Densities and viscosities of binary mixtures of {dimethylsulfoxide + aliphatic lower alkanols (C1–C3)} at temperatures from T = 303.15 K to T = 323.15 K

https://doi.org/10.1016/j.jct.2006.10.016Get rights and content

Abstract

Densities and viscosities for dimethylsulfoxide (DMSO) with methanol, ethanol, 1-propanol, and 2-propanol have been measured as a function of mole fraction at T = (303.15, 308.15, 313.15, 318.15, and 323.15) K and atmospheric pressure. From the measurements, excess molar volumes (VmE), excess viscosities (ηE), and Grunberg and Nissan interaction parameters (ε) have been calculated. The excess parameters are fitted to a Redlich–Kister equation. Excess molar volumes (VmE) are negative for (DMSO + methanol, + ethanol) systems throughout the whole range of composition. The (DMSO + 1-propanol) system shows both positive and negative excess molar volumes and (DMSO + 2-propanol) shows positive excess molar volume, hardly any negative value is observed in alcohol rich-region. The excess viscosities and interaction parameters of all the mixtures are negative except for the (DMSO + methanol) system which is positive.

Introduction

The properties of liquid mixtures have attracted much attention from both theoretical and practical points of view. Many engineering problems require quantitative data on the density and viscosity of liquid mixtures. It is also important for the calculation of the excess properties which capable one to make some understanding of the internal organization of the liquid phases.

The properties of dimethylsulfoxide (DMSO) have been the subject of considerable interest because of its wide range of applicability as a solvent in chemical and biological processes and a plasticizer. It is a highly polar self-associated [1], [2] liquid and has ability to participate in hydrogen bonding. The enhancement of its donor ability in solvent mixtures may result from rupture of the DMSO structure by the second liquid component. In liquid mixtures, therefore, the DMSO molecules would be less rigidly bound than in pure solvent and could interact better with the hydrogen bonded liquids. Alcohols, on the other hand, are strongly self-associated hydrogen bonded liquids. The investigation of the thermodynamic properties of the binary mixtures containing associated DMSO and alkanols can be, therefore, quite rewarding.

Over the last couple of decades, a large number of thermodynamic experimental results and theoretical investigations of mixtures containing DMSO has been devoted [3], [4], [5], [6], [7], [8], [9], [10], [11], [12]. Some investigators have presented the densities and viscosities for the mixtures of DMSO and higher alkanols or glycols at a particular temperature [5], [6], [10]. To the best of our knowledge, no volumetric and viscometric studies on the mixtures of DMSO and lower aliphatic alkanols at different temperatures are available. This prompted us to study the densities and viscosities of (DMSO + methanol, + ethanol, + 1-propanol, + 2-propanol) mixtures at ambient pressure and T = (303.15, 308.15, 313.15, 318.15, and 323.15) K over the entire range of composition.

Section snippets

Experimental

Methanol, ethanol, 1-propanol, and 2-propoanol used in the present investigation were the same as in our earlier works [13], [14]. DMSO purchased from Aldrich was refluxed over NaOH for three hours at 90 °C. Then it was distilled at reduced pressure and the middle fraction was collected. Chemicals were kept in sealed dark bottles dried over molecular sieves 4A 1/16 (Wako pure Chemical) for 2–3 weeks prior to their use to eliminate residual traces of water and avoid moisture gain. All of the

Results and discussion

The excess molar volumes,VmE, have been calculated by the following equation:VmE=[(x1M1+x2M2)/ρ12-(x1M1/ρ1+x2M2/ρ2)],where x1, M1 and ρ1 are the mole fraction, molar mass and density, respectively, of the pure DMSO, and x2, M2, ρ2 are the corresponding quantities for alkanol in each system. ρ12 is the density of the corresponding binary solution. The densities and excess molar volumes at T = (303.15, 308.15, 313.15, 318.15, and 323.15) K are presented in TABLE 2, TABLE 3, TABLE 4, TABLE 5 for the

References (39)

  • T. Kimura et al.

    Thermochim. Acta

    (2004)
  • H. Wang et al.

    J. Chem. Thermodyn.

    (2004)
  • G. Narayanaswamy et al.

    J. Chem. Thermodyn.

    (1980)
  • H. Wang et al.

    J. Chem. Thermodyn.

    (2004)
  • M.A. Saleh et al.

    J. Mol. Liq.

    (2004)
  • M.M.H. Bhuiyan et al.

    J. Chem. Thermodyn.

    (2004)
  • S.L. Oswal et al.

    Fluid Phase Equilibr.

    (1999)
  • H.A. Zarei

    J. Mol. Liq.

    (2006)
  • M.A. Chowdhury et al.

    J. Chem. Thermodyn.

    (2001)
  • J.B. Kinsinger et al.

    J. Phys. Chem.

    (1973)
  • H.H. Szmant
  • B.V.K. Naidu et al.

    J. Chem. Eng. Data

    (2002)
  • M.A. Saleh et al.

    J. Mol. Liq.

    (2002)
  • M.A. Saleh et al.

    Phys. Chem. Liq.

    (2001)
  • R.K. Dewan et al.

    J. Sol. Chem.

    (1989)
  • P.F. McGarry et al.

    J. Phys. Chem. A

    (1997)
  • K. Tamura et al.

    J. Chem. Eng. Data

    (2005)
  • K. Tamura et al.

    J. Sol. Chem.

    (1997)
  • S.B. Aznarez et al.

    J. Chem. Eng. Data

    (1993)
  • Cited by (0)

    View full text