在101.32 k Pa下,用改进的Othmer釜测定了含离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐([emim]OTf)的乙酸乙酯-乙腈物系的等压汽液平衡数据;采用NRTL方程对实验数据进行关联,关联效果良好。实验结果表明,加入[emim]OTf后,乙酸乙酯-乙腈二...在101.32 k Pa下,用改进的Othmer釜测定了含离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐([emim]OTf)的乙酸乙酯-乙腈物系的等压汽液平衡数据;采用NRTL方程对实验数据进行关联,关联效果良好。实验结果表明,加入[emim]OTf后,乙酸乙酯-乙腈二组分物系汽液平衡线发生偏离,[emim]OTf含量越高,偏离程度越大;[emim]OTf具有明显的盐析效应,当[emim]·OTf的含量达到5%(x)时,就可消除乙酸乙酯-乙腈物系的共沸点;[emim]OTf可作为乙酸乙酯-乙腈萃取精馏的萃取剂。展开更多
在101.3 k Pa下,采用改进的Othmer釜测定了甲醇+碳酸二甲酯(DMC)+二乙二醇三元物系的等压汽液平衡数据。实验结果表明,二乙二醇萃取剂的加入,降低了甲醇对DMC的相对挥发度,提高了物系的平衡温度。二乙二醇不适合作为萃取精馏分离甲醇+DM...在101.3 k Pa下,采用改进的Othmer釜测定了甲醇+碳酸二甲酯(DMC)+二乙二醇三元物系的等压汽液平衡数据。实验结果表明,二乙二醇萃取剂的加入,降低了甲醇对DMC的相对挥发度,提高了物系的平衡温度。二乙二醇不适合作为萃取精馏分离甲醇+DMC物系的萃取剂。用NRTL模型对DMC+甲醇+二乙二醇三元物系溶剂比为0.25,0.5,1时汽液平衡实验数据进行了关联,温度标准偏差最大为0.63 K。展开更多
在101.3 k Pa下,用改进的Othmer釜测定了乙酸乙酯-乙腈-1-辛基-3-甲基咪唑六氟磷酸盐([OMIM]PF_6)三组分物系的等压汽液相平衡数据,并应用NRTL模型对汽液相平衡的数据进行了关联。实验结果表明,[OMIM]PF_6对乙酸乙酯有明显的盐析效应;...在101.3 k Pa下,用改进的Othmer釜测定了乙酸乙酯-乙腈-1-辛基-3-甲基咪唑六氟磷酸盐([OMIM]PF_6)三组分物系的等压汽液相平衡数据,并应用NRTL模型对汽液相平衡的数据进行了关联。实验结果表明,[OMIM]PF_6对乙酸乙酯有明显的盐析效应;离子液体的加入使乙酸乙酯-乙腈二组分物系的汽液平衡曲线发生偏离,离子液体加入量越大,偏离程度越大;乙酸乙酯-乙腈-[OMIM]PF_6三组分物系乙酸乙酯的汽相摩尔分数的实验值与计算值的绝对平均偏差为0.004,温度平均偏差为0.4 K。展开更多
This paper has studied the vapor-liquid equilibrium （VLE） for the salt-containing extractive distillation of the 1-propanol/water system. Binary VLE data were measured for the systems of 1-propanol （1）/KAc （4）, ...This paper has studied the vapor-liquid equilibrium （VLE） for the salt-containing extractive distillation of the 1-propanol/water system. Binary VLE data were measured for the systems of 1-propanol （1）/KAc （4）, ethanediol （3）/KAc （4）, and 1-propanol （1）/ethanediol （3）, with the VLE data correlated with the NRTL model in order to obtain the model parameters of these binary systems. The binary VLE data cited in technical literature were correlated to obtain the model parameters for other binary systems. VLE data of ternary and quaternary systems predicted by the NRTI.： model agreed well with the literature data. The influence of KAc, ethanediol, and the KAc/ethanediol mixture on volatility between 1-propanol and water was investigated respectively. Test results showed that the above-mentioned materials （KAc, ethanediol） and their mixture （KAc and ethanediol） have different influence on the volatility. When x3=0.5, and x4=0.05, the azeotropic point can be elimi- nated. The NRTL model method of salt-containing VLE is simple and effective for the prediction of the system＇s VLE data.展开更多
文摘通过COSMO-RS模型筛选出1-乙基-3-甲基咪唑三氟乙酸盐([EMIM][TFA])、1-乙基-3-甲基咪唑二氰胺盐([EMIM][DCA])、1-乙基-3-甲基咪唑磷酸二乙酯([EMIM][DEP])三种离子液体作为萃取剂分离正己烷-异丙醇体系。在303.15 K、101.3 kPa下,测定正己烷+异丙醇+[EMIM][DCA]/[EMIM][TFA]/[EMIM][DEP]的三元液液相平衡实验数据,通过计算得出选择性与分配系数,分析离子液体各自的分离性能。通过Othmer-Tobias,Bachman,Hand方程对实验数据进行一致性检验。采用Aspen Plus v11流程模拟软件中NRTL模型进行数据关联拟合,获得均方根偏差(RMSD)和二元交互作用参数。模拟结果表明,选择性与分配系数均大于1,说明三种离子液体均可作为萃取剂;方程的回归系数均大于0.95,说明实验数据可靠;得到RMSD均小于3%,说明模拟计算数据能较好地关联实验数据。
文摘在101.32 k Pa下,用改进的Othmer釜测定了含离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐([emim]OTf)的乙酸乙酯-乙腈物系的等压汽液平衡数据;采用NRTL方程对实验数据进行关联,关联效果良好。实验结果表明,加入[emim]OTf后,乙酸乙酯-乙腈二组分物系汽液平衡线发生偏离,[emim]OTf含量越高,偏离程度越大;[emim]OTf具有明显的盐析效应,当[emim]·OTf的含量达到5%(x)时,就可消除乙酸乙酯-乙腈物系的共沸点;[emim]OTf可作为乙酸乙酯-乙腈萃取精馏的萃取剂。
文摘在101.3 k Pa下,采用改进的Othmer釜测定了甲醇+碳酸二甲酯(DMC)+二乙二醇三元物系的等压汽液平衡数据。实验结果表明,二乙二醇萃取剂的加入,降低了甲醇对DMC的相对挥发度,提高了物系的平衡温度。二乙二醇不适合作为萃取精馏分离甲醇+DMC物系的萃取剂。用NRTL模型对DMC+甲醇+二乙二醇三元物系溶剂比为0.25,0.5,1时汽液平衡实验数据进行了关联,温度标准偏差最大为0.63 K。
文摘在101.3 k Pa下,用改进的Othmer釜测定了乙酸乙酯-乙腈-1-辛基-3-甲基咪唑六氟磷酸盐([OMIM]PF_6)三组分物系的等压汽液相平衡数据,并应用NRTL模型对汽液相平衡的数据进行了关联。实验结果表明,[OMIM]PF_6对乙酸乙酯有明显的盐析效应;离子液体的加入使乙酸乙酯-乙腈二组分物系的汽液平衡曲线发生偏离,离子液体加入量越大,偏离程度越大;乙酸乙酯-乙腈-[OMIM]PF_6三组分物系乙酸乙酯的汽相摩尔分数的实验值与计算值的绝对平均偏差为0.004,温度平均偏差为0.4 K。
文摘This paper has studied the vapor-liquid equilibrium （VLE） for the salt-containing extractive distillation of the 1-propanol/water system. Binary VLE data were measured for the systems of 1-propanol （1）/KAc （4）, ethanediol （3）/KAc （4）, and 1-propanol （1）/ethanediol （3）, with the VLE data correlated with the NRTL model in order to obtain the model parameters of these binary systems. The binary VLE data cited in technical literature were correlated to obtain the model parameters for other binary systems. VLE data of ternary and quaternary systems predicted by the NRTI.： model agreed well with the literature data. The influence of KAc, ethanediol, and the KAc/ethanediol mixture on volatility between 1-propanol and water was investigated respectively. Test results showed that the above-mentioned materials （KAc, ethanediol） and their mixture （KAc and ethanediol） have different influence on the volatility. When x3=0.5, and x4=0.05, the azeotropic point can be elimi- nated. The NRTL model method of salt-containing VLE is simple and effective for the prediction of the system＇s VLE data.
