A sustainable approach for the production of high-purity potash fertilizers devoid of chloride is highly needed. Conventional preparation processes for chloride-free potash fertilizers have certain limitations, such as complicated synthesis procedure, including high-temperature requirement, causing environmental pollution. In this work, a novel approach has been proposed for the production of high-purity potash fertilizer (KNO3, K2SO4, and KH2PO4) from KCl by metathesis electrodialysis (MED). Sulfonated poly(ether sulfone)-based cation-exchange membrane and quaternized brominated poly(2,6-dimethyl-1,4-phenylene oxide)-based anion-exchange membranes are used for the MED experiments. The membranes show adequate water uptake, ionic conductivity, and ion-exchange capacity with good mechanical and thermal stabilities. The yields of KNO3, K2SO4, and KH2PO4 are found to be 90, 86, and 90%, respectively. The power consumptions during MED experiment for KNO3, K2SO4, and KH2PO4 are calculated to 0.94, 0.89, and 1.04 kWh/kg, respectively. The purity of products is confirmed by inductively coupled plasma and X-ray diffraction analysis and by measuring ionic contents. The process provides an energy-intensiveway for high-purity synthesis of KNO3, K2SO4, and KH2PO4.
展开▼
机译：迫切需要一种可持续的生产无氯高纯度钾肥的方法。不含氯的钾肥的常规制备方法有一定的局限性，例如合成过程复杂，包括高温要求，造成环境污染。在这项工作中，提出了一种通过复分解电渗析（MED）从氯化钾生产高纯度钾肥（KNO3，K2SO4和KH2PO4）的新方法。 MED实验使用磺化的聚（醚砜）基阳离子交换膜和季铵化的溴化聚（2,6-二甲基-1,4-苯撑氧）基阴离子交换膜。膜表现出足够的吸水率，离子电导率和离子交换能力，并具有良好的机械和热稳定性。发现KNO3，K2SO4和KH2PO4的产率分别为90％，86％和90％。在MED实验中，KNO3，K2SO4和KH2PO4的功耗分别计算为0.94、0.89和1.04 kWh / kg。通过电感耦合等离子体和X射线衍射分析以及通过测量离子含量来确认产品的纯度。该过程消耗大量能源KNO3，K 2 SO 4 和KH 2 PO 4 的高纯度合成方法。
展开▼
