Apparent molar properties of glycols in methanol solutions of propyl 4-hydroxybenzoate (propylparaben) at T = (293.15 to 308.15) K: an acoustic and volumetric approach

ABSTRACT

In the present investigation, densities and sound velocity of ethylene glycol and propylene glycol in the methanol solutions of propyl 4-hydroxybenzoate have been measured at different temperature and p = 0.1 MPa experimental pressure. Apparent molar volume ($V_{\varphi }$) and apparent molar isentropic compression ($K_{\varphi ,s}$) have been determined from the experimentally computed density and sound velocity data. The information about limiting apparent molar volume ($V_{\varphi }^0$) and limiting apparent isentropic compression ($K_{\varphi ,s}^0$) and their respective empirical parameters such as S_v and S_k have been evaluated for each ternary mixture at working temperatures. The values of $V_{\varphi }^0$ were computed to enlighten the intermolecular (solute–solvent, solute–solute and solvent–solvent) interactions present in the solution mixture, and ($V_{\varphi }^0$) values increase with rise in the temperature for all ternary system of present work. The $K_{\varphi ,s}^0$ shows the negative value due to pre-eminence of solute intrinsic effect over solvent intrinsic compressibility.

KEYWORDS:

• Propylparaben
• methanol
• ethylene glycol
• propylene glycol
• apparent molar volume
• isentropic compressibility

Acknowledgements

The authors are thankful to the authorities for providing necessary laboratory facilities to carry out the research work.

Disclosure statement

No potential conflict of interest was reported by the authors.

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