Isobaric vapor-liquid equilibrium for binary systems of isoamyl acetate+isoamyl alcohol and isoamyl acetate+n-hexanol at 50.00 and 101.33 kPa

doi:10.11949/j.issn.0438-1157.20160924

Abstract

Abstract:

Isobaric vapor-liquid equilibrium data of the binary systems isoamyl acetate+isoamyl alcohol and isoamyl acetate+n-hexanol at 50.00 and 101.33 kPa were measured using a vapor-liquid equilibrium still. The isoamyl acetate+isoamyl alcohol system formed a minimum temperature azeotrope at 50.00 kPa. The thermodynamic consistency of the VLE experimental data were checked by Herington method, and the results were satisfied with Gibbs-Duhem's thermodynamic consistency. The experimental measurements for the binary systems were correlated by nonrandom two-liquid (NRTL), Wilson and universal quasichemical (UNIQUAC) activity coefficient models. Then, the corresponding parameters for the three models were obtained. Compared with the experimental data, the root-mean-square deviations of the boiling temperature and the vapor mole fraction calculated with the correlated parameters were less than 0.20 K and 0.0050, respectively. The calculated results showed that the experimental data agreed well with NRTL, Wilson and UNIQUAC models. Wilson activity coefficient model was used to predict the azeotropic phenomenon of isoamyl acetate+isoamyl alcohol, which indicated that the azeotrope would disappear at 98.4 kPa. This work provided important engineering data for chemical database and further study in the engineering design containing isoamyl acetate.

Key words: vapor-liquid equilibrium, isoamyl acetate, isoamyl alcohol, n-hexanol, thermodynamic model

摘要：

在50.00和101.33 kPa下，采用改进的Rose汽液平衡釜测量乙酸异戊酯+异戊醇和乙酸异戊酯+正己醇体系的汽液平衡数据。乙酸异戊酯+异戊醇在50.00 kPa下形成最低共沸物。使用Herington法对汽液平衡数据进行热力学一次性检验，结果表明测得的汽液平衡数据符合热力学一致性。对实验数据使用NRTL、Wilson和UNIQUAC活度系数模型进行关联，回归获得相应的二元交互参数，模型计算的温度和组成与实验值相比均方差小于0.20 K和0.0050，表明3种模型的拟合结果与实验数据吻合较好。通过Wilson模型预测乙酸异戊酯+异戊醇体系在98.4 kPa时共沸点消失。为化工数据库增添了内容，为乙酸异戊酯体系的工程设计和进一步深入研究奠定了基础。

关键词: 汽液平衡, 乙酸异戊酯, 异戊醇, 正己醇, 热力学模型

CLC Number:

O642.42

ZHOU Feng, CHEN Changxu, XU Chunjian. Isobaric vapor-liquid equilibrium for binary systems of isoamyl acetate+isoamyl alcohol and isoamyl acetate+n-hexanol at 50.00 and 101.33 kPa[J]. CIESC Journal, 2017, 68(2): 560-566.

周峰, 陈长旭, 许春建. 乙酸异戊酯+异戊醇和乙酸异戊酯+正己醇体系汽液平衡[J]. 化工学报, 2017, 68(2): 560-566.

References 17

[1]	LIU X G, YIN Y B, SHI M C. Esterification of acetic acid with isoamyl alcohol over expandable graphite catalyst[J]. Chem. World, 1994, 35:350-351.
[2]	KROKHIN N G. Equiibrium liquid-vapor ratios in the system acetic acid-isoamyl alcohol-isoamyl acetate (Ⅱ):Binary systems acetic acidisoamyl acetate and isoamyl alcohol-isoamyl acetate[J]. Zh. Fiz. Khim., 1967, 41:1509-1511.
[3]	EMILIO A. Isobaric vapor-liquid equilibrium for binary mixtures of 3-methyl-1-butanol +3-methyl-1-butyl ethanoate and 1-pentanol+pentyl ethanoate at 101.3 kPa[J]. J. Chem. Eng. Data, 2010, 55(6):2349-2354.
[4]	HERRINGTON E F G. Tests of consistency of experimental isobaric vapor-liquid equilibrium data[J]. J. Inst. Pet., 1951, 37:467-470.
[5]	RENON H, PRAUSNITZ J M. Local compositions in thermodynamic excess functions for liquid mixtures[J]. AIChE J., 1968, 14(1):135-144.
[6]	WILSON G M. A new expression for the excess free energy of mixing[J]. J. Am. Chem. Soc., 1964, 86(2):127-130.
[7]	ABRAMS D S, PRAUSNITZ J M. Statistical thermodynamics of liquid mixtures:a new expression for Gibbs energy of partly or completely miscible system[J]. AIChE J., 1975, 21(1):116-128.
[8]	ZHANG J, LIU Y, MENG N. Isobaric vapor-liquid equilibria of binary systems (propyl acetate+n-pentanol), (propyl acetate +1-methyl-1-butanol), and (propyl acetate +3-methyl-1-butanol) at 101.3 kPa[J].J. Chem. Eng. Data, 2013, 58(11):3254-3258.
[9]	RAO D S, RAO K V, PRASAD A R, et al. Extraction of acetonitrile from aqueous mixtures (Ⅱ):Ternary liquid equilibria[J]. J. Chem. Eng. Data, 1979, 24(3):241-243.
[10]	SHEU Y, TU C. Densities and viscosities of binary mixtures of isoamyl acetate, ethyl caproate, ethyl benzoate, isoamyl butyrate, ethyl phenylacetate, and ethyl caprylate with ethanol at T=(288.15, 298.15, 308.15, and 318.15K)[J]. J. Chem. Eng. Data, 2006, 51(2):496-503.
[11]	REDDY K S, SWAMY A V N, PRASAD T E. Vapor-liquid equilibria of binary mixtures formed by hexan-1-ol with chloroethanes and chloroethenes at 95.6 kPa[J]. J. Chem. Eng. Data, 2010, 55(6):2073-2076.
[12]	MARLUS P R, MARIA A K. Vapor-liquid equilibria of binary and ternary mixtures of benzene, cyclohexane, and chlorobenzene at 40.0 kPa and 101.3 kPa[J]. J. Chem. Eng. Data, 2001, 46(2):256-260.
[13]	CHEN R Q, ZHONG L, XU C J. Isobaric vapor-liquid equilibrium for binary systems of toluene+ethanol and toluene+isopropanol at (101.3, 121.3, 161.3, and 201.3) kPa[J]. J. Chem. Eng. Data, 2011, 57(1):155-165.
[14]	SMITH J M, VAN N H C, ABBOTT M M. Introduction to Chemical Engineering Thermodynamics[M]. 7th ed. New York:McGraw-Hill, 2005.
[15]	YAWS C L. Chemical Properties Handbook:Physical, Thermodynamic, Environmental, Transport, Safety, and Health Related Properties for Organic and Inorganic Chemicals[M]. New York:McGRAW-Hill, 1999.
[16]	马沛生, 李永红. 化工热力学[M]. 2版. 北京:化学工业出版社, 2009:148-151. MA P S, LI Y H. Chemical Engineering Thermodynamics[M]. 2nd ed. Beijing:Chemical Industry Press, 2009:148-151.
[17]	WISNIAK J. A new test for the thermodynamic consistency of vapor liquid equilibrium[J]. Ind. Eng. Chem. Res., 1993, 32(7):1531-1533.