Abstract:

Vapor pressure data of binary and ternary systems of dimethyl sulfoxide (DMSO)-N,N-dimethylformamide (DMF), DMSO-H₂O, and DMSO-DMF-H₂O were measured at various temperature and concentrations by using a quasi-static ebulliometer method. The experimental data of the binary systems were correlated by NRTL model, and the resulting binary parameters were used to predict the vapor pressure data for the ternary system with good accuracy. Furthermore, the isobaric vapor-liquid equilibrium (VLE)of DMSO-DMF-H₂O systems was predicted by NRTL model. It is showed that with the addition of small amount of DMF the shift of VLE curve is insignificant, implying its negligible effect on the distillation separation of DMSO-H₂O mixture. Hence, DMF may be utilized as a stabilizer in the distillation separation process of DMSO-H₂O system.

摘要：

采用拟静态沸点仪法 测定了二元体系二甲基亚砜（DMSO）-N,N-二甲基甲酰胺（DMF）、DMSO-H₂O和三元体系DMSO-DMF-H₂O在不同组成时的饱和蒸气压数据。用NRTL模型对二元数据进行了关联，用关联得到的二元模型参数计算了三元体系的饱和蒸气压数据，理论计算与实验值符合良好。利用NRTL模型预测了DMF占DMSO质量分数分别为1%、5%、10%