Recovery of nh3 from a gaseous mixture containing nh3 and hcn

Claim 1

THE PROCESS OF RECOVERING AMMONIA A MIXTURE OF GASES CONTAINING AMMONIA AND HCN WHICH COMPRISES PASSING SAID MIXTURE THROUGH AN AQUEOUS ABSORBING SLOUTION OF AMMONIUM HYDROGEN PHOSPHATE, WHEREBY SLUBSTANTIALLY ALL OF THE AMMONIA AND A MINOR PORTION OF THE HCN ARE ABSORBED IN SAID SOLUTION AND A MINOR PORTION OF THE OF THE HCN PASSES UNABSORBED FROM SAID SOLUTION, SUBSEQUENTLY PASSING THROUGH THE SOLUTION RESSULTING FROM THE ABOVE STEP SUCH AN AMOUNT OF STEAM AS TO REMOVE ABSORBED HCN BUT ONLY A MINOR PROPORTION OF THE ABSORBED AMMONIA THEREFROM, SUBJECTING THE RESULTING SOLUTION TO HEATING TO STRIP REMAINING AVAILABLE AMMONIA THEREFROM, AND COLLECTING THE AMMONIA STRIPPED FROM SAID SOLUTIUON IN SAID LAST STEP.