Liquid-vapour and liquid-liquid equilibria in the tetrahydrofuran(1)-n-hexane(2)-water(3) system

1980 ◽  
Vol 45 (4) ◽  
pp. 1159-1167 ◽  
Author(s):  
Jiří Lampa ◽  
Jaroslav Matouš ◽  
Josef P. Novák ◽  
Jiří Pick
Keyword(s):  
Experimental Data ◽  
Water System ◽  
Water Systems ◽  
Adequate Description ◽  
Liquid Equilibrium ◽  
Correlation Relation ◽  
Kister Equation

The object of this work is the isobaric vapour-liquid equilibrium (at 101.32 kPa) and the liquid-liquid equilibrium (at 30 and 50°C) in the ternary tetrahydrofuran-n-hexane-water system. Further, the isobaric vapour-liquid equilibrium (at 101.32 kPa) in the binary tetrahydrofuran-n-hexane and tetrahydrofuran-water systems has been established. The experimental data obtained have been fitted to the Redlich-Kister equation. The constants of the correlation relation determined from the data on the vapour-liquid equilibria have been proved to provide an adequate description of the liquid-liquid equilibrium.

Phase equilibria in binary systems containing acetaldehyde

1979 ◽  
Vol 44 (6) ◽  
pp. 1852-1856 ◽  
Author(s):  
Josef Suška
Keyword(s):  
Experimental Data ◽  
Phase Equilibria ◽  
Diethyl Ether ◽  
Binary Systems ◽  
Water Systems ◽  
Liquid Equilibrium ◽  
Kister Equation

The vapour-liquid equilibrium in binary acetaldehyde-diethyl ether, acetaldehyde-ethanol and acetaldehyde-water systems was measured at the pressure of 101.32 kPa. The experimental data were correlated by the two- and three-constant Redlich-Kister equation.

Isothermal and isobaric vapour-liquid equilibrium data in the tetrachloromethane-n-butyl alcohol system

1983 ◽  
Vol 48 (10) ◽  
pp. 2879-2887 ◽  
Author(s):  
Jan Linek
Keyword(s):  
Experimental Data ◽  
Boiling Point ◽  
Butyl Alcohol ◽  
Correlation Equations ◽  
Wilson Equation ◽  
Liquid Equilibrium ◽  
System A ◽  
Equilibrium Data ◽  
Alcohol System ◽  
Kister Equation

Isothermal vapour-liquid equilibrium data at 65, 73 and 80 °C and isobaric ones at 101.3 kPa were measured in the tetrachloromethane-n-butyl alcohol system. A modified circulation still of the Gilespie type was used for the measurements. Under the conditions of measurements, the system exhibits positive deviations from Raoult's law and minimum boiling-point azeotropes. The experimental data were fitted to a number of correlation equations. The best correlation was reached with the Wilson equation but the regression failed in some cases. Therefore the results for the 5th order Redlich-Kister equation are presented.

Phase Equilibria in 4-Methylpentan-2-one-Water and 4-Methylpentan-2-one-4-Methylpentan-2-ol Systems and Their Thermodynamic Description

2000 ◽  
Vol 65 (9) ◽  
pp. 1471-1486 ◽  
Author(s):  
Karel Řehák ◽  
Jaroslav Matouš ◽  
Josef P. Novák ◽  
Andreas Heintz
Keyword(s):  
Phase Equilibria ◽  
Excess Enthalpy ◽  
Thermodynamic Description ◽  
Water System ◽  
Excess Enthalpies ◽  
Liquid Equilibrium ◽  
Heterogeneous Region ◽  
Kister Equation ◽  
Correlation Procedure

Liquid-liquid equilibrium and excess enthalpies at 25, 40 and 60 °C were measured for the 4-methylpentan-2-one-water system. Vapour-liquid equilibrium at 115 °C and 99.96 kPa, and excess enthalpies at 25, 40 and 60 °C were determined for the 4-methylpentan-2-one- 4-methylpentan-2-ol system. The data obtained were correlated together with those given in literature using the superposition of the Wilson and Redlich-Kister equation. The correlation procedure utilised also the data on excess enthalpy measured in a heterogeneous region.

