The Ternary System (n-Heptane + Docosane + Tetracosane):  The Solubility of Mixtures of Docosane and Tetracosane in Heptane and Data on Solid−Liquid and Solid−Solid Equilibria in the Binary Subsystem (Docosane + Tetracosane)

Abstract

In this paper experimental data on the solid−liquid and solid−solid equilibria in the binary system (docosane + tetracosane) and solid solubility data in the ternary system (heptane + docosane + tetracosane) are presented. For 14 binary mixtures of the two heavy alkanes, DSC measurements were performed to detect the solid−liquid and solid−solid phase transition temperatures. Solid disappearance temperatures were measured for 14 mixtures of docosane and tetracosane dissolved in various quantities of heptane. The experimental results reveal that the solubility curves found in the ternary system correspond to the phase behavior of the binary subsystem studied. At low concentrations of heptane, probably almost ideally mixed crystals are in equilibrium with the liquid phase, while at high heptane concentrations, the solid−liquid equilibrium involves most likely different nonideal solid phases.

Solubility of Some n-Alkanes (C23, C25, C26, C28) in Heptane, Methylcyclohexane, and Toluene

“…Their results have been recently confirmed by Flöter et al, 1997. The aim of this work is to determine the solubility of tricosane (denoted C 23 ), pentacosane (denoted C 25 ), hexacosane (denoted C 26 ), and octacosane (denoted C 28 ) in heptane, methylcyclohexane, and toluene.…”

“…(ii) The solubility of heavy pure alkanes (Ghogomu et al, 1997a) and their binary mixtures in organic solvents (Ghogomu et al, 1989(Ghogomu et al, , 1997b. Their results have been recently confirmed by Flo ¨ter et al, 1997. The aim of this work is to determine the solubility of tricosane (denoted C 23 ), pentacosane (denoted C 25 ), hexacosane (denoted C 26 ), and octacosane (denoted C 28 ) in heptane, methylcyclohexane, and toluene.…”

Solid–Liquid Equilibria of Nine Binary Systems with Dicarboxylic Acids

“…Determination of phase boundaries of SLE is based on the measurements of both the peak temperatures and the heat of phase transformation . Results reported in literature include experimental SLE data on metal, polymer, and organic compound systems, all of which are obtained by using the DSC method. − Additionally, mathematical models used for correlating SLE results of dicarboxylic acids with binary mixtures from DSC experiments are also present in existing literature. − …”

Measurements and model prediction of the solid–liquid equilibria of organic binary mixtures

“…Besides the traditional technique of cooling curve and visual measurement (Jakob, Joh, Rose & Gmehling, 1995), the di!erential scanning calorimetry (DSC) method is also used in many experimental studies on metal, polymer and organic compounds (e.g. Smith & Pennings, 1974;Matsuoka & Ozawa, 1989;Frezzotti, Bonifaci, Cavalca, Malaguti & Ravanetti, 1993;Santilli, Filippis & Chianese, 1994;Hammami & Mehrotra, 1995;Floter, Hollanders, de Loos & de Swaan Arons, 1997). DSC provides a useful technique for determining the phase boundaries through the measurement of heat e!ect during the phase transformation process (Hammami & Mehrotra, 1992).…”