含水和界面活性剂2-异丙氧基乙醇的混合物的液液平衡

测定了可用作界面活性剂的2-异丙氧基乙醇、癸烷和水在25℃时的液液相平衡数据,并用热力学模型ExtendedUNIQUAC模型推算了这些实验数据,Extended UNIQUAC模型成功地描述了2-异丙氧基乙醇、癸烷和水的液液三相平衡,准确地推算2-异丙氧基乙醇、癸烷和水混合液的热力学性质,实验结果和计算结果的均方根误差为1.01.     

水-醋酸-醋酸正丁酯三元体系液液平衡研究

文章用液液平衡装置在常压下,测定了水．醋酸-醋酸正丁酯三元体系40℃的液液相平衡数据。运用Othmer-Tobias方法对系线组成进行关联。由实验数据回归确定了NRTL、UNIQUAC以及修正的UNIFAC活度系数模型参数,并运用这些模型对体系相平衡进行了预测。将实验数据与关联结果比较,结果表明,三种方程均能较好地对溶液组成进行预测,其中UNIQUAC方程的拟合精度最好。     

含甲基叔丁基醚的四元体系液液相平衡

为了考察甲基叔丁基醚对汽油主要成分烃类化合物与水相互溶解性的影响,在298.15 K和常压下,测定了2个四元体系水-甲基叔丁基醚-异辛烷-异丙醇和水-甲基叔丁基醚-异辛烷-甲苯的液液相平衡数据,并用含有二元、三元和四元相互作用参数的Extended UNIQUAC模型和Modified UNIQUAC模型对液液相平衡数据进行了关联计算。结果表明:在298.15 K时测得的四元体系液液相平衡数据和模型的计算结果很吻合,Extended UNIQUAC和Modified UNIQUAC模型成功地描述了四元混合液的液液相平衡,这些基础数据对化工生产过程的设计和分离操作条件的选择都是非常有意义的。     

乙腈－1-丙醇－3-甲基丁醇体系的等压汽液平衡的研究

用改进的Rose釜测定了在101.3 kPa下乙腈-1-丙醇、乙腈-3-甲基丁醇、1-丙醇-3-甲基丁醇、乙腈-1-丙醇-3-甲基丁醇体系的等压汽液平衡数据,并通过了热力学一致性检验。用Wilson、NRTL模型对三个二元体系的汽液相平衡数据进行关联,效果良好。由关联得到的三个二元体系的Wilson、NRTL模型参数预测部分三元体系的气液平衡数据,乙腈、1-丙醇及3-甲基丁醇汽相组成的平均绝对偏差分别小于0.0055、0.0044、0.0052,温度的平均绝对偏差小于1.00 K。研究结果为加入3-甲基丁醇的萃取精馏分离乙腈和1-丙醇混合物提供了重要的基础数据。     

醋酸甲酯-甲醇-水三元物系液液平衡数据的测定与关联

测定了常压下20、30、40、50℃时醋酸甲酯 水二元体系及醋酸甲酯 甲醇 水三元体系的液液平衡(LLE)数据,并与文献中已有的醋酸甲酯 水的液液平衡数据进行比较,证明了测定方法的可靠性。采用二元与三元液液平衡数据相结合的关联方法,并用NRTL和UNIQUAC模型对所测数据进行了热力学关联,得出了相应的模型参数。用该模型对三元体系进行计算,结果令人满意。用VisualBasic6.0语言开发了液液相平衡关联软件,可方便地用于二元和三元液液相平衡的计算。     

醋酸异丙酯-醋酸-水体系汽液相平衡研究

用改进的Rose釜测定了101.33 kPa下醋酸异丙酯-醋酸、醋酸异丙酯-醋酸-水(互溶区内)的等压汽液相平衡数据.考虑了醋酸在汽相中的缔合效应和非理想性,用NRTL、UNIQUAC模型对醋酸异丙酯-醋酸体系汽液相平衡数据进行关联,得到了相应的模型参数.在三元汽液相平衡数据的预测过程中详细讨论了醋酸-水体系汽液平衡数据对预测结果的影响,获得了较优的预测结果.     

