(Solid plus liquid) equilibrium of binary mixtures containing ethyl esters and p-xylene by differential scanning calorimetry

Autor(es)

Branco Almeida Bessa, Larissa Castello ^[1] ; Robustillo, Maria Dolores ^[1] ; de Almeida Meirelles, Antonio Jose ^[2] ; Pessoa Filho, Pedro de Alcantara ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Engn Sch, Dept Chem Engn, Caixa Postal 61548, BR-05424970 Sao Paulo, SP - Brazil

^[2] Univ Campinas UNICAMP, Sch Food Engn FEA, Dept Food Engn DEA, Rua Monteiro Lobato 80, BR-13083862 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 137, n. 6, p. 2017-2028, SEP 2019.
• Citações Web of Science: 0

Resumo

Current concerns regarding the environmental and economic sustainability of petroleum-based transportation fuels, including jet fuel, are driving interest into alternative fuels. To study the feasibility of using biodiesel in aviation engines, a deeper knowledge on solid-liquid equilibrium (SLE) of biodiesel/jet fuel blends is required. This work presents SLE data of binary mixtures containing p-xylene, a representative compound of aviation fuel, and fatty esters present in ethylic biodiesel. Experimental data were obtained through differential scanning calorimetry. A simple eutectic behavior was observed for all binary systems, although small regions of partial miscibility are also present. Observed eutectic temperature and composition (ethyl ester mole fraction) are 259.0 K and 0.45, 269.0 K and 0.32, 275.5 K and 0.22, 280.0 K and 0.15, and 247.7 K and 0.58 for systems containing ethyl laurate, ethyl myristate, ethyl palmitate, ethyl stearate and ethyl oleate, respectively. Good agreement was obtained between experimental and calculated data when using UNIFAC (Dortmund) model or Flory-Huggins equation, with root-mean-square deviations ranging from 0.47 to 1.90 K. The systems exhibit significant deviations from ideality, which cannot be neglected in model calculations. (AU)

• 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
• Processo FAPESP: 10/18355-1 - Estudo do equilíbrio sólido-líquido de misturas de ésteres etílicos
• Beneficiário: Maria Dolores Robustillo Fuentes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/06956-2 - Estudo do Equilibrio Sólido-Líquido e ponto de fulgor de Misturas de Ésteres Etílicos/Biodiesel e compostos presentes no combustível de aviação
• Beneficiário: Larissa Castello Branco Almeida Bessa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado