UPM Institutional Repository

Comparative study of the methanolysis and ethanolysis of maize oils using alkaline catalysts


Rashid, Umer and Ibrahim, M. and