1-甲基萘-正癸烷-1-十四烯-环丁砜体系液液相平衡数据测定及关联

采用溶剂萃取分离催化裂化柴油中的芳烃是催化裂化柴油改质一条有效的途径。测定了常压下323.15、333.15和343.15 K时1-甲基萘-正癸烷-1-十四烯-环丁砜体系的液液相平衡数据,得到该体系的三元相图,1-甲基萘对非芳烃的选择性系数保持在2~55之间,说明环丁砜溶剂萃取分离1-甲基萘是可行的。采用Hand方程和Othmer-Tobias方程对相平衡数据进行关联,相关性系数均大于0.99,表明相平衡数据具有较好的一致性。利用NRTL方程进行关联,获得二元交互作用参数,NRTL模型计算值与实验值的均方根偏差很小,说明NRTL模型适合该体系的液液相平衡。     

水-二甲基甲酰胺-甲酸体系汽液相平衡的研究

用改进的Rose釜测定了水-N,N-二甲基甲酰胺（DMF）在101.33kPa、13.33kPa下的二元及水──DMF──甲酸在101.33kPa下的三元等压汽液相平衡数据．并对水──DMF汽液相平衡数据进行了关联,得出了相应的UNIQUAC,NRTL和Wilson模型参数．用Wilson模型推算了所测的三元汽液相平衡实验数据．结果令人满意．     

乙酸乙酯-间苯二酚-酸性盐水液液相平衡测定及关联

乙酸乙酯作为萃取剂在酸性盐水环境下萃取间苯二酚。平衡法测定了40℃、101.33 kPa时乙酸乙酯-间苯二酚-酸性盐水准三元体系的液液相平衡数据,实验结果表明间苯二酚的存在增加了乙酸乙酯和水的相互溶解度,降低了萃取效率;盐的存在则降低了乙酸乙酯在水中的溶解度,有利于间苯二酚的萃取。用NRTL模型对实验数据进行了关联,得到了乙酸乙酯-间苯二酚-酸性盐水体系的液液相平衡模型参数,关联结果与实验数据基本吻合。测定的液液相平衡数据可为间苯二酚萃取过程以及间苯二胺水解联产间苯二酚和间氨基苯酚的生产装置的工艺设计提供依据。     

1-甲基萘-正癸烷-1-十四烯-环丁砜体系液液相平衡数据测定及关联

采用溶剂萃取分离催化裂化柴油中的芳烃是催化裂化柴油改质一条有效的途径。测定了常压下323.15、333.15和343.15 K时1-甲基萘-正癸烷-1-十四烯-环丁砜体系的液液相平衡数据,得到该体系的三元相图,1-甲基萘对非芳烃的选择性系数保持在2～55之间,说明环丁砜溶剂萃取分离1-甲基萘是可行的。采用Hand方程和Othmer-Tobias方程对相平衡数据进行关联,相关性系数均大于0.99,表明相平衡数据具有较好的一致性。利用NRTL方程进行关联,获得二元交互作用参数,NRTL模型计算值与实验值的均方根偏差很小,说明NRTL模型适合该体系的液液相平衡。     

1-乙氧基-2-丙醇/水/癸烷的液液平衡

引　言石油是目前最重要的能源 ,除了液体石油外 ,油砂和油岩也能作为石油资源 .油岩分散存在于砂岩层中 ,只能通过物理的方法开采 ,乳化是可利用的提取方式之一 .为了了解乳化的原理及其体系的变化动态 ,作者曾经考察了 2 乙氧基乙醇、癸烷和水的液液三相平衡[1] .作为系统研     

Investigation of liquid–liquid equilibrium of the ternary system(water +1,6-diaminohexane + 2-methyl-1-propanol or 3-methyl-1-butanol) at different temperatures

In this study, the LLE data of ternary system (water+1,6-diaminohexane+2-methyl-1-propanol) and (water+1,6-diaminohexane+3-methyl-1-butanol) were measured at 293.15, 303.15 and 313.15 K under atmospheric pressure. Reliability of the experimental tie-line data was checked by empirical Hand, Othmer-Tobias and Bachman equations. Distribution coefficient (D) and selectivity (S) were calculated in order to investigate capability of the studied organic solvents for 1,6-diaminohexane extraction. The high values of separation factors demonstrated that 2-methyl-1-propanol and 3-methyl-1-butanol were applicable for this purpose. The experimental data were correlated by nonrandom two-liquid (NRTL) and universal quasi-chemical (UNIQUAC) models. The percent-root-mean-square deviation (RMSD) values for NRTL and UNIQUAC models were less than 0.15, which indicated that the experimental data have been sufficiently correlated.     

Measurements and thermodynamic modeling of liquid–liquid equilibria in ternary system 2-methoxy-2-methylpropane+p-cresol+water

Liquid–liquid equilibrium(LLE)data for the ternary system 2-methoxy-2-methylpropane(methyl tert-butyl ether)+ p-cresol + water was measured at atmospheric pressure and temperatures of 298.15 K and 313.15 K.From the distribution coefficients and selectivity,it was found that 2-methoxy-2-methylpropane is an efficient solvent to extract p-cresol from wastewater.The consistency of the experimental tie-line data was verified with the Hand and Bachman equations.These data were also correlated with the non-random two liquid(NRTL)and universal quasi-chemical correlation activity coefficient(UNIQUAC)models to yield binary interaction parameters for p-cresol extraction process evaluation.Both models agreed with experiments very well,yet the NRTL model showed even smaller average deviation than the UNIQUAC model.     

