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Ionic liquids in the fractionation of terpenes and other relevant separation problems

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Resumo:Terpenes include a great variety of compounds with different functions, some acting as flavoring or aroma agents, or organic solvents, while others can be used as raw material for the synthesis of other compounds of commercial interest in different industrial areas. With an increase in environmental concern, some terpenes can represent greener options for industrial processes, increasing the interest of the scientific community on its properties and behavior. In order to purify those compounds and their mixtures, and therefore increase their value, various methods are applied. Among those methods, vacuum distillation has been widely applied. Furthermore, studies associating with ionic liquids (ILs) as separation agents in deterpenation processes hold economical and environment appeal. In the present work, infinite dilution activity coefficient data of several organic solutes (alkanes, cycloalkanes, ketones, ethers, cycloethers, aromatic hydrocarbons, esters, acetonitrile, pyridine, thiophene, alcohols, terpenes and terpenoids) and water in selected ionic liquids ([P6,6,6,14][(C8H17)2PO2] or [P6,6,6,14][Cl]) were obtained by gas-liquid chromatography (GLC), aiming to estimate selectivities and capacities values related to different separation problems including those involving terpenes mixtures. Both ILs tested showed poor entrainment potential regarding the α-pinene/β-pinene separation, while [P6,6,6,14][(C8H17)2PO2] showed potential as an entrainer in the limonene/linalool separation. The partial excess energies of alcoholic solutes showed the most distinct behavior from all solutes in both ILs, indicating to be mostly governed by enthalpic interactions.
Autores principais:Santos, Gabriel Teixeira
Assunto:Gas-liquid chromatography Deterpenation Ionic liquid Selectivity Capacity
Ano:2020
País:Portugal
Tipo de documento:dissertação de mestrado
Tipo de acesso:acesso aberto
Instituição associada:Instituto Politécnico de Bragança
Idioma:inglês
Origem:Biblioteca Digital do IPB

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