Innovation in Process for Manufacturing of Water Soluble Urea Phosphate

摘要

Urea phosphate of 17-44-0 (N-P2O5-K2O wt%) grade is an organic compound composed of carbon, hydrogen, nitrogen, oxygen and phosphorus. The complexity in manufacturing arises due to the quality of phosphoric acid and this offers distinct advantage of optimizing the various process parameters for increasing yield, quality and efficiency in the process. IFFCO has carried out various experiments and developed a process suitable for industrial production. Urea phosphate yield increases with decrease in crystallization temperature. High yield is obtained with crystallization retention time of 2 to 3 hours. Crystallization temperature of 25 °C is optimum for a better crystal size with quality yield. Pre-heating of phosphoric acid favours crystallization and excellent crystallization takes place with different P2O5 concentrations when phosphoric acid temperature is increased to 70-75 °C. Optimising the air distribution system in dryer with proper flight arrangement and retention time helps in maintaining dry product with moisture up to 0.5%. Based on the inferences of the experiments, a 50 MTPD plant has been successfully designed and is in operation at IFFCO - Kandla, Gujarat.