Solid-liquid phase equilibrium diagrams of binary mixtures containing fatty acids, fatty alcohol compounds, and tristearin

Autor(es)

Pelaquim, Fernanda Paludetto ; de Matos, Flavio Cardoso ; Caldas Batista, Eduardo Augusto ; de Almeida Meirelles, Antonio Jose ; da Costa, Mariana Conceicao

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Chemical Engineering; v. 40, n. 1, p. 18-pg., 2022-03-14.

Resumo

Fatty compounds have significant industrial applications as coatings, plastics, cleaning products, emulsifiers, structuring, and gelling agents. Due to these applications, it is important to understand their physical and chemical properties, such as melting behavior, crystallization processes, and phase transitions, all of them related to solid-liquid equilibrium (SLE). In this study, six binary mixtures composed of tristearin (SSS) plus fatty acids (capric acid, lauric acid, and myristic acid) and tristearin plus fatty alcohol compounds (1-decanol, 1-dodecanol, and 1-tetradecanol) were investigated using Differential Scanning Calorimetry (DSC) and optical microscopy analysis. The phase diagrams formed by tristearin + fatty acids presented a monotectic behavior and the phase diagrams formed by tristearin + fatty alcohol compounds, on the other hand, exhibited a solid solution formation on the entire composition range, although the liquidus line shape was very similar to that observed in the systems formed by fatty acids. The liquidus line of all systems were well-described by NRTL and three-suffix Margules models, and also by ideal assumption. The best result was observed for the three-suffix Margules model, with a root mean square deviation (RMSD) equal to 0.26. (AU)

• Processo FAPESP: 18/19198-9 - Determinação de dados de solubilidade de gases leves em Deep eutectic solvents a altas pressões
• Beneficiário: Fernanda Paludetto Pelaquim
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/21252-0 - Equilíbrio e processos de produção de biocombustíveis e bioprodutos
• Beneficiário: Antonio José de Almeida Meirelles
• Modalidade de apoio: Auxílio à Pesquisa - Temático