Wet Process Phosphoric Acid Purification Using Functionalized Organic Nanofiltration Membrane

The utilization of phosphoric acid in various sectors, e.g., food industry, is controlled by the authorized concentration limit impurities. However, industrial contaminated with undesirable impurities (such as F, Al, Fe, Mg, etc.). Herein, this study aimed to evaluate efficiency membrane purification process pretreated using a premodified nanofiltration membrane. We demonstrated that prior pretreatment steps for allowed elimination sulfate, fluorine and arsenic. Further obtained cells reduced concentrations Cd, Fe rare earth elements 94.81, 99.30, 99.63 96.67%, respectively. functionalized deposit high molecular weight polycationic polymer polyethyleneimines order produce highly charged surface enhance separation efficiency, selectivity stability found relies on electrostatic repulsion between ions, reduction rate metals cation charge-dependent parameter. laboratory pilot scale results showed allows production food-grade acid.