Hydroesterification of Used Cooking Oil with Subcritical Water and Supercritical Ethanol for Biodiesel Production

Authors

DOI:

https://doi.org/10.53591/easi.v2i2.2536

Keywords:

Hydroesterification, Hydrolysis, Esterification, Supercritical ethanol

Abstract

The objective of this study was to determine the best combination of experimental factors of temperature and reaction time for the two-step hydroesterification reaction (hydrolysis and esterification) of used cooking oil with subcritical water and supercritical ethanol to maximize the production of fatty acid ethyl esters (biodiesel). The used oil (raw material of the process) was characterized by means of physicochemical tests applicable to oils and fats of animal and vegetable origin. The hydrolysis reaction was carried out with a 3x3 factorial experimental design in temperature and time (250, 275 and 300 °C for 20, 40 and 60 minutes), with a constant volumetric ratio water - oil 1:1. Free fatty acids were separated from glycerin, esterified with supercritical ethanol based on a 3x3 factorial experimental design in temperature and time (250, 300 and 350 ° C for 10, 20 and 30 minutes) keeping constant the pressure of the reaction medium at 10 MPa and the molar ratio of ethanol - free fatty acids 10:1. The percent free fatty acid conversion of the hydrolysis reaction and the percent conversion of the esterification reaction were determined by potentiometric titration. 98 % hydrolysis conversion was obtained after 40 min reaction at 300 °C and 95 % esterification conversion was obtained after 20 min reaction at 300 °C.

Author Biographies

Walter Quiroga Pérez, Escuela Politécnica Nacional, Quito, Ecuador

Ingeniero Químico por la Escuela Politécnica Nacional (2019). Máster en gestión ambiental y energética por la Universidad Internacional de la Rioja y maestrante de economía circular en la Pontificia Universidad Católica del Ecuador. Se desempeña actualmente como coordinador técnico en PECS Ambiente y Sostenibilidad, especialista en la gestión de desechos peligrosos y economía circular.  

Liliana Guzmán Beckman, Escuela Politécnica Nacional, Quito, Ecuador

Ingeniera Química de la Escuela Politécnica Nacional (EPN) en el 2003. Máster en Diseño de Procesos, Universidad Central del Ecuador. Ingeniera de campo de registros eléctricos en pozos en perforación y en producción de petróleo, Baker Hughes. Gerente de Logística y Procesos para trazar el combustible ecuatoriano para prevenir y controlar el contrabando y desvío de derivados del petróleo, Decipher C.A. Actualmente, profesora del Departamento de Ingeniería Química de la EPN, investiga temas relacionados con petróleo, derivados del petróleo y biocombustibles.

Andrés Chico Proaño , Escuela Politécnica Nacional, Quito, Ecuador

Chemical Engineer from Escuela Politécnica Nacional. Master of Science in Process and Environmental Systems Engineering from the University of Surrey, UK and PhD in Chemical Engineering from University College of London, UK. His research areas are biomass thermochemical process modeling, waste-to-energy applications and chemical process design and optimization. Currently, he is a lecturer in the Department of Chemical Engineering at EPN.

Emerson Reyes Narváez, Escuela Politécnica Nacional, Quito, Ecuador

Emerson Reyes Narváez

Testing Laboratory Analyst

Escuela Politécnica Nacional

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Additional Files

Published

2023-12-23

How to Cite

Quiroga Pérez, W. ., Guzmán Beckman, L., Chico Proaño , A. ., & Reyes Narváez, E. (2023). Hydroesterification of Used Cooking Oil with Subcritical Water and Supercritical Ethanol for Biodiesel Production . EASI: Engineering and Applied Sciences in Industry, 2(2), 29–40. https://doi.org/10.53591/easi.v2i2.2536

Issue

Vol. 2 No. 2 (2023): Energy efficiency and sustainability (special issue)

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Articles

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Copyright (c) 2023 Emerson Reyes Narváez, Liliana Guzmán Beckman, Walter Quiroga Pérez, Andrés Chico Proaño

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