Values Of Excess Molar Volume Research Articles

Volumetric, acoustic and optical properties of binary mixtures of 2-propanol with n-alkanes (C6-C10) from 293.15 K to 303.15 K

Densities, ultrasonic speeds and refractive indices of 2-propanol + n-alkanes (C6-C10) systems were experimentally determined at 293.15 K to 303.15 K. Calculated excess molar volume, deviation in ultrasonic speed, refractive index, excess isentropic compressibility and excess intermolecular free length were correlated with Redlich-Kister equation. The excess volume was also interpreted by Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. While the excess molar volume were predicted well with FTB model, PFP theory able to describe sign and magnitude of excess molar volume values in propanol rich region but failed to describe in propanol lean region. For the theoretical estimation of ultrasonic speed and refractive index values, various correlation and mixing rules were also applied.

Densities, Viscosities and Excess Properties of Binary Mixtures of 2-Methoxy-2-methylpropane with iso-Propanol

Densities (r) and viscosities (h) of the binary systems 2-Methoxy-2-methylpropane with iso-propanol were measured at temperatures (288.15, 293.15, 298.15, 303.15 and 308.15) K and atmospheric pressure, over the whole composition range. The density and viscosity of the solutions were correlated with the temperature with a linear equation, respectively with Guzman�s equation. The excess values of molar volume (VE), viscosity (hE) and molar Gibbs energy (DG*E) were calculated from experimental measurements. The excess functions of the binary systems were fitted to Redlich-Kister equation. Viscosity results were fitted to the equations of Grunberg-Nissan, Heric-Brewer, Jouyban-Acree and McAllister.

Thermodynamic properties of the dodecylbenzenesulfonic acid-acetone binary liquid mixture using a modified flory theory

<p>Prigogine–Flory–Patterson (P-F-P) theory was applied for the correlation the experimental data of excess molar volume for the binary liquid mixture of DBSA-Acetone at the temperature range of (293.15-303.15 K). The three contribution terms (pressure, interaction and free volume) in the P-F-P equation were compared with the total effect of P-F-P equation. A positive excess molar volume were obtained at all the range of mole fraction and at all the temperatures. The maximum value of excess molar volume was positioned at the 0.4 mole fraction. Eyring-Flory-Huggins theory was found useful in the estimation of the viscosity deviation variation with mole fraction at the same temperature range. A negative deviation was found in the viscosity for all the range of temperature and mole fraction. The maximum deviation in the viscosity was found at the mole fraction of 0.4. The increase in the negative deviation values with temperature was interpreted as a result of the decrease in the attractive forces between the like molecules.</p><p>Chemical Engineering Research Bulletin 20(2018) 30-35</p>

Correlation Studies of Cyclohexanone/(C5–C10) Alkan-1-ol Binary Mixtures: PC-SAFT Model and Free Volume Theory

In this article the behavior of cyclohexanone + 1-alkanol, namely, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, and 1-decanol, binary mixtures through the density and viscosity measurements has been studied as a function of composition and within the temperature range of 293.15–323.15 K. The excess molar volume and viscosity deviations have been calculated and fitted by the Redlich–Kister polynomial equation. For binary mixtures of cyclohexanone + 1-pentanol, values of excess molar volume are negative and for other mixtures are positive. For all binary systems viscosity deviations are negative and increase with the alkyl chain of alcohol. The results provide information on the interactions among the molecules in the pure state as well as the binary liquid mixtures. The measured densities and viscosities have been applied to test the applicability of the PC-SAFT and free volume models.

Magnetorheological and Volumetric Properties of Starch and Polyethylene Glycol Solutions in the Presence of NiO Nanoparticles

The effect of NiO nanoparticles on the rheological and volumetric properties of dilute solutions of starch-NaOH-H2O, PEG400-PEG2000 and PEG400-PEG6000 were investigated. Achieve this aim requires to prepare the stable nanofluids. Therefore, nanoparticles of NiO were added to these solutions and dispersed by a shaker and an ultrasonic bath for making the homogeneous nanofluids. The UV-Vis spectroscopy, zeta potential and dynamic light scattering have been used to specify the stability and particle size distribution of colloidal solutions studied. Fluid flow and suspense structure of NiO nanoparticles in the solutions of starch-NaOH-H2O, PEG400-PEG2000 and PEG400-PEG6000 were studied by measuring the magnetorheological properties at T=298.15 K. Bingham plastic, Herschel-Bulkley and Carreau-Yasuda models have been applied for modeling the magnetorheological properties of nanofluids. Density values of NiO-starch-NaOH-H2O, NiO-PEG400-PEG2000 and NiO-PEG400-PEG6000 nanofluids have also been measured at T = (298.15, 308.15 and 318.15) K. The excess molar volumes were calculated from the density data for highlighting the interparticle interactions occurred in nanofluids. Singh et al. equation was used for fitting the excess molar volume values.

