Electrodialysis Metathesis for the Production of Potassium Phosphate
Potassium phosphate (K<sub>3</sub>PO<sub>4</sub>) is a common inorganic compound with broad applications in agriculture and industry. Although the traditional thermal method of preparing K<sub>3</sub>PO<sub>4</sub> by reacting phosphoric acid with pota...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
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| Series: | Membranes |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-0375/15/5/136 |
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| Summary: | Potassium phosphate (K<sub>3</sub>PO<sub>4</sub>) is a common inorganic compound with broad applications in agriculture and industry. Although the traditional thermal method of preparing K<sub>3</sub>PO<sub>4</sub> 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 K<sub>3</sub>PO<sub>4</sub> by Electrodialysis metathesis (EDM). This process uses sodium phosphate (Na<sub>3</sub>PO<sub>4</sub>) and potassium chloride (KCl) as raw materials and can prepare K<sub>3</sub>PO<sub>4</sub> continuously. Under the optimized conditions (operating voltage of 8 V, 0.35 mol/L Na<sub>3</sub>PO<sub>4</sub> and 1.05 mol/L KCl in raw flow with the rate of 30 mL/min), the product purity of K<sub>3</sub>PO<sub>4</sub> 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 K<sub>3</sub>PO<sub>4</sub>. |
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| ISSN: | 2077-0375 |