Determination of physicochemical properties of some fatty acid methyl esters by gas liquid chromatography

Abstract

Physicochemical data such as vapor pressures (p0), heats of vaporization (ΔHv), activity coefficents at infinite dilution (γ∞) and excess partial molar entropy (ΔSe0) are considered important for conducting unit processes and designing reactor equipment. Scanty information regarding such data is available in the literature for the higher fatty acid methyl esters. The objective of this research was to determine the physicochemical properties of higher fatty acid methyl esters (C11–C23) by a gas‐liquid chromatographic technique with SE‐30 and diethylene glycol adipate as stationary phases. Correlations between carbon numbers and various thermodynamic properties have indicated definite trends, which could be useful in predicting the properties of unknown fatty acid methyl esters. The data generated may be useful to chemical engineers in the construction of storage tanks, solvent extractors and distillation columns.

Liquid–vapour equilibria of the methyl esters of alkanoic acids: vapour pressures as a function of temperature and standard thermodynamic function changes

“…1-2, along with data from other sources. The latter are by Stage [8]; Rose and Supina [9]; Bonhorst et al [10]; Jantzen and Witgert [11]; Rose et al [12]; Scott et al [13]; Husain et al [14]; Spizzichino [15]; Norris and Terry [16]; Althouse and Triebold [17]; and Baccanari et al [18]. Table 3 Vapour pressure data [1], and spinning rotor manometry …”

The relationship between vapour pressure, vaporization enthalpy, and enthalpy of transfer from solution to gas: An extension of the Martin equation

“…Data support of equation (11) are voluminous [11,14] and figure 1 is the demonstration graph of this relation.…”

“…Numbers in parenthesis are the differences between values obtained from the literature and predicted values ðp iðlitÞ À p iðcalÞ Þ[11].…”

“…Plot of vapour pressure against reciprocal temperature for fatty acid methyl esters[11]: j, for C10; m, for C12; r, for C14; and ·, for C16.…”

Heats of vaporization of then‐fatty acid esters

“…Although both the n-fatty acid esters and heats of vaporization (Hv) are important (1,2), many of the published H v and HvM values (M, molecular weight) disagree widely with each other (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). The present paper reports work on H v (at 25°C and at boiling points), boiling points, densities, and molar volumes of the n-fatty acid methyl and ethyl esters and n-alkyl acetates, but H v of the methyl esters (at 25°C) and efforts to evaluate their accuracy received most attention.…”