Experimental Vapor–Liquid Equilibrium for the Quaternary Carbon Dioxide + Ethanol + Thiophene + Pentane/Nonane Systems

Measurement and modeling of isobaric vapor – Liquid equilibrium and isothermal interfacial tensions of ethanol + hexane + 2,5 – Dimethylfuran mixture

In this study, the experimental results exhibit that the mixture of water + acetic acid + methyl acetate + p- xylene has interesting phase behaviors of vapor-liquid equilibrium (VLE) and vapor-liquid-liquid equilibrium (VLLE) under pressure of 101.32 kPa. The VLE and VLLE data were obtained with a condensed-vapor-phase-recirculating still as described in the text. The experimental data are useful to the design and operation of the purification process of acetic acid. The experimental VLE and VLLE data were then correlated with the NRTL and the UNIQUAC activity coefficient mod- els, respectively, as described in the text. Attributed to the presence of acetic acid, which is a strong polar component, the association effect of molecules of this component in the vapor phase was considered and handled with the approach of Hayden and O'Connell for correlation. production, will form a p-xylene-water azeotrope with water content larger than the azetropes of water-ethyl acetate, wa- ter-propyl acetate, water-isobutyl acetate, and water-butyl acetate. The advantage of the large water content and that of p-xylene is a by-product of reaction causes it to be consid- ered as one of the feasible entrainer. To study the feasibility of using p-xylene as an entrainer, the thermodynamic data of the quaternary mixture of water + acetic acid + methyl ace- tate + p-xylene are necessary. Unfortunately, the phase equilibria of this mixture have not been reported in the litera- ture. In this study, the phase behaviors of vapor-liquid equi- librium (VLE) and vapor-liquid-liquid equilibrium (VLLE) were observed and the experimental data of phase equilib- rium of this quaternary mixture useful for process design were provided. Then the experimental VLE and VLLE data were correlated with the non-random two liquid (NRTL) and the universal quasi-chemical (UNIQUAC) activity coeffi- cient models, respectively, as discussed in the latter part of this report.

Isobaric vapor liquid equilibrium (VLE) data of the reactive quaternary system methanol (1) + water (2) + methyl lactate (3) + lactic acid (4) are presented in this paper. The experimental data were correlated using the UNIQUAC model to describe the chemical and phase equilibrium. The UNIQUAC parameters for some of the binary, nonreactive systems involved in the quaternary mixture were obtained from published VLE data and, in the case of the system water + lactic acid, from experimental VLE data reported in this paper. The rest of the binary UNIQUAC parameters were obtained by an optimization of the correlation of the experimental quaternary VLE data. The results obtained from the correlation were found to be in good agreement with experimental data. The reaction equilibrium constant was also calculated for each experimental data point. A three-dimensional phase diagram was constructed for the quaternary reactive system by using transformed composition variables. No reactive azeotrope was found.

Vapor–liquid equilibrium for the ternary carbon dioxide + ethanol + n-hexane and quaternary carbon dioxide + ethanol + n-hexane + thiophene systems

Isobaric ternary vapour–liquid equilibrium of methanol(1) + diisopropyl ether(2) + isopropyl alcohol(3) along with methanol + isopropyl alcohol binary data at atmospheric and sub-atmospheric pressures

Studies on the effect of addition of piperazine and sulfolane into aqueous solution of N-methyldiethanolamine for CO2 capture and VLE modelling using eNRTL equation

In this work, new experimental vapor–liquid equilibrium (VLE) data of lead-antimony alloy (Pb-Sb alloy) in vacuum distillation are reported. The activity coefficients of components of Pb-Sb alloy were calculated by using the NRTL model. The calculated average relative deviations were ±0.1425 and ±0.2433 pct, and the average standard deviations were ±0.0009 and ±0.0007, respectively, for Pb and Sb. The VLE phase diagrams, such as the temperature composition (T-x) and pressure composition (P-x) diagrams of Pb-Sb alloy in vacuum distillation were predicted based on the NRTL model and VLE theory. The predicted results are consistent with the new experimental data indicating that VLE phase diagrams obtained by this method are reliable. The VLE phase diagrams of alloys will provide an effective and intuitive way for the technical design and realization of recycling and separation processes. The VLE data may be used in separation processes design, and the thermodynamic properties as the key parameters in specific applications.

Experimental vapor–liquid equilibrium (VLE) data of binary and ternary systems are reported covering all of the phase envelopes up to near the critical point. The carbon dioxide + dodecane, carbon dioxide + benzothiophene, and carbon dioxide + nonane + benzothiophene systems were studied at (318.14, 344.75, 373.23, and 417.91) K, 373.93 K, and (313.09, 343.73, and 373.74) K, respectively. The apparatus is based on the static–analytic method with an on-line ROLSI (rapid on-line sampler–injector) sampler to allow fast determination of the VLE. Standard uncertainties for the measured properties in this work were estimated to be p ± 0.01 MPa, T ± 0.03 K, liquid mole fraction xCO2 ± 0.0036, and vapor mole fraction yCO2 ± 0.0016. The experimental VLE data for carbon dioxide + dodecane were found to be in agreement with those available in the literature at 318 K. Furthermore, the corresponding results for the ternary system indicate a high selectivity of nonane in the vapor phase instead of benzothiophene. Data obtained in this work were correlated with the Peng–Robinson equation of state using the Wong–Sandler mixing rules.

Vapor-liquid equilibria for binary systems carbon dioxide + 1,1,1,2,3,3-hexafluoro-3-(2,2,2-trifluoroethoxy)propane or 1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane at 303.15–323.15 K

Isobaric vapor-liquid equilibrium for binary system related to the organophosphoric extractant of D2EHPA + n-dodecane and TBP + n-dodecane at 0.13, 2.40 and 6.67 kPa

Thermodynamic properties of water + normal alcohols and vapor-liquid equilibria for binary systems of methanol or 2-propanol with water

VLE measurement of binary systems 1-butyl-3-methylimidazolium-based ionic liquids and ethanol or water

Experimental determination and theoretical prediction of the vapor–liquid equilibrium and interfacial tensions of the system methyl-tert-butyl ether + 2,5-dimethylfuran

Vapor-liquid equilibrium phase behavior of binary systems of carbon dioxide with dimethyl succinate or dimethyl glutarate

Vapor–liquid equilibria and phase densities at saturation of carbon dioxide + 1-butanol and carbon dioxide + 2-butanol from 313 to 363 K