湿法磷酸制备水溶性聚磷酸铵工艺研究及产业化  

Research on the preparation process of water-soluble APP from WPA and its industrialization

作　　者：陈富全 CHEN Fuquan(Yunnan Tianan Chemical Co.,Ltd.,Kunming 650300,China)

机构地区：[1]云南天安化工有限公司,云南昆明650300

出　　处：《生态产业科学与磷氟工程》2024年第11期45-49,共5页Eco-industry Science & Phosphorus Fluorine Engineering

摘　　要：水溶性聚磷酸铵(APP)是一种含有氮、磷营养元素的新型肥料,具有养分含量高、溶解性好、与金属离子螯合性能好等优点,能够提高土壤中的有效磷含量,从而提高磷的有效利用率。采用湿法磷酸、尿素、氨为主要原料制备聚磷酸铵,针对中和工序的中和度,聚合工序的原料配比、反应温度和反应时间等工艺参数进行了研究。较优工艺条件为:磷酸一铵(MAP)料浆中和度为0.8,m(MAP料浆)∶m(尿素)=5∶1,反应时间为4 h,反应温度为200℃。此条件下所得水溶性聚磷酸铵产品w(P2O5)为55.19%,w(N)达到17.07%,平均聚合度2.04,溶解度为112.4 g。产业化结果表明,与以工业磷酸一铵为原料相比,该工艺生产的水溶性聚磷酸铵成本可降低20%左右。该工艺稳定、成本较低,具有广阔的应用前景。Water-soluble ammonium polyphosphate(APP)is a new type of fertilizer containing nitrogen and phosphorus nutrients.It has the advantages of high nutrient content,good solubility and good chelation performance with metal ions,which can increase the content of available phosphorus in soil and thus improve the effective utilization rate of phosphorus.Ammonium polyphosphate is prepared with WPA,urea and ammonia as the main raw materials.The neutralization degree of the neutralization process,the raw material ratio,reaction temperature,and reaction time of the polymerization process were studied.The optimal process conditions are as follows:The neutralization degree of MAP slurry is 0.8,the mass ratio of MAP slurry and urea is 5∶1,reaction time is 4 hours,and reaction temperature is 200℃.Under these conditions,the water-soluble ammonium polyphosphate product obtained has a phosphorus pentoxide content of 55.19%,a nitrogen content of 17.07%,an average polymerization degree of 2.04,and a solubility of 112.4 g.Industrialization research shows that compared to using industrial ammonium phosphate as raw material,the cost of water-soluble ammonium polyphosphate produced by this process can be reduced by about 20%.This process is stable,cost-effective,and has broad application prospects.

关 键 词：湿法磷酸 水溶性聚磷酸铵 工艺 聚合反应 

分 类 号：TQ126.35[化学工程—无机化工]