分段煅烧法制备食品级三偏磷酸钠试验研究

Study on preparation of food grade sodium trimetaphosophate by multi-step calcination

以无水NaH_2PO_4为原料,通过分段煅烧制备出了高纯度食品级Na_3(PO_3)_3。通过设计在不同条件下的分段煅烧试验,确定了较优煅烧方法,并对其反应机理进行了分析。试验表明,以无水NaH_2PO_4为原料,采用较优煅烧方法可以制得高纯度食品级产品,产品中三偏磷酸钠的含量可达99.5%以上。

High purty food grade sodium trimetaphosophate was prepared by multi-step calcination from anhydrous sodium dihydrogen phosphate. The optimal calcination method was determined by multi-step calcination experiment in different conditions,and the reaction mechanism of calcination was analyzed.It was found that high purty food grade products can be prepared from sodium dihydrogen phosphate by the optimal calcination method, the content of sodium trimetaphosphate in products can reach more than 99.5%.