Determination of Solubility Parameters for the p-Xylene Oxidation Products

Abstract

The Hildebrand solubility parameter (δ), which predicts the miscibility of materials, was determined for the compounds that are involved in the oxidation of p-xylene to terephthalic acid. The δ values were determined from the measured intrinsic viscosity [η] of the compounds. The following compounds (namely, methyl benzoate, p-tolualdehyde, 4-hydroxymethyltoluene, terephthalaldehyde, benzoic acid, p-toluic acid, 4-hydroxymethylbenzoic acid, phthalic acid, trimellitic acid, 4-carboxybenzaldehyde, and isophthalic acid, including p-xylene as the reactant and terephthalic acid as the main product) were studied. The predicted δ values were obtained using the group contribution method, which helped in selecting the solvents to be used for viscosity measurements. Mixtures of solvents were used to obtain δ values for phthalic acid, isophthalic acid, terephthalic acid, and trimellitic acid. It was observed that δ is apparently related to the melting points of the compounds. Three-dimensional Hansen solubility parameters were also determined for important p-xylene oxidation products for a better understanding of their solubility behavior.

Solvent optimization for bacterial extracellular matrices: a solution for the insoluble

“…Only ve of the twenty-three solvents achieved any biolm dissolution (Table S1 † provides for greatest dissolution. 46 [k H ] has also been found to decrease with increasing solvent power, 47 which supports the results from this study with [h max ] also corresponding to minima in [k H ] (Table 1). Thus, the ionic liquid or the ionic liquid-organic solvent blend that gives either the highest intrinsic viscosity or lowest [k H ] could be the best solvent for biolm dissolution.…”

Solubilities of Isophthalic Acid in Ternary Mixtures of Acetic Acid + Water + Benzoic Acid from 292.55 to 372.10 K

“…The Hildebrand solubility parameter (δ) is defined as the square root of the cohesive energy density, which could provide a numerical estimate of the degree of interaction between nonpolar materials and predict the miscibility of materials from the similarity of the parameters. , Since the solvents in this work were polar materials, the Hildebrand solubility parameter cannot be well applied to the systems. Hansen’s three-dimensional solubility parameters theory is applicative in this circumstance, which takes into account interactions such as dispersion, polarity, and hydrogen bonding.…”

“…In Table , the solubility parameters of pure materials IA, BA, water, and acetic acid were acquired from the relative literature, , while the Hansen parameters of acetic acid + water mixture solvents were calculated by eqs and . Likewise, the Hansen parameters of acetic acid + BA and acetic acid + water + BA mixtures were calculated, and the results were compared and shown in Figure .…”