氯化锂、氯化钠在NMP中溶解度的测定与关联

Determination and correlation of solubilities of lithium chloride and sodium chloride in NMP

为了回收聚苯硫醚生产中的助剂氯化锂,对氯化锂、氯化钠在溶剂NMP（N-甲基吡咯烷酮）中的溶解性能进行了研究。利用激光衍射辅助法在297.95～364.75 K温度范围内对氯化锂、氯化钠在NMP中的溶解度进行了测定,并用经验方程、λh方程、改进的NRTL方程对氯化锂在NMP中的溶解度数据进行关联。结果证明,改进的NRTL方程的拟合结果最好,平均相对偏差仅为0.41%,可适用于较高温度下氯化锂-NMP体系溶解度的数据估计。

In order to recover the additive lithium chloride in the polyphenylene sulfide production, the disolution of lithium chloride and sodium chloride in solvent N-methyl pyrrolidone （NMP） was studied. By using laser diffraction assistance method, solubility data of lithium chloride and sodium chloride in NMP were measured between 297.95 K and 364.75 K. Empirical formula, λh equation and improved NRTL equation were used to correlate the solubility data of lithium chloride in NME The results show that the solubility of lithium chloride increases with temperature while that of sodium chloride almost keeps unchanged. The improved NRTL equation can predict the solubility data well and the relative average error is 0.41%. Thus the K-NRTL equation is most suitable for description of solid-liquid equilibrium of lithium chloride in NMP at high temperature.