PREPRATION OFAMMONIA

PROCESS FOR AMMONIA PRODUCTION

CHEMICAL REATION
     N2 + 2H3 = 2NH3                      H= -22.0 Kcal

RAW MATERIALS

1. H2 from synthesis gas.
2. N2 from air addition in susthesis gas process or from air liquifaction process.

PROCESS DISCRIPTION

Ammonia synthesis gas(3 moles pure H2 : 1 mole pure N2) is +

is compressed to the operating pressure (100-1000 atms,depending on conversion required). It is through a filter to remove compression oil and additionally through a high tempreature guard convertor( converts CO and CO2 to CH4 and removes traces of H2O,H2S,P ans As). This is done by catalyst and suitable materials.

The relatively cool gas is added along the outside if the converter tube walls to provide cooling so that carbon stell can be used for the thick wall pressure vessels and the internal tubes.The preheated gas flows next through the inside of tube which contains promoted porous iron catalyst at 500-550 celcius.The NH3 product ,with an 8-30% conversion depending on process conditions,is removed by condensastion ,first with water coooling and then NH3 refrigeration .The unconverted N2,H2 mixture is recirculated to allow an 85-95% yeild.