水-丙烯酸-甲基异丁基甲酮体系液液平衡数据的测定与关联

为萃取-共沸精馏法分离丙烯酸水溶液选择适宜的溶剂,采用液液平衡釜,在常压下测定了293.15,303.15,313.15 K下水-丙烯酸-甲基异丁基甲酮三元体系的液液平衡数据.使用Hand方程对实验数据进行拟合,相关性系数的平方均大于0.99.利用Aspen Plus过程模拟软件的数据回归系统,分别采用非随机双液(NR...     

丙烯酸-水-邻苯二甲酸二乙酯三元体系的液液相平衡

为考察邻苯二甲酸二乙酯在常压、不同温度(303.15、313.15、323.15 K)下对水溶液中丙烯酸的萃取效果,采用平衡釜法测量丙烯酸-水-邻苯二甲酸二乙酯三元体系的液液相平衡数据。数据结果表明：邻苯二甲酸二乙酯对丙烯酸具有较高的分配系数和选择性;使用Othmer-Tobias和Hand方程计算的线性相关性R²大于0.999,表明实验数据具有很好的热力学一致性,验证了实验测定数据的可靠性;拟合的UNIQUAC模型二元交互参数能很好地关联三元体系的实验数据,同时利用基于COSMO理论的电荷密度分布对萃取机理进行了解释。     

丙烯酸正丁酯-正丁醇-水体系汽-液、液-液相平衡研究

测定了丙烯酸正丁酯-水、正丁醇-水二元系在常压下的液-液平衡数据及200×1.333×10~2Pa下的丙烯酸正丁酯-正丁醇二元系和丙烯酸正丁酯-正丁醇-水三元系的汽-液平衡数据。由测定的三对二元数据求取了NRTL常数,并与三元实验数据进行拟合,计算值与实验值符合良好,从而使液-液平衡与汽-液平衡得到了统一的关联。     

水-醋酸-二异丙醚三元体系液液相平衡数据的测定

实验测定了水-醋酸-二异丙醚三元体系在293.15 K、303.15 K的液液相平衡数据.分别采用Othmer-Tobias和Bachman方程对实验数据进行了可靠性检验,相关性系数均大于0.983.绘制了三元液液平衡相图.     

常压下叔丁醇-水-乙二醇体系汽液平衡测定与关联

在常压(101.3 kPa)下,采用改进的Othmer汽液平衡釜测定了叔丁醇-乙二醇体系的汽液平衡数据,对所测得的数据进行热力学一致性检验,结果表明实验数据符合热力学一致性。用NRTL模型对叔丁醇-乙二醇体系的汽液平衡数据进行关联,得到二元交互作用参数,并用这些参数计算汽相组成及平衡温度,计算结果与实验数据吻合。测定了叔丁醇-水-乙二醇三元体系的汽液平衡数据,乙二醇存在下,叔丁醇-水体系的相对挥发度大幅提高,证明乙二醇是萃取精馏分离叔丁醇-水体系的优良溶剂。     

含辛烯醛体系的液液、汽液相平衡研究

测定了水-辛烯醛、水-正丁醇二元系在常压下的液液平衡数据及26.66kPa下的正丁醇-辛烯醛二元系和水-正丁醇-辛烯醛三元系的汽液平衡数据.由测定的3对二元数据求取了NRTL常数及有规参数,并与三元数据进行拟合,计算值与实验值符台良好,液液平衡与汽液平衡得到了统一的关联.     

甲苯-正己烯-二甲基亚砜液-液平衡数据的测定与关联

裂解汽油是含有烯烃的重要芳烃资源,二甲基亚砜(DMSO)能够从高烯烃含量组分中选择性萃取芳烃,测定相应体系液-液平衡是裂解汽油中的芳烃萃取过程研究开发的理论基础。测定了常压下293.15、298.15、303.15 K时甲苯-正己烯-DMSO体系液-液平衡数据,获得了三元体系的相图和褶点,并采用Hand方程和NRTL方程进行关联。体系中甲苯对正己烯选择性系数为2～6,表明DMSO萃取分离甲苯和正己烯理论上可行。通过体系液-液平衡关联获得了NRTL方程模型参数,利用NRTL模型对该体系进行计算,计算值与实验值的平均偏差较小,说明NRTL模型适用于该体系的液-液平衡。     

环己烷-正庚烷-N,N-二甲基甲酰胺体系液液相平衡测定与关联

采用平衡釜法测定了三元体系(环己烷+正庚烷+N,N-二甲基甲酰胺)在常压不同温度(30,40,50℃)下的液液相平衡数据。实验数据用Bachaman及Othmer-Tobias进行可靠性关联,关联结果表明数据的可靠性较好,根据实验结果绘制了三元相图。对不同温度下的液液平衡实验数据,分别用NRTL和UNIQUAC活度系数方程进行了关联,求得方程的二元交互作用系数,关联结果表明NRTL和UNIQUAC方程对该体系适用较好。由实验数据计算得到衡量N,N-二甲基甲酰胺抽提性能的参数(分配系数、分离因子、选择性系数)。     

