The solid–liquid phase diagrams of binary mixtures of even saturated fatty acids differing by six carbon atoms

Costa, Mariana C.; Rolemberg, Marlus Pinheiro; Meirelles, Antônio José de Almeida; Coutinho, João A. P.; Krähenbühl, Maria Alvina

doi:10.1016/j.tca.2009.06.018

Cited by 61 publications

(46 citation statements)

References 25 publications

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“…The mixtures, with a total weight of approximately 1 g, were prepared on an analytical balance (Adam AAA/L) with an accuracy of ( 0.2 mg as described in detail elsewhere. [8][9][10] This experimental procedure allows an appropriate homogenization of the liquid mixture after the complete melting of its components and also avoids oxidation by excessive heating. 10 Differential Scanning Calorimetry (DSC).…”

Section: Methodsmentioning

confidence: 99%

Solid−Liquid Equilibrium of Tristearin with Refined Rice Bran and Palm Oils

et al. 2010

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In the present study, phase diagrams of two systems, formed by tristearin (1,3-di(octadecanoyloxy)propan2yl octadecanoate) with refined rice bran oil or refined palm oil, were obtained by Differential Scanning Calorimetry (DSC) and reported in the literature for the first time. The X-ray diffraction technique was employed to verify the crystallization behavior of the individual components and for the mixture tristearin plus refined palm oil. The UNIFAC model was successfully used to predict the liquidus line of these systems, with a root-mean-square deviation between the experimental and calculated melting temperatures below 1.3 %.

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Section: Methodsmentioning

confidence: 99%

Solid−Liquid Equilibrium of Tristearin with Refined Rice Bran and Palm Oils

et al. 2010

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“…On the right part of the phase diagram of the phase diagram, a transition is detected around 56.7 °C. This latter would most likely be a metatectic one given the overall shape of the phase diagram and considering results found in literature for other fatty acids' binary systems [15,25,26]. The presence of a metatectic transition implies the existence of a solid solubility domain.…”

Section: Resultsmentioning

confidence: 59%

Phase Diagrams of Fatty Acids as Biosourced Phase Change Materials for Thermal Energy Storage

et al. 2019

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Featured Application: A potential application of this work consists of accelerating the screening step required for the study and selection of promising binary systems of phase change materials for thermal energy storage at medium temperature. Abstract: Thermal energy storage is known as a key element to optimize the use of renewable energies and to improve building performances. Phase change materials (PCMs) derived from wastes or by-products of plant or animal oil origins are low-cost biosourced PCMs and are composed of more than 75% of fatty acids. They present paraffin-like storage properties and melting temperatures ranging from −23 • C to 78 • C. Therefore, they could be appropriate for latent heat storage technologies for building applications. Although already studied, a more detailed exploration of this class of PCMs is still required. In this frame, a screening of fatty acids and of their related binary systems must be performed. The infrared thermography method (IRT), already used for the fast estimation of simple phase diagrams (~2 h), appears to be best suited to achieve this goal. IRT method applicability to the more complex fatty acids phase diagrams is hence studied in this work. A phase diagram comprising more than a hundred data sets was obtained for the palmitic acid-stearic acid binary system. The reliability of the results is assessed by comparison to differential scanning calorimetry (DSC) measurements or results from other standard methods presented in literature and to a solid-liquid equilibrium thermodynamic model.

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“…According to literature [37] the Tammann plot should present a linearly increasing value as a function of the mixture composition up to reaching the eutectic point and, after that, it should decrease also linearly up to reaching the pure component composition forming a perfect triangle. The triangle shape will always be obtained even if the phase diagram shows the formation of a solid solution in its extremes, but in this case, it does not start at the pure component composition [13,22]. An exception to this behavior is found when the eutectic point is very close to the pure component concentration, in this case, the task of determine the eutectic composition becomes very difficult due to peak overlapping.…”

Section: Resultsmentioning

confidence: 98%