Viscometric Properties of Binary Mixtures of Tetrahydrofuran + 2–Alkoxyethanols at Temperatures of (293.15, 298.15 & 303.15) K
- December 21, 2020
- Posted by: RSIS Team
- Categories: Chemistry, IJRIAS
International Journal of Research and Innovation in Applied Science (IJRIAS) | Volume V, Issue XII, December 2020 | ISSN 2454–6186
Ayasen Jermaine Kemeakegha 1* & Amabibi Benjamin Jumbo2
1*Department of Chemical Sciences, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria
2Department of Chemistry, Bayelsa Medical University, Yenagoa, Bayelsa State, Nigeria.
ABSTRACT
Viscosities (η) of pure liquids and binary mixtures of tetrahydrofuran (THF) with 2-methoxyethanol (2-ME), 2-ethoxyethanol (2-EE) and 2-butoxyethanol (2-BE) have been determined over the entire range of solvent composition at (293.15, 298.15 and 303.15) K. Absolute viscosities were determined by measuring the flow times of the liquids using an Ostwald type viscometer immersed in a thermostated water bath. From the experimental results, the excess viscosity (ηE) and excess Gibbs free energy of activation of viscous flow (ΔG*E) have been derived and presented as functions of composition. Excess viscosities showed both positive and negative deviations from linearity, suggesting the existence of strong intermolecular interactions where positive deviations prevails, and the dominance of disruptive effects of solvent structures, where negative deviations are dominant. Several viscosity correlation models were used to correlate and interpret the viscosity data. The Grunberg-Nissan (G-N), Hind and Ubbelohde (H-U), Katti and Chaudhary (K-C), Heric-Brewer (H-B)and Frenkel (F)models were used to analyze the viscosity result for the interpretation of molecular interactions in the solvent systems. The interaction parameters: d12, H12, K12, Δ12 and F12derived from these models served as further proof of the nature, extent and strength of interactions present in the binary mixtures. The predictive abilities of these models have also been tested, with the deviations from the experimental values expressed as average percentage deviations (APD).
KEY WORDS: Tetrahydrofuran, alkoxyethanols, molecular interactions, excess viscosity, excess Gibbs free energy
INTRODUCTION
We have been investigating the mixing behaviour of binary mixtures of C4 aliphatic ethers and (C1 – C4) alkoxyethanols at different temperatures. Earlier, we reported the results of our studies on the volumetric properties of mixtures of tetrahydrofuran (THF) with selected alkoxyethanols at (293.15, 298.15 and 303.15) K (Jumbo, et al, 2019)1. From the study, it was observed that strong intermolecular interactions through extensive network of hydrogen bonding existed between the components of the mixtures.