scholarly journals CHEMICAL EQUILIBRIUM IN THE PROPIONIC ACID - ETHANOL - ETHYL PROPIONATE - WATER SYSTEM AND EXTRACTION PROCESSES WITH PARTICIPATION OF DEEP EUTECTIC SOLVENTS

2019 ◽  
Vol 14 (1) ◽  
pp. 47-58 ◽  
Author(s):  
M. A. Toikka ◽  
A. A. Samarov ◽  
A. A. Sadaev ◽  
A. A. Senina ◽  
O. L. Lobacheva
Keyword(s):  
Experimental Data ◽  
Propionic Acid ◽  
Chemical Equilibrium ◽  
Atmospheric Pressure ◽  
Chromatographic Analysis ◽  
Choline Chloride ◽  
Water System ◽  
Deep Eutectic Solvents ◽  
Liquid Equilibrium ◽  
Ethyl Propionate

New experimental data on the chemical equilibrium in the propionic acid - ethanol - ethyl propionate - water system at 293.15 K and atmospheric pressure are presented. Chemically equilibrium compositions corresponding to the liquid-liquid equilibrium were obtained by gas chromatographic analysis. Using the method of nuclear magnetic resonance, homogeneous chemically equilibrium compositions were determined and the concentration equilibrium constant is calculated. The surface of chemical equilibrium and the region of splitting chemically equilibrium compositions are represented in the square of the transformed concentration variables. Comparison of the data obtained in the work with the literature was carried out at 303.15 and 313.15 K. It was found that the region of such compositions decreases with increasing temperature, while the surface of chemical equilibrium does not change the shape and position in the concentration space in the temperature range 293.15-313.15 K and atmospheric pressure. Liquid-liquid equilibrium compositions have also been obtained by gas chromatographic analysis for ethanol and ethyl propionate in the pseudo-ternary system using deep eutectic solvents (DES) based on choline chloride and glycerol / urea in whole range of concentration. The analysis of the extraction properties of DES showed the highest efficiency of DES based on choline chloride and urea. Experimental data on phase equilibrium are processed using Othmer-Tobias and Hand models. The calculated correlation coefficient (more than 0.99) indicates a high internal consistency of the experimental data obtained in this work.

scholarly journals Measurement and Correlation of Liquid-Liquid Equilibrium Data of Mesityl oxide-Diethoxymethane-Water System

2021 ◽  
Vol 257 ◽  
pp. 03004
Author(s):  
Hongyue Guo ◽  
Mai Han ◽  
Yicong Zhao ◽  
Qingsong Li
Keyword(s):  
Experimental Data ◽  
Water System ◽  
Normal Pressure ◽  
Mesityl Oxide ◽  
Binary Interaction ◽  
Liquid Equilibrium ◽  
Good Reliability ◽  
Equilibrium Data ◽  
Binary Interaction Parameters ◽  
Relative Root

To provide essential data for the separation of diethoxymethane and system water using mesityl oxide as the extractant, in this paper, the liquid-liquid equilibrium data of the ternary system of ‘mesityl oxide + diethoxymethane + water’ was measured at 303.2 K, 313.2 K and 323 K under normal pressure. The experimental results showed that partition coefficient and separation factor were both larger than 1, indicating that diethoxymethane and water could be well separated with mesityl oxide. The linear correlation coefficient of Bachman and Hand equation was larger than 0.99, indicating that our experimental data has good reliability. At the same time, the binary interaction parameters of the model were obtained by correlating the experimental data with the NRTL and UNIQUAC models. The relative root mean square error (RMSD) of the experimental value and the calculation formula was less than 0.79%, indicating that both the NRTL and UNIQUAC models can be well associated with experimental data.

scholarly journals Use of the SSF equations in the Kojima-Moon-Ochi thermodynamic consistency test of isothermal vapour-liquid equilibrium data

2000 ◽  
Vol 65 (12) ◽  
pp. 877-889
Author(s):  
Jelena Jelic ◽  
Aleksandar Tasic ◽  
Bojan Djordjevic ◽  
Slobodan Serbanovic
Keyword(s):  
Experimental Data ◽  
Binary Systems ◽  
Thermodynamic Consistency ◽  
Data Sets ◽  
Liquid Equilibrium ◽  
Consistency Test ◽  
Equilibrium Data ◽  
Vle Data ◽  
Kister Equation

The Kojima-Moon-Ochi (KMO) thermodynamic consistency test of vapour-liquid equilibrium (VLE) measurements for 32 isothermal data sets of binary systems of various complexity was applied using two fitting equations: the Redlich-Kister equation and the Sum of Symmetrical Functions. It was shown that the enhanced reliability of the fitting of the experimental data can change the conclusions drawn on their thermodynamic consistency in those cases of VLE data sets that are estimated to be near the border of consistency.

