Recovery of ammonia and pyridine

Claim 1

THE METHOD OF RECOVERING AMMONIA AND PYRIDINE FROM COKE OVEN GASES, SAID AMMONIA BEING RECOVERED AS DIAMMONIUM ORTHOPHOSPHATE, WHICH METHOD COMPRISES PASSING SAID GASES THROUGH A FIRST ABSORBING ZONE IN CONTACT WITH AN AQUEOUS PHOSPHORIC ACID SOLUTION SATURATED WITH RESPECT TO DIAMMONIUM ORTHOPHOSPHATE AND MAINTAINED AT A PH BETWEEN ABOUT 5 AND ABOUT 8 TO REMOVE A PREDOMINANT PROPORTION OF THE AMMONIA FROM SAID GASES AND TO PRECIPITATE DIAMMONIUM ORTHOPHOSPHATES FROM SAID SOLUTION, PASSING THE GASES FROM THE FIRST ABSORBING ZONE INTO A SECOND ABSORBING ZONE IN CONTACT WITH AN AQUEOUS PHOSPHORIC ACID SOLUTION MAINTAINED AT A PH BELOW ABOUT 3.0 TO REMOVE A PREDOMINANT PROPORTION OF SAID PYRIDINE AND A PREDOMINANT PROPORTION OF THE REMAINING AMMONIA, AND THEREAFTER PASSING AMMONIA INTO THE SOLUTION FORMED IN THE SECOND ABSORBING ZONE, THEREBY CAUSING SEPARATION OF A NON-AQUEOUS PHASE COMPRISING PYRIDINE.

Claim 2

THE METHOD OF RECOVERING AMMONIA AND PYRIDINE FROM COKE OVEN GASES, SAID AMMONIA BEING RECOVERED AS DIAMMONIUM ORTHOPHOSPHATE, WHICH METHOD COMPRISES PASSING SAID GASES THROUGH A FIRST ABSORBING ZONE IN CONTACT WITH AN AQUEOUS PHOSPHORIC ACID SOLUTION SATURATED WITH RESPECT TO DIAMMONIUM ORTHOPHOSPHATE AND MAINTAINED AT A PH BETWEEN ABOUT 5 AND ABOUT 8 TO REMOVE A PREDOMINANT PROPORTION OF THE AMMONIA FROM SAID GASES AND TO PRECIPITATE DIAMMONIUM ORTHOPHOSPHATES FROM SAID SOLUTION, PASSING THE GASES FROM THE FIRST ABSORBING ZONE INTO A SECOND ABSORBING ZONE IN CONTACT WITH AN AQUEOUS PHOSPHORIC ACID SOLUTION MAINTAINED AT A PH BELOW ABOUT 3.0 TO REMOVE A PREDOMINANT PROPORTION OF SAID PYRIDINE AND A PREDOMINANT PROPORTION OF THE REMAINING AMMONIA, AND THEREAFTER PASSING AMMONIA INTO THE SOLUTION FORMED IN THE SECOND ABSORBING ZONE, THEREBY CAUSING SEPARATION OF A NON-AQUEOUS PHASE COMPRISING PYRIDINE.