Distillation process for synthesizing

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 DOXIDE AND AMMONIA UPWARDLY IN THE REACTION ZONE AND COUNTERCURRENTLY TO AN AQUEOUS STREAM CONTAINING AMMONIUM CARBAMATE AND UREA, REACTING THE CARBON DIOXIDE AND AMMONIA IN THE UPPER PORTION OF THE REACTION ZONE TO FORM SAID AMMONIUM CARBAMATE AND UREA, PASSING SAID STREAM DOWNWARDLY THROUGH SAID STRIPPING ZONE COUNTERCURRENTLY TO THE AMMONIA INTRODUCEDTHERETO TO DECOMPOSE THE CARBAMATE TO CARBON DIOXIDE AND AMMONIA, AND VAPORIZATION OF SOME WATER FOR PASSAGE WITH THE AMMONIA FED INTO THE REACTION ZONE, PASSING AN OVERHEAD STREAM OF UNREACTED CARBON DIOXIDE, AMMONIA AND WATER VAPOR FROM SAID REACTION ZONE INTO A CONDENSING ZONE AND RETURNING TO THE REACTION ZONE SUBSTANTIALLY ALL THE COOLED STREAM INCLUDING AMMONIUM CARBAMATE FORMED BY THE COOLING SO THAT SUCH CARBAMATE IS CARRIED BY THE DOWN-FLOWING LIQUID STREAM IN THE REACTION ZONE, HEATING THE STRIPPING ZONE TO SUPPLEMENT THE EFFECT OF THE AMMONIA IN PROMOTING DECOMPOSITION OF CARBAMATE TO CARBON DIOXIDE AND WATER, MAINTAINING THE REACTION AND STRIPPING ZONES AT SUBSTANTIALLY THE SAME PRESSURE, AND WITHDRAWING THE UREA FROM THE STRIPPING ZONE.