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  • Biodiesel production through esterification catalyzed by imidazolium based ionic liquids
    Publication . Belhaj, Ines; Queiroz, Ana; Ribeiro, António E.; Brito, Paulo; Mokkadem, Yassin
    Due to the massive use of energy from non-renewable sources, and the associated environmental problems, there is a need to find viable alternatives to their replacement. The production of biodiesel as a substitute for diesel is one of the alternatives found. Biodiesel consists of a mixture of, fatty acids methyl esters (FAMEs) and can be produced through two types of reactions: esterification of fatty acid mixtures and transesterification of vegetable oils and animal fats ; using conventional catalysts such as acids (sulfuric acid or sulfonic acid) or bases (sodium hydroxide or potassium hydroxide). Problems associated with the use of these catalysts have encouraged the search for more sustainable alternatives by introducing ionic liquids as catalysts because of their environmental and safety advantages and their recoverability and reuse. The main objective of this study was to evaluate the recoverability of the ionic liquid 1-methylimidazolium hydrogen sulfate [HMIM][HSO4] in the production of biodiesel through the esterification reaction of oleic acid in the presence of methanol at 4h, 65°C, with molar ratio methanol/oleic acid 1:10.The reaction yield was found to be 74% to 10% IL, 91% to 15% IL and 91% to 20% IL. These yields decreased to 44% (10% IL) with 4 cycles of recycling, 69% (15% IL) with 5 cycles of recycling and 69% (20% IL) with 4 cycles of recycling.
    2019Dissertação de mestrado Acesso aberto Ver mais