甲醇(水)-正己烷-菜籽油拟三元体系的液液平衡测定

通过测定0、20、40℃下甲醇(水)-正己烷-菜籽油拟三元体系的液液平衡数据,绘制出分配比(油在正己烷相中的浓度/油在甲醇相中的浓度)曲线,三元平衡相图及各实验温度下的平衡联结线,并对相平衡数据进行了经验关联。0～40℃间分配比约为120～140,说明油很容易用正己烷把它从甲醇相中提取出来。     

乙醇-苯乙烯-水三元体系液-液相平衡

引　言苯乙烯在温度高于 90℃时极易发生自聚 ,因此在其分离和精制过程中 ,需要采用较高的精馏真空度和加入一些特殊的高效阻聚剂 ,操作的工艺条件较为苛刻 .由于苯乙烯能分别与乙醇和水形成二元共沸物[1] 且在苯乙烯 -乙醇 -水三元相图中能形成一对液 -液部分互溶区 ,因此 ,有可能利用共沸精馏与水析相结合的新工艺来精制和分离苯乙烯[2 ] .然而该三元体系的液 -液平衡数据目前尚未见报道 ,针对这一问题 ,本文报道了该体系液 -液平衡数据的测定和关联 .1　实验部分1.1　试　剂苯乙烯 :ＡＲ ,99.5 % ,上海试剂一厂 ,经液相色谱分析无杂质峰 …     

甲基异丙基甲酮-苯酚-对苯二酚-水的液液相平衡数据测定、模型关联及萃取过程模拟

液液相平衡测定为溶剂萃取及回收的准确模拟、设计和过程开发提供基础数据。以甲基异丙基甲酮为萃取剂,在处理高浓煤化工含酚废水的三元液液相平衡萃取基础上,选定其中典型单元酚苯酚和多元酚对苯二酚为代表物,测定甲基异丙基甲酮-苯酚-对苯二酚-水在常压40℃下的液液相平衡数据。采用NRTL和UNIQUAC活度系数模型对实验数据进行热力学关联,回归得到该四元体系的二元交互作用参数。结果表明该模型可以很好地关联实验数据,两种模型的相对均方根偏差分别小于0.190%和0.266%。进一步将得到的二元交互参数导入流程模拟系统,对萃取单元模块进行计算。当萃取温度40℃、萃取级数5级、相比1：7.72时,甲基异丙基甲酮能将总酚12700 mg×L^-1,多元酚4250 mg×L^-1的含酚废水的酚浓度分别降低至300 mg×L^-1和299 mg×L^-1以下。     

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。     

Measurement and correlation of liquid-liquid equilibrium for the ternary system (water + 1,2-dichloroethane + sulfolane) at 288.15, 298.15, and 308.15 K

Sulfolane is an important aprotic polar solvent. Liquid-liquid equilibrium(LLE) data for the ternary systems of water + 1,2-dichloroethane + sulfolane were measured at temperatures of 288.15, 298.15 and 308.15 K under the atmospheric pressure. The distribution coefficient and selectivity were determined from the measured LLE data, which showed that 1,2-dichloroethane is a suitable extractant for the recovery of sulfolane from its aqueous solution. The nonrandom two-liquid(NRTL) model and the uni...     

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.     

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。     

二乙氧基甲烷-乙醇-水-甘油体系部分组分液液平衡

用液液平衡釜测定了二乙氧基甲烷-水、二乙氧基甲烷-甘油2组二元和二乙氧基甲烷-水-甘油、二乙氧基甲烷-乙醇-甘油、二乙氧基甲烷-水-乙醇3组三元体系常温、常压下的液液平衡数据。用NRTL和UNIQUAC方程对所测二元体系的平衡数据进行了处理。采用单参数法关联了乙醇-甘油体系的模型参数。结合三元体系的液液平衡数据,用NRTL和UNIQUAC方程关联出了三元体系中的第3对模型参数。确定了二乙氧基甲烷-乙醇-水-甘油体系合适的模型及参数,为含二乙氧基甲烷体系的实际分离过程提供了依据。     

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.     

Measurements and correlation of liquid–liquid equilibrium data for the ternary(methyl tert-butyl ketone + o,m, p-benzenediol + water)system at(333.2, 343.2 and 353.2) K

In this work, liquid–liquid equilibria(LLE) data for the ternary system methyl tert-butyl ketone(MTBK) + o, m,p-benzenediol + water were investigated at 333.2 K, 343.2 K and 353.2 K under 101.3 kPa. The performance of MTBK to extract o, m, p-benzenediol from wastewaters was estimated by partition coefficients and separation factors. The Hand and Bachman equations were both applied to check the reliability of the experimental LLE data. Furthermore, the Non-Random Two-Liquid(NRTL) and Universal Quasi Chemical(UNIQUAC) models were applied to correlate the measured LLE data. The results showed a good agreement with the determined ternary LLE data with the root-mean-square error(RMSE) values below 0.71%. MTBK was proved to be a promising extracting agent in extracting benzenediols from effluents.     

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.