Measurement and correlation of the physical properties of aqueous solutions of ammonium based ionic liquids

In this study, thermo physical properties such as density, viscosity, refractive index and surface tension of aqueous solutions of tetramethylammonium hydroxide (TMAOH), tetraethylammonium hydroxide (TEAOH), tetrapropylammonium hydroxide (TPAOH) and tetrabutylammonium hydroxide (TBAOH) was investigated as a function of temperature. These properties were measured in temperatures ranging from 298.15 to 333.15 K and the temperature was increased by an interval of 5 K from 298.15 K and after 303.15 K, it was increased by an interval of 10 K, while the concentrations of all the aqueous solutions were changed from 2.5 to 30 mass percent. The results revealed that the measured properties of all aqueous ILs are inversely related to temperature, while the increase in concentration had different effects on these properties. In the case of density, an increase in the concentration of ILs TMAOH and TEAOH increased their density, while the increase in the concentration of TPAOH and TBAOH decreased their density. On the other hand, the viscosities and refractive indices of all aqueous ILs increased with an increase in concentration, but the surface tensions decreased with the increase in concentration. The derived properties including thermal expansion and excess molar volume of all the aqueous ILs were determined using density data. The thermal expansion data showed an increasing trend with an increase in the temperatures and concentrations of ILs whereas the negative values of excess molar volumes decreased with an increase in temperatures. The correlation of thermo physical properties with temperatures exhibits a good agreement between experimental and predicted values.

Thermophysical properties of 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide with 2-ethoxyethanol from T = (298.15 to 323.15) K at atmospheric pressure

Density (ρ) and speed of sound (u) data is determined for various binary compositions of 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ([Bmim][NTf2]) and 2-ethoxyethanol (2EE) at different temperatures. The experimental data of density and speed of sound is used to calculate the values of excess molar volume, excess isentropic compressibility, excess intermolecular free length and excess speed of sound. The variations in these parameters are analysed to understand the nature of molecular interactions between the chemical species. Redlich-Kister equation is used to estimate the deviations between the calculated and experimental excess values. The values of partial molar volume, excess partial molar volume and excess partial molar volume at infinite dilution have been calculated. The trends of variation of these properties have been interpreted in light of the solute-solvent interactions occurring in the system. Further, the experimental FT-IR analysis is used to study the interactions between the chemical species.

Thermodynamic Excess Properties and Intermolecular Interaction Using Fourier Transform Infrared for the Dodecylbenzenesulfonic Acid-Acetone Binary Liquid Mixture

Density, viscosity, and surface tension for the DBSA-Acetone system at the temperatures (293.15, 298.15, 301.15 K) have been investigated experimentally. Excess molar volume, viscosity deviation, surface tension deviation, and molar excess Gibbs free energy deviation are calculated at (293.15, 298.15, 301.15 K). All the non-ideal properties calculated are fitted to Redlich-Kister (RK) equation. FTIR spectrum of the DBSA-Acetone mixture have been characterized for studying the intermolecular interaction. The result of molar excess Gibbs free energy deviation and FTIR studies showed a weak hydrogen bonding for the mixture solution. While, the intramolecular interaction is strong in the case of pure DBSA and acetone due to the self-association of DBSA molecule or decreasing the dipole-dipole of acetone molecule. The result of FTIR supported the result of thermodynamic excess where the excess molar volumes were positive. The calculated values of excess molar volume are positive for all the temperatures ranging from (293.15 - 301.15 K). while, the values of viscosity deviation, surface tension deviation, and molar excess Gibbs free energy deviation are negative for all the temperatures studied.

