溶剂加盐对分离非极性体系的影响

以C4为例利用无限稀释相对挥发度的试验测定结果 ,研究加盐萃取精馏分离非极性体系的影响规律。试验研究表明 ,溶剂加盐能够提高C4组份之间的相对挥发度 ,且比一般有机溶剂效果明显 ;盐浓度较低时随着盐浓度的提高 ,C4组份之间的相对挥发度增加 ;盐浓度较高时 ,随着盐浓度的提高 ,C4组份之间的相对挥发度反而降低 ;温度升高 ,加盐溶剂对C4组份之间的相对挥发度降低。并对试验现象作了理论上的解释。

Influence of Addition ofSalt to Solvent on Separating Non-Polar Systems by Extractive Distillation

The influence on separating non polar systems of C 4 fractions by extractive distillation with addition of salt in terms of relative volatility at infinite dilution was studied.The results showed that solvents with addition of salt could improve the relative volatility of C 4 more apparently than other organic solvents added to the basic solvent.As salt concentration which was low in the solution rose,the relative volatility of C 4 would go up.On the contrary,the relative volatility of C 4 would go down with the rising of salt concentration which was originally high in the solution.It was also found that the relative volatility varies reversely with the change in temperature.An interpretation of the phenomena is given in the paper. [