On the solid–liquid phase diagrams of binary mixtures of even saturated fatty alcohols: Systems exhibiting peritectic reaction

Carareto, Natália D.D.; Santos, A.O. dos; Rolemberg, Marlus Pinheiro; Cardoso, Lisandro Pavie; Costa, Mariana C.; Meirelles, Antônio José de Almeida

doi:10.1016/j.tca.2014.05.022

Cited by 29 publications

(22 citation statements)

References 44 publications

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“…In the heating process, the energy required for the eutectic reaction to occur is proportional to the amount of liquid formed in the mixture. Following these considerations, the Tamman's plot for a binary mixture must present a maximum at the eutectic composition and a minimum at the extremes of the phase diagram [41]. In a ternary system, the Tamman's diagram should be a 3D representation.…”

Section: Palmitate (3) Andmentioning

confidence: 99%

Solid-liquid equilibrium of binary and ternary systems formed by ethyl laurate, ethyl palmitate and dodecylcylohexane: Experimental data and thermodynamic modeling

Robustillo

Meirelles

Filho

2016

Fluid Phase Equilibria

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a b s t r a c tThe solideliquid equilibrium diagrams of binary and ternary mixtures formed by dodecylcyclohexane and the fatty acid esters ethyl laurate and ethyl palmitate was determined herein. The liquidus and solidus lines were obtained through differential scanning calorimetry. The thermograms of pure compounds were resolved into the corresponding overlapping peak components by a fitting analysis, allowing a better estimation of phase-change properties of polymorphs. All binary systems show immiscibility in the solid phase, although those containing dodecylcyclohexane present small regions of partial miscibility. The system formed by ethyl palmitate and dodecylcyclohexane presents a peritectic transition, which was also observed in the ternary system. The thermodynamic modeling was conducted using different models for liquid-phase non-ideality and considering different polymorphs in solid phase. The modeling shows that a probable inversion of polymorphs relative stability occurs for the binary system formed by ethyl laurate and dodecylcyclohexane. The results from this work may contribute to enhancing the understanding and description of the complex behavior of biodiesel/diesel mixtures at low temperatures.

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Section: Palmitate (3) Andmentioning

confidence: 99%

Solid-liquid equilibrium of binary and ternary systems formed by ethyl laurate, ethyl palmitate and dodecylcylohexane: Experimental data and thermodynamic modeling

Robustillo

Meirelles

Filho

2016

Fluid Phase Equilibria

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“…Fatty acids, alcohols, and esters are identified by presenting a melting profile characterized by one single thermal transition, i.e., a simple solid–liquid transition, or, depending on the size of the carbon chain, one polymorphic transition very close to the T m (Cedeño et al, ; Domalski and Hearing, ; Mosselman et al, ; Ventolá et al, ). However, mixtures of fatty esters and fatty alcohols can present other thermal events, which are called peritectic transitions (Carareto et al, ; Costa et al, , ). These transitions occur when a mixture of compounds establishes a new crystal ensemble that alters the melting behavior of the system.…”

Section: Resultsmentioning

confidence: 99%

Carnauba Wax Particles: Investigation of Dripping and Cold‐Extrusion Processes

Paulo

Schmiele

Máximo

et al. 2019

J Americ Oil Chem Soc

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Solid lipids are commonly used as carrier systems for encapsulation processes. However, formulations containing only solid lipids tend to form a highly ordered crystal lattice, which can expel the active compound during long-term storage, due to the dynamics of polymorphic transitions. Regarding the aspects of particle production, the cooling step of the melted lipid is essential for determining the type of formed crystals. This work aimed to analyze the effects of the crystallization step on the physicochemical properties of lipid particles. Carnauba wax (CW) particles with a relatively high melting point (T m = 78 C) were produced by the dripping method, based on melting-crystallization steps, and by cold extrusion, which uses temperatures lower than the melting point of the lipid. Then, the physical properties, thermal behavior, and X-ray of CW particles were analyzed. The particles obtained by dripping and extrusion presented mean sizes of 3.7 and 1.5 mm, respectively. All particles presented a similar thermal behavior (T m = 78 C; ΔH = 200 J g −1 ) and crystalline arrangement of the lipids. However, the dripping system presented an operational problem of clogging, requiring efficient thermal insulation, whereas the extrusion is a cost-effective, time-saving, and eco-friendly method.

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“…The transition at the highest temperature determines the final of the melting process, corresponding to the liquidus line. The liquidus line is the locus of the boundary between the area of a single liquid phase and the areas where solid and liquid coexist . The other transition, which occurs at a lower and constant temperature of approximately 256.2 K, is related to the eutectic transition.…”

Section: Resultsmentioning

confidence: 99%

Influence of Additives (Isoamyl Laurate or Isoamyl Nonanoate) in the Solid–Liquid Equilibrium of Fatty Acid Ethyl Esters

et al. 2019

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Solid–liquid equilibrium data of binary mixtures of fatty acid ethyl esters present in biodiesel, namely, ethyl laurate, ethyl palmitate, ethyl myristate, ethyl stearate, and ethyl oleate, and fatty esters of branched-chain alcohols used as additives (isoamyl laurate and isoamyl nonanoate) were obtained through differential scanning calorimetry. Most of these systems presented eutectic behavior, except for the system ethyl laurate + isoamyl laurate, which presented peritectic transition. Equilibrium data were thermodynamically modeled either using two different liquid-phase activity coefficient models or considering that the liquid phase is an ideal mixture. Best correlations were observed for the Flory–Huggins equation, but good agreement between calculated and experimental data was also obtained when using both the ideal and UNIFAC–Dortmund models.

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On the solid–liquid phase diagrams of binary mixtures of even saturated fatty alcohols: Systems exhibiting peritectic reaction

Cited by 29 publications

References 44 publications

Solid-liquid equilibrium of binary and ternary systems formed by ethyl laurate, ethyl palmitate and dodecylcylohexane: Experimental data and thermodynamic modeling

Solid-liquid equilibrium of binary and ternary systems formed by ethyl laurate, ethyl palmitate and dodecylcylohexane: Experimental data and thermodynamic modeling

Carnauba Wax Particles: Investigation of Dripping and Cold‐Extrusion Processes

Influence of Additives (Isoamyl Laurate or Isoamyl Nonanoate) in the Solid–Liquid Equilibrium of Fatty Acid Ethyl Esters

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