Effect of \u03b3-Fe2O3 nanoparticles on rheological and volumetric properties of solutions containing polyethylene glycol

The effect of γ-Fe2O3 nanoparticles on the rheological and volumetric properties of polyethylene glycol with molar mass of 400 (g mol−1), PEG400, and the dilute solutions of PEG400-PEG2000 and PEG400-PEG6000 was investigated. PEGs with molar masses of 2000 and 6000 (g mol−1) were dissolved in PEG400 to prepare the homogeneous solutions. Rheological properties and the density values for these solutions were measured. Nanoparticles of γ-Fe2O3 were added to these solutions and dispersed by an ultrasonic bath for making the homogeneous nanofluids. The UV–Vis spectroscopy, zeta potential and dynamic light scattering have been used to specify the stability and particle size distribution of colloidal solutions studied. Fluid flow and suspense structure of γ-Fe2O3 nanoparticles in the base fluids of PEG400, PEG400-PEG2000 and PEG400-PEG6000 were studied by measuring the magnetorheological properties at T = 298.15 K. Bingham plastic, Herschel–Bulkley, and Carreau–Yasuda models have been applied for modeling the magnetorheological properties of nanofluids. Interparticle interactions that occurred in the investigated nanofluids can be determined by calculating the excess molar volume values. This requires to measure the density data for γ-Fe2O3-PEG400, γ-Fe2O3-PEG400-PEG2000 and γ-Fe2O3-PEG400-PEG6000 systems at T = (298.15, 308.15 and 318.15) K. The excess molar volumes were calculated from these data and fitted with Ott et al. and Singh et al. equations.

Thermophysical properties of binary mixtures of (methanol or 1-ethyl-3-methylimidazolium acetate + furfural or furfuryl alcohol) at various temperatures

In this work, experimental densities, speed of sound, and refractive indices for the binary mixtures {methanol (x1) or 1-ethyl-3-methylimidazolium acetate [EMIM][OAc]+furfural or furfuryl alcohol (x2)} were measured at 298.15, 303.15, 308.15, 313.15 and 318.15 K. From the experimental data, excess molar volume, VmE, isentropic compressibility, κs, molar refractions, R, and deviation in refractive index, ∆n, were calculated. The obtained values of excess molar volumes and changes of refractive index on mixing were correlated by the Redlich-Kister equation. The Lorentz–Lorenz equation was applied to predict the density and calculate the excess molar volume of the binary mixtures. These results were interpreted in terms of the molecular interactions that occur between the components of the mixture.

Liquid density, viscosity, surface tension, and spectroscopic investigation of 1,2-ethanediamine + 1,2-propanediol for CO2 capture

Liquid densities, viscosities, and surface tensions play significant roles in fluid flow and industrial applications for CO2 capture. These data of 1,2-ethanediamine (EDA)+1,2-propanediol (PPD) binary system were measured under atmospheric pressure at T=(293.15 to 318.15) K throughout the entire concentration range. According to the experimental viscosities and densities, the viscosity deviation and excess molar volume values were respectively calculated, and the Redlich-Kister equation was used to fit the coefficients and to evaluate the deviations. The system exhibited negative excess molar volume values with a minimum at x1≈0.54 at experimental temperatures, and a maximum was found at x1≈0.76 for viscosity deviation. The solubility of CO2 was measured at different flow rates, and the maximum solubility was about 0.57g CO2 per 1g EDA+PPD system at 250mL/min CO2 flow rate. Furthermore, the intermolecular interaction of PPD with EDA was systemically discussed according to FTIR, UV–Vis, 1H NMR, and fluorescence spectral results, surface tension, and electrical conductivity data, and it was expressed as the form of HO-CH2(CH3)CH2O-H·NH2CH2CH2N(H2).

