热法磷酸生产磷酸脲的工艺技术研究

采用热法磷酸和尿素作为原料生产工业级磷酸脲。研究了磷酸浓度、反应时间、反应温度、磷酸与尿素物质的量比、结晶温度等条件对磷酸脲的氮、磷收率以及产品质量的影响。通过实验得到最佳工艺条件：磷酸中五氧化二磷质量分数为58%、反应时间为35 min、反应温度为80 ℃、尿素和磷酸物质的量比为1∶1、结晶温度为20 ℃。在最佳工艺条件下，产品磷酸脲中五氧化二磷质量分数为44.8%、氮质量分数为17.6%、纯度为99.7%，产品质量达到GB/T 27805—2011《工业磷酸脲》的要求；磷收率为85.7%，氮收率为86.0%。

Study on technology of producing urea phosphate by thermal process phosphoric acid

Industrial urea phosphate was produced by using thermal process phosphoric acid and urea as raw materials.The effect of phosphoric acid concentration，reaction time，reaction temperature，amount of substance ratio of phosphoric acid to urea and crystallization temperature on the yield of nitrogen and phosphorus in urea phosphate and product quality were studied.The optimum technological conditions were obtained as follows：the mass fraction of P2O5 in phosphoric acid was 58%，the reaction time was 35 min，the reaction temperature was 80 ℃，the amount of substance ratio of phosphoric acid to urea was 1∶1 and the crystallization temperature was 20 ℃.Under the optimum technological conditions，the mass fractions of P2O5 and N in urea phosphate were 44.8% and 17.6% and the purity was 99.7%.the product quality met the requirement of the national standard Urea Phosphate for Industrial Use，GB/T 27805—2011.The yields of phosphorus and nitrogen were 85.7% and 86.0%，respectively.