Properties of Refrigerants from Cubic Equations of State

2008 ◽  
Vol 59 (5) ◽  
Author(s):  
Viorel Feroiu ◽  
Dan Geana ◽  
Catinca Secuianu
Keyword(s):  
Experimental Data ◽  
Vapor Pressure ◽  
Equations Of State ◽  
Ternary Mixtures ◽  
Volumetric Properties ◽  
Mixing Rules ◽  
Saturation Curve ◽  
Equilibrium Thermodynamic ◽  
Liquid Equilibrium ◽  
Binary And Ternary Mixtures

Vapour � liquid equilibrium, thermodynamic and volumetric properties were predicted for three pure hydrofluorocarbons: difluoromethane (R32), pentafluoroethane (R125) and 1,1,1,2 � tetrafluoroethane (R134a) as well as for binary and ternary mixtures of these refrigerants. Three cubic equations of state GEOS3C, SRK (Soave � Redlich � Kwong) and PR (Peng � Robinson) were used. A wide comparison with literature experimental data was made. For the refrigerant mixtures, classical van der Waals mixing rules without interaction parameters were used. The GEOS3C equation, with three parameters estimated by matching several points on the saturation curve (vapor pressure and corresponding liquid volumes), compares favorably to other equations in literature, being simple enough for applications.

Sewers and the Quality of Canals and Ditches in Amsterdam

1993 ◽  
Vol 27 (5-6) ◽  
pp. 61-67 ◽  
Author(s):  
E. Jacobs ◽  
J. W. van Sluis
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Sediment Quality ◽  
Water System ◽  
Water Systems ◽  
Sewer System ◽  
Water And Sediment ◽  
Combined Sewer ◽  
Water And Sediment Quality

The surface water system of Amsterdam is very complicated. Of two characteristic types of water systems the influences on water and sediment quality are investigated. The importance of the sewer output to the total loads is different for both water systems. In a polder the load from the sewers is much more important than in the canal basin. Measures to reduce the emission from the sewers are much more effective in a polder. The effect of these measures on sediment quality is more than the effect on water quality. Some differences between a combined sewer system and a separate sewer system can be found in sediment quality.

Design of rural water systems using dynamic models

1999 ◽  
Vol 39 (4) ◽  
pp. 221-231
Author(s):  
A. H. Lobbrecht
Keyword(s):  
Dynamic Models ◽  
Water System ◽  
Design Procedure ◽  
Real Data ◽  
Water Systems ◽  
Design Methods ◽  
Water Quality Criteria ◽  
Rural Water ◽  
Rural Water Systems ◽  
The Way

The properties of main water ways and infrastructure of rural water systems are often determined by very general design methods. These methods are based on standards that use only little information of the actual water system. Most design methods applied in the Netherlands are based on land use and soil texture. Standards have been developed on the basis of generalized properties of water systems. Details of the actual layout of the water system and the way in which that system is controlled, are usually not incorporated. Present-day dynamic simulation programs and the computer power currently available enable more detailed modeling and incorporation of location-specific data into models. Such models can be used to design the water system and can include real data. A model-based design method is introduced, in which the actual situation of the water system is taken into consideration as well as the way in which the water system is controlled. Stochastics concerning the operation and availability of controlling infrastructure are included in the method. Models can be evaluated by including real data. In this way the actual safety of the water system, for example during floods, can be determined. Water-quantity design criteria can be incorporated as well as water-quality criteria. Application of the method makes it possible to design safe water systems in which excess capacities are avoided and in which all requirements of interest are met. The method, called the ‘dynamic design procedure’, can result in considerable savings for water authorities when new systems have to be designed or existing designs have to be reconsidered.

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