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Ammonia synthesis takes place on an iron catalyst at a pressure of 100-250 bar and temperature of 350-550 oC according to the following reaction (IPTS/EC, 2007 p.43): N 2 + 3H 2 ↔ 2NH 3, ΔΗ ο = - 46 kJ/mol Only about 20-30% of the synthesis gas is converted to ammonia due to unfavorable equilibrium conditions. The ammonia produced is separated by cooling/condensation. After the ammonia formed is removed, the unreacted gas is recycled back to the converter and the reacted gas is compensated with new make-up synthesis gas.