水-丙烯酸-醋酸-甲苯四元体系液液平衡数据的测定与关联

采用液液平衡釜,在常压下,测定了293.15,303.15,313.15 K时水-丙烯酸-醋酸-甲苯四元体系的液液平衡数据,为萃取-非均相共沸精馏法精制丙烯酸选择适宜的溶剂提供依据.使用Othmer-Tobias方程对实验数据进行线性拟合.分别采用非随机双液(NRTL)和通用似化学(UNlQUAC)活度系数模型对实验体...     

Isobaric Vapor-Liquid-Liquid Equilibria for 1-Butanol + Water + 2,3-Butanediol at 101.3 kPa

Vapor-liquid-liquid equilibria (VLLE) data were determined for the ternary system 1-butanol + water + 2,3-butanediol at 101.3 kPa. A binary heterogeneous minimum boiling azeotrope was found at 365.95 K with mass fractions of 0.526 and 0.474 for 1-butanol and water, respectively. A modified UNIQUAC model was used to predict VLLE by using experimental data, including VLE of 1-butanol + 2,3-butanediol, VLE of water + 2,3-butanediol, LLE of 1-butanol + water, and one LLE tie-line of 1-butanol + water + 2,3-butanediol. The experimental data were compared with the calculated values. The absolute average relative deviations (AARD) are 1.65%, 1.72%, and 2.22% for organic liquid phase, aqueous liquid phase, and vapor phase, respectively. It demonstrates an appropriate fit of the modified UNIQUAC model.     

水-甲基叔丁基醚-二异丙醚三元体系液液相平衡的研究

在常压下测定了不同温度时水-甲基叔丁基醚-二异丙醚三元体系的液液平衡,并用Modified UNIQUAC模型和Extended UNIQUAC模型对所测体系进行了关联计算．Modified UNIQUAC模型的计算结果与实验数据的关联性更好。     

Liquid-liquid equilibria for water+2,3-butanediol+1-pentanol ternary system at different temperatures of 298.2, 308.2, and 318.2 K

Liquid-liquid equilibrium (LLE) data was measured for the water+2,3-butanediol+1-pentanol ternary system at 298.2, 308.2, and 318.2 K under atmospheric pressure. Binodal solubility curves and complete ternary phase diagrams were experimentally obtained in mass fraction at these three different temperatures. The consistency of the tieline results was verified by using Othmer-Tobias and Hand plots. Distribution coefficients and separation factors of 2,3- butanediol were evaluated for each tie-line, and the effect of temperature was also investigated. It was found that the distribution coefficients and separation factors of 2,3-butanediol increased with temperature. The experimental LLE data were correlated by the UNIQUAC and NRTL models, and the binary interaction parameters calculated from these models have been reported. Both models successfully predict the experimental tie-line data within average root-mean-square deviations (RMSD) being less than 1.38% and 1.49% from the UNIQUAC and NRTL models, respectively.     

Measurement and correlation of phase equilibrium data of the mixtures consisting of water,resorcinol, mesityl oxide at different temperatures

Liquid-liquid equilibrium (LLE) data were measured for the ternary system of water+resorcinol+mesityl oxide under atmospheric pressure at temperatures of (298.2, 323.2, 333.2, 343.2 and 353.2) K. The reliability of the experimental data was verified by the Hand and Bachman equations. The distribution coefficient and selectivity were calculated from the experimental LLE data, which showed high efficiency of mesityl oxide extracting resorcinol from the aqueous solution. The NRTL and UNIQUAC models were employed to fit the measured experimental LLE data and yield corresponding binary interaction parameters.     

Tie-line data for aqueous mixtures of butyric acid with isobutyl acetate at various temperatures

Experimental liquid-liquid equilibrium (LLE) data for the system of (water+butyric acid+iso-butyl acetate) were obtained at T=(298.2, 303.2, 308.2, and 313.2) K and atmospheric pressure. This ternary system exhibits type-1 behavior of LLE. The experimental tie-line data were correlated using the UNIQUAC and NRTL models. The reliability of the experimental tie-line data was determined by applying the Othmer-Tobias and Hand correlations. Distribution coefficients and separation factors were calculated over the immiscibility regions.