Upgrading/Deacidification of Bio-Oils by Liquid–Liquid Extraction Using Aqueous Methanol as a Solvent

Nélio Teixeira Machado, Silvio Alex Pereira da Mota, Raquel Ana Capela Leão, Rodrigo Octavio Mendonça Alves de Souza, Sergio Duvoisin Junior, Luiz Eduardo Pizarro Borges and Andréia de Andrade Mancio da Mota ()
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Nélio Teixeira Machado: Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, PA, Brazil
Silvio Alex Pereira da Mota: Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, PA, Brazil
Raquel Ana Capela Leão: Laboratory of Biocatalysis and Organic Synthesis, Institute of Chemistry, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos, N° 149, Bloco A 622, Rio de Janeiro 21941-909, RJ, Brazil
Rodrigo Octavio Mendonça Alves de Souza: Laboratory of Biocatalysis and Organic Synthesis, Institute of Chemistry, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos, N° 149, Bloco A 622, Rio de Janeiro 21941-909, RJ, Brazil
Sergio Duvoisin Junior: Faculty of Chemical Engineering, Universidade do Estado do Amazonas-UEA, Avenida Darcy Vargas N° 1200, Manaus 69050-020, AM, Brazil
Luiz Eduardo Pizarro Borges: Laboratory of Catalyst Preparation and Catalytic Cracking, Section of Chemical Engineering-IME, Praça General Tibúrcio N° 80, Rio de Janeiro 22290-270, RJ, Brazil
Andréia de Andrade Mancio da Mota: Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, PA, Brazil

Energies, 2024, vol. 17, issue 11, 1-25

Abstract: Oxygenated compounds such as acids in bio-oils (BO) have been related to the corrosion of metals and their storage instability when applied as fuels. Therefore, upgrading BO by removing acids (deacidification) can be a valuable technique to reduce corrosivity using specific separation processes. Therefore, the objective of this paper was to evaluate the effect of the water content in the solvent (aqueous methanol), the carboxylic acid content in the BO and extraction temperature on the deacidification process by liquid–liquid extraction (LLE), as well as the effect of the same parameters on the quality of the deacidified BO through physical–chemical and GC-MS analyses. The results show that an increase in the water content (5 to 25%) in the solvent and an increase in the carboxylic acids content (24.38 to 51.56 mg KOH/g) in the BO reduce the solvent’s capacity to extract carboxylic acids while increasing the temperature (25 to 35 °C) of the deacidification process promoted an increase in its capacity to remove them. Consequently, the highest deacidification efficiency (72.65%) is achieved with 5% water in methanol at 25 °C for BO 1 (TAN = 24.38 mg KOH/g). Therefore, the deacidification process through LLE using aqueous methanol contributed significantly to BO upgrading.

Keywords: solvent extraction; liquid–liquid extraction; biofuel; pyrolysis oil; carboxylic acids; oxygenated compounds (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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