Answer. Ammonia is recovered from ammonium chloride solution produced in the carbonated tower and calcium hydroxide formed in lime kiln. Both of these are pumped to the top of the ammonia recovery tower. Steam is introduced from the base of the tower for heating purposes. Ammonia is recovered from NH4C1 as:
2NH4C1 + Ca(OH)2 ———> 2NH3 + CaCl2 + 2H2O