Ureaform fertilizer

Claim 1

IN A PROCESS FOR THE PRODUCTION OF PELLETIZED UREAFORMALDEHYDE FERTILIZER OF HIGH BULK DENSITY OF 36-46 LBS./ FT.3 INVOLVING REACTING UREA AND FORMALDEHYDE AS THE SOLE REACTANTS IN AQUEOUS SOLUTION TO PRECIPITATE FROM THE SOLUTION A REACTION PRODUCT OF UREA AND FORMALDEHYDE CONTAINING WATER-INSOLUBLE NITROGEN HAVING A HIGH ACTIVITY FOR USE AS A FERTILIZER FOLLOWED BY SEPARATING THE PRECIPITATE FROM THE SOLUTION TO PRODUCE A WET CAKE CONTAINING 5585% BY WEIGHT WATER WHICH ON DRYING TENDS TO BREAK EASILY INTO A POWDERY MASS OF LOW BULK DENSITY, THE IMPROVEMENT WHICH COMPRISES ADMIXING THE WET CAKE WITH ABOUT 2.5-4.5 ITS WEIGHT OF DRIED UREA-FORMALDEHYDE PRODUCT PREVIOUSLY PRODUCED N THE PROCESS AND HAVING A PARTICLE SIZE BELOW 48 MESH SIZE TO PRODUCE A MIXTURE CONTAINING 15-24% BY WEIGHT WATER, KNEADING AND PRESSING SAID MIXTURE OF WET CAKE AND DIRED UREA-FORMALDEHYDE FERTILIZER UNTIL A UNIFORM MASS IS PRODUCED, AND HEATING SAID UNIFORM MASS BY CONTACT WITH HEATED DRYING GAS IN A ROTARY DRIER TO DRYING TEMPERATURE NOT IN EXCESS OF 110* C. TO PRODUCE A DRY PELLETIZED PRODUCT HAVING A BULK DENSITY OF 36-46 LBS./FT.3.