Sxpaf

Claim 1

THE PROCESS FOR SYNTHESIZING UREA THAT INCLUDES FEEDING AMMONIA INTO A STRIPPING ZONE FOR UPWARD FLOW THEREIN INTO A REACTION ZONE, FEEDING CARBON DIOXIDE INTO THE LOWER PORTION OF THE REACTION ZONE FOR ADMIXTURE WITH AMMONIA FROM THE STRIPPING ZONE AND FLOWING THE CARBON DIOXIDE AND AMMONIA CONCURRENTLY IN AN AQUEOUS STREAM UPWARDLY THROUGH THE REACTION ZONE AND THEREIN REACTING THE CARBON DIOXIDE AND AMMONIA TO FORM AMMONIUM CARBAMATE AND UREA, PASSING SAID QUEOUS STREAM INCLUDING LIQUID AND GASEOUS COMPONENTS FROM THE REACTION ZONE INTO A SEPARATING ZONE, PASSING THE SEPARATED LIQUID INCLUDING AMMONIA CARBAMATE AND UREA FROM SAID SEPARATING ZONE TO SAID STRIPPING ZONE, PASSING A STREAM OF SEPARATED CARBON DIOXIDE AND AMMONIA FROM SAID SEPARATING ZONE THROUGH A CONDENSING ZONE AND RETURNING TO THE REACXTION ZONE THE COOLED CONDENSING ZONE EFFLUENT, HEATING THE STRIPPING ZONE LIQUID TO SUPPLEMENT THE EFFECT OF THE AMMONIA IN PROMOTING CONVERSION OF CARBAMATE TO CARBON DIOXIDE AND AMMONIA, MAINTAINING THE REACTION AND STRIPPING ZONES AT SUBSTANTIALLY THE SAME PRESSURE, AND WITHDRAWING THE UREA FROM THE STRIPPING ZONE.