摘要
含盐体系的精馏和萃取取精馏由于效率高、耗能低等特点,受到人们的普遍关注.含盐体系汽液相平衡的研究色受到了相应的重视.不同研究学者对食盐体系VLE数据的关联及预测提出了不同的方法.这些方法是以含盐三元VLE数据为基础的关联方法.与上述方法不同的另一种预测方法,是以含盐饱和蒸汽压数据为基础,作为二元VLE数据,仿照一般非盐体系VLE数据的处理方法,根据液相活度系数模型可由二元数据预测多元数据的特点,来预测含盐体系多元VLE数据.Glugla等用UNIQUAC模型对一价盐体系做了研究.而其它模型对一价、二价盐及有机盐的饱和蒸汽压关联精度如何,以及在关联、预测中精度是否有差别,均需要进一步探讨.
By treating salt as one kind of solvent, eighteen sets of vapor pressure data of salt-containing systems have been correlated with Wilson, NRTL and modified UNIQUAC models. The maximum likelihood method based on maximum liklihood principle was used in correlation. Satisfactory results were obtained for all the three models. The optimum parameters thus obtained were used to predict five sets of VLE data for multicomponent salt-containing systems reported in literature. The predicted results show that the precision with NRTL model is a little better than with the other models; and is comparable with 'pseudo binary approach'.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1991年第5期642-646,共5页
CIESC Journal
