Ammonia synthesis process

摘要

An exothermic gas phase reaction, especially synthesis of ammonia or methanol, is carried out by passing the reactant gas over a catalyst in a first zone in heat exchange with a coolant and then in a second, adiabatic zone and then passing reacted gas directly to a heat recovery zone. Such a sequence of zones affords a higher output of product and better heat recovery than in many previously used sequences, especially when the heat available from the cooled zone is used to pre-heat reactant gas and the heat removed from the gas leaving the adiabatic zone is used in high-grade recoveries such as high pressure steam generation.