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Binary Mixtures' Thermophysical Properties Study of Novel Ionic Liquids Incorporating Thiosalicylate Anion

Mustafa, Fadwa Babiker (2010) Binary Mixtures' Thermophysical Properties Study of Novel Ionic Liquids Incorporating Thiosalicylate Anion. Universiti Teknologi PETRONAS. (Unpublished)

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Ionic liquids are a class of organic molten salts "designer solvents" that are composed totally of anions (inorganic poly-atomic parts e.g., tetrafluoroborate [BF4]") and organic cations (e.g., l-butyl-3-methylimidazolium - [BMIM]. Among the several aspects of green chemistry, the reduction/replacement of volatile organic solvents from the reaction medium is of utmost importance since the use of a large excess of conventional volatile solvents required to conduct a chemical reaction creates ecological and economic concerns. This research looks at producing a new cluster of ionic liquids which have the same anion part of thiosalicylate [C6H4SHCOO]" with various cations of choline, tetramethylamonium, methylimidazolium and pyridinium which the lattertwo differ on the chain length. The chemical and physical properties such as the thermophysical properties of density, viscosity and refractive index for the pure ionic liquids and chiefly the density and viscosity for their binary systems with water are examined. From experimental data the molecular volume (Fm), thermal expansion coefficient (aP), standard entropy (S°) and crystal energy (Upot) which are considered as derived thermophysical properties are studied for the pure ionic liquids particularly room temperature ionic liquids (RTILs). From the Thermal Gravimetric Analysis (TGA) the decomposition temperature for 1- octyl-3-methylimidazolium thiosalicylate, l-butyl-3-methylimidazolium thiosalicylate, choline thiosalicyalte, tetra-methylammonium thiosalicylate and 1-octylpyridinium thiosalicylate as 212.02 °C, 253.2 °C, 195.34°C, 225.05 °C and 235.1 °C respectively. Based on the experiemental data the crystal energy for l-octyl-3-methylimidazolium thiosalicylate, 1-octylpyridinium thiosalicylate and choline thiosalicyalte were calculated in respect to their densities at 25 °C to be 399.6 , 396.9 and 450.2 kj correspondingly. The dissertation included the synthesis methodology for thiosalicylate ionic liquids, characterization of the pure ionic liquids and their binary mixtures such as densities and viscosities, proton Nuclear Magnetic Resonance analysis (]HNMR) and the derived thermo physical properties data for pure ionic liquids.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Separation Process
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 22 Oct 2013 12:10
Last Modified: 22 Oct 2013 12:10
URI: http://utpedia.utp.edu.my/id/eprint/9416

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