Volumetric and viscometric properties of binary liquid mixtures as potential solvents for flue gas desulfurization processes

Desulphurization processes (FGD) of flue gases from the thermal power and industrial plants, based on organic liquid solvents with mechanism of physical absorption (tetraethylene glycol dimethyl ether) or combination of physical and chemical absorption (N-methyl-2-pyrrolidone), recently gained its significance. The research results presented in this paper include density and dynamic viscosity measurements of following binary systems at atmospheric pressure: polyethylene glycol 200+tetraethylene glycol dimethyl ether, polyethylene glycol 400+tetraethylene glycol dimethyl ether, in temperature range from 288.15 to 333.15K, and binary systems polyethylene glycol 200+N-methyl-2-pyrrolidone and polyethylene glycol 400+N-methyl-2-pyrrolidone, in temperature range from 288.15 to 323.15K. In order to analyze and comment intermolecular interactions, calculated values of excess molar volumes and viscosity deviations were used. Strong, physical interactions of dipole-dipole type or formation of intermolecular hydrogen bonds lead and contribute to negative VE values that occur in these systems. Calculated values of excess and deviation properties were interpolated using the Redlich-Kister polynomial equation. Viscosity modeling has been performed, using predictive, group contribution models (UNIFAC – VISCO and ASOG – VISCO) as well as correlative models (McAlister, Eyring – UNIQUAC and Eyring – NRTL). For simultaneous modeling of excess molar volumes and viscosities, model based on the equation of state was used. For investigated systems, correlative McAllister models gave the best results and can be used for viscosity calculations.

Densities and viscosities for binary mixtures of n-heptane with alcohols at different temperatures

Densities (?) and viscosities (?) of the binary systems n-heptane with alcohols (ethanol, propan-1-ol and propan-2-ol) were measured at temperatures between 288.15 and 308.15 K and at atmospheric pressure, over the whole composition range. The excess values of molar volume (VE) and viscosity (?E) were calculated from experimental measurements. The excess functions of the binary systems were fitted to Redlich?Kister Equation. Comparison between experimental excess molar volume and the one calculated from Flory and Prigogine?Flory?Patterson theories, has also been done. The viscosity results were fitted to the equations of Grunberg?Nissan, Heric?Brewer, Jouyban?Acree and McAllister. Also, the activation energies of viscous flow have been obtained and their variations with compositions have been discussed.

Studies of volumetric, viscometric and molar properties of diisopropyl amine with 1-alkanols (C 6 –C 10 ) at different temperatures

Abstract This paper presents the experimental measurements of densities, ρ , viscosities, η and speeds of sound, u of (Diisopropylamine (DIIPA) + 1-Hexanol, + 1-Octanol, + 1-Decanol) over the entire composition range at (293.15 to 313.15) K and atmospheric pressure. We examined the influence of temperature and alcohol chain length upon the various studied properties. Negative values of excess molar volume V m E and excess molar isentropic compressibilities, K S , m E indicates the presence strong intermolecular interactions. The results of deviations in speeds of sound, u D , viscosity deviations, Δ η and Gibbs excess free energy of activation of viscous flow, Δ G ⁎ E also supports the conclusion drawn from V m E and K S , m E . The outcomes of V m E have been correlated to Prigogine –Flory –Patterson theory (PFP).

Nature of the interactions in binary mixtures of 1-butyl-3-ethylimidazolium bromide ionic liquid with methanol and ethanol

Physicochemical properties and nature of the interactions in methanol and ethanol solutions of 1-butyl-3-ethylimidazolium bromide ionic liquid, [C4C2im]Br, have been investigated experimentally measuring density over the whole composition range at selected temperatures and atmospheric pressure. From the experimental densities, the excess properties and partial molar volumes of the components at infinite dilution were calculated, as well as the excess molar expansibility at infinite dilution and isobaric thermal expansion coefficients. Obtained negative values of excess molar volumes with pronounced minimum at xIL ≈ 0.3 indicate strong ion–alcohol interactions and better packing due to differences in the size and shape of the molecules. Results are compared with those obtained for aqueous solutions of investigated ionic liquid and discussed in terms of hydrogen bond formation. Also, apparent molar volumes for {[C4C2im]Br + alcohol} systems show more pronounced deviations comparing to aqueous solutions of [C4C2im]Br confirming stronger self-association of the water molecules.

Density, Viscosity, and Refractive Index Data for a Ternary System of Wine Congeners (Ethyl Butyrate + Diethyl Succinate + Isobutanol) in the Temperature Range from 288.15 to 323.15 K and at Atmospheric Pressure

Density, viscosity, and refractive index data for the ternary system ethyl butyrate + diethyl succinate + isobutanol and binary system ethyl butyrate + diethyl succinate have been measured in the temperature range 288.15–323.15 K, with temperature step of 5 K, and at atmospheric pressure. The measurements were performed on an Anton Paar DMA 5000 digital vibrating tube densimeter, Anton Paar SVM 3000 digital viscometer, and Anton Paar RXA 156 refractometer. Based on the corresponding binary data, as well as ternary data, presented in this work, excess molar volumes (VE), viscosity deviations (Δη), and refractive index deviations (ΔnD) were determined and fitted by the Redlich–Kister and Nagata–Tamura polynomial equations. The influence of mixture composition on values of excess molar volume, deviation functions, and the molecular interactions present in the mixtures was further discussed.

Investigation of molecular interactions in binary mixtures (dichloromethane + aliphatic alcohols) at T = (298.15 to 308.15) K: Experimental, ERAS analyses and COSMO-RS predictions

Densities ρ, and ultrasonic velocities, u of binary mixtures of pure dichloromethane (DCM) with methanol (Me-OH), ethanol (Et-OH), propan-1-ol (Pr-OH) and butan-1-ol (Bu-OH) including those of their binary liquids were measured at (298.15, 303.15 and 308.15) K. From the experimental data the excess molar volume, VmE, deviation in isentropic compressibility, Δks, deviation in specific acoustic impedance, ΔZ, deviation in intermolecular free length, ΔLf, and deviation in ultrasonic velocity, Δu were calculated. The experimental excess molar volume values were correlated with theoretical values derived from extended real association solution model (ERAS). The σ-profile of dichloromethane and aliphatic alcohols were computed with conductor-like screening model (COSMO-RS) and are interpreted to show the possible interactions between the mixing components.

Volumetric, viscometric, spectral studies and viscosity modelling of binary mixtures of esters and alcohols (diethyl succinate, or ethyl octanoate + isobutanol, or isopentanol) at varying temperatures

Density, viscosity and refractive index of four binary mixtures consisting of diethyl succinate or ethyl octanoate+2-methyl-1-propanol or 3-methyl-1-butanol have been measured at atmospheric pressure and over the temperature range from 288.15K to 323.15K. Excess and deviation functions have been calculated from these data and fitted to the Redlich-Kister equation. The values of excess molar volume and deviation functions, with FT-IR study, were further used in the analysis of molecular interactions present in the mixture as well as the temperature influence on them. Molar excess Gibbs free energies of activation of viscous flow were additionally calculated from measured density and viscosity data for better understanding of present molecular interactions. Viscosity modelling was done with two approaches, predictive by group contribution models (UNIFAC-VISCO and ASOG-VISCO), and correlative by one to three-parameter models (Teja-Rice, Grunberg–Nissan, McAlister, Eyring-UNIQUAC and Eyring-NRTL). The obtained results were compared with experimental data and conclusions about applied approaches and models were made.

Thermodynamic and spectroscopic properties of binary mixtures of n-butylammonium butanoate ionic liquid with alcohols at T = (293.15–313.15) K

In this work, density and speed of sound of binary mixtures of {n-butylammonium butanoate ionic liquid (N4Bu)+alcohols (methanol, ethanol, 1-propanol, 1-butanol and 1-pentanol)} have been measured as a function of composition at T=(293.15–313.15)K and atmospheric pressure. The results were used to calculate the excess molar volume, VmE, and deviation in isentropic compressibility, ΔκS, and correlated to the Redlich-Kister polynomial equation. N4Bu was synthesized by the method of acid-base neutralization reaction using n-butylamine and butanoic acid, and characterized using 1H NMR, 13C NMR and FTIR spectroscopy techniques. For all systems studied, the values of excess molar volumes and deviations in isentropic compressibility were negative over the entire composition range. The results obtained were discussed in terms of structural effects and intermolecular interactions between like and unlike molecules.

Volumetric and viscometric study with FT-IR analysis of binary systems with diethyl succinate and alcohols

Density, viscosity and refractive index of binary mixtures consisting of diethyl succinate+1-propanol, or +1-butanol, or +1-hexanol have been measured at atmospheric pressure and over the temperature range from 288.15K to 323.15K. Excess and deviation functions have been calculated from these data and fitted to the Redlich-Kister equation. The values of excess molar volume and deviation functions, with Fourier transform infrared (FT-IR) spectroscopy, were further used in the analysis of molecular interactions present in the mixture as well as the temperature influence on them.