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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Tunable Hydrophobic Eutectic Solvents Based on Terpenes and Monocarboxylic Acids

Texto completo
Autor(es):
Martins, Monia A. R. [1, 2, 3, 4] ; Crespo, Emanuel A. [2, 5] ; Pontes, Paula V. A. [1] ; Silva, Liliana P. [2] ; Buelow, Mark [5] ; Maximo, Guilherme J. [1] ; Batista, Eduardo A. C. [1] ; Held, Christoph [5] ; Pinho, Simao P. [3, 4] ; Coutinho, Joao A. P. [2]
Número total de Autores: 10
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Fac Food Engn, BR-13083862 Campinas, SP - Brazil
[2] Univ Aveiro, Dept Chem, Aveiro Inst Mat, CICECO, P-3810193 Aveiro - Portugal
[3] Polytech Inst Braganca, Dept Chem & Biol Technol, Associate Lab LSRE LCM, P-5300253 Braganca - Portugal
[4] Polytech Inst Braganca, Mt Res Ctr CIMO, P-5301855 Braganca - Portugal
[5] TU Dortmund, Dept Biochem & Chem Engn, Lab Thermodynam, D-44227 Dortmund - Germany
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 6, n. 7, p. 8836-8846, JUL 2018.
Citações Web of Science: 27
Resumo

Recently, some works claim that hydrophobic deep eutectic solvents could be prepared based on menthol and monocarboxylic acids. Despite of some promising potential applications, these systems were poorly understood, and this work addresses this issue. Here, the characterization of eutectic solvents composed of the terpenes thymol or L(-)-menthol and monocarboxylic acids is studied aiming the design of these solvents. Their solid-liquid phase diagrams were measured by differential scanning calorimetry in the whole composition range, showing that a broader composition range, and not only fixed stoichiometric proportions, can be used as solvents at low temperatures. Additionally, solvent densities and viscosities close to the eutectic compositions were measured, showing low viscosity and lower density than water. The solvatochromic parameters at the eutectic composition were also investigated aiming at better understanding their polarity. The high acidity is mainly provided by the presence of thymol in the mixture, while L(-)-menthol plays the major role on the hydrogen-bond basicity. The measured mutual solubilities with water attest to the hydrophobic character of the mixtures investigated. The experimental solid-liquid phase diagrams were described using the PC-SAFT equation of state that is shown to accurately describe the experimental data and quantify the small deviations from ideality. (AU)

Processo FAPESP: 14/21252-0 - Equilíbrio e processos de produção de biocombustíveis e bioprodutos
Beneficiário:Antonio José de Almeida Meirelles
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 16/08566-1 - Termodinâmica do equilíbrio de fases para o melhoramento das propriedades físicas de bioprodutos alimentícios e sua predição em processos industriais e digestivos
Beneficiário:Guilherme José Maximo
Linha de fomento: Auxílio à Pesquisa - Regular