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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 137, n. 6, p. 2017-2028, SEP 2019.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 14/21252-0 - Equilibrium and production processes of biofuels and bioproducts
• Grantee: Antonio José de Almeida Meirelles
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 10/18355-1 - STUDY OF SOLID-LIQUID EQUILIBRIUM IN MIXTURES OF ETHYL ESTERS
• Grantee: Maria Dolores Robustillo Fuentes
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/06956-2 - Solid-liquid equilibrium and flash point of mixtures of ethyl esters/biodiesel and representative compounds of jet fuel
• Grantee: Larissa Castello Branco Almeida Bessa
• Support Opportunities: Scholarships in Brazil - Post-Doctoral