Xu Shichang, Zhang Zhen, Zhang Long, Xie Lixin, Zhang Wen
State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
Membranes (Basel). 2025 May 1;15(5):136. doi: 10.3390/membranes15050136.
Potassium phosphate (KPO) is a common inorganic compound with broad applications in agriculture and industry. Although the traditional thermal method of preparing KPO by reacting phosphoric acid with potassium hydroxide can obtain high-quality products, it consumes a lot of energy and has high costs. This study explores the process of preparing KPO by Electrodialysis metathesis (EDM). This process uses sodium phosphate (NaPO) and potassium chloride (KCl) as raw materials and can prepare KPO continuously. Under the optimized conditions (operating voltage of 8 V, 0.35 mol/L NaPO and 1.05 mol/L KCl in raw flow with the rate of 30 mL/min), the product purity of KPO reaches more than 97%, the energy consumption is 1191 kW·h/t, and the cost is about 8314 CNY/ton. Compared with traditional methods, EDM has the advantages of low cost, simple operation, and high utilization rate. This study shows that EDM technology has significant potential in preparing KPO.
磷酸钾（KPO）是一种常见的无机化合物，在农业和工业中有广泛应用。尽管传统的通过磷酸与氢氧化钾反应制备KPO的热法能够获得高质量的产品，但它消耗大量能源且成本高昂。本研究探索了通过电渗析复分解法（EDM）制备KPO的过程。该过程使用磷酸钠（NaPO）和氯化钾（KCl）作为原料，能够连续制备KPO。在优化条件下（操作电压8V，原料流中0.35mol/L的NaPO和1.05mol/L的KCl，流速30mL/min），KPO产品纯度达到97%以上，能耗为1191kW·h/t，成本约为8314元/吨。与传统方法相比，EDM具有成本低、操作简单和利用率高的优点。本研究表明，EDM技术在制备KPO方面具有巨大潜力。
