DMSO、DMF和H_2O体系相平衡数据的测定和预测  

Measurement and prediction of vapor-liquid equilibria for systems containing dimethyl sulfoxide,N,N-dimethylformamide and water

作　　者：李果[1] 沈冲[1] 孟洪[1] 李春喜[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《化工学报》2010年第11期2776-2782,共7页CIESC Journal

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%时DMSO-DMF-H2O三元体系的常压汽液平衡数据。结果表明,少量DMF的加入对DMSO-H2O体系的汽液平衡影响较小,基本不影响DMSO-H2O的精馏分离效果,因此DMF有望作为一种良好的稳定剂用于DMSO-H2O精馏分离。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.

关 键 词：二甲基亚砜 N N-二甲基甲酰胺 汽液相平衡 NRTL模型 

分 类 号：TQ013.1[化学工程]