyst beds by heat exchange in heat exchangers arranged between each catalyst bed and withdrawing a product effluent being rich in ammonia, wherein the process stream is obtained by combining prior to introduction into a first catalyst bed, a first feed stream of synthesis gas having been preheated through indirect heat exchange during the intermediate cooling of the partially converted synthesis gas, a second feed stream of synthesis gas having been preheated by indirect heat exchange with the product effluent, and a third feed stream of synthesis gas for adjustment of temperature of the process stream and wherein the first feed stream is passed successively through the interbed heat exch