Thermodynamic behaviour and physicochemical characteristics of EG, DEG, TEG in aqueous gluconolactone solutions

The current study offers a blend of volumetric and acoustic approaches to examine the interlinkage between homologous series of glycol molecules (ethylene glycol (EG), diethylene glycol (DEG) and triethylene glycol (TEG)) in aqueous gluconolactone mixtures. As a function of gluconolactone concentration (0.00, 0.01, 0.02 and 0.03) mol Kg − 1 , the densities and sound velocity of taken ternary mixes of (water + gluconolactone + EG/DEG/TEG) were calculated at 288.15, 298.15, 308.15 and 318.15 K by means of Anton Paar DSA 5000 M. Utilizing the experimental values of density various volumetric properties such as apparent molar volume ( V ϕ ) , partial molar volume ( V ϕ 0 ) , partial molar volume of transfer ( Δ V ϕ 0 ) were calculated, and various acoustic parameters such as apparent molar isentropic compression ( K ϕ , S ) , partial molar isentropic compression ( K ϕ , S 0 ) , partial molar isentropic compression of transfer ( Δ K ϕ , S 0 ) was estimated. In addition to this the partial molar expansibility ( E ϕ 0 ) , its first-order derivative ∂ E ϕ 0 / ∂ T P and pair-triplet interaction coefficients ( V AB , K AB , V ABB , K ABB ) were also found. The outcome is depicted in terms of mixture interactions and dominant interactions (solute–solvent) along with the estimation of structure-making/structure-breaking tendency of glycols in aqueous gluconolactone solutions. Graphical abstract