阐明萃取精馏溶剂加盐如何提高相对挥发度。根据定标粒子理论基本方程的建立过程 ,导出了萃取精馏分离过程盐效应常数与加盐前后无限稀释相对挥发度之间的关系。对分离非极性体系根据定标粒子理论的求解方法计算出盐效应常数 ks,进而求得加盐后无限稀释相对挥发度 ,并与实验值对比吻合良好。对分离极性体系定性比较被分离组分 ks的大小。所得结论与实际情况吻合 ,将有助于加盐萃取精馏的理论研究 Clarify how extractive distillation solvent salt can increase relative volatility. According to the process of establishing the basic equation of the calibrated particle theory, the relationship between the salt effect constant of extractive distillation and the relative volatility of infinite dilution before and after salt extraction was derived. The separation of non-polar system based on the calibration particle theory solution method to calculate the salt effect constant ks, and then obtain the infinite dilution of salt after adding relative volatility, and good agreement with the experimental value. Qualitative separation of the polar system to compare the size of the fraction ks. The conclusion is consistent with the actual situation, which will be helpful for the theoretical study of extractive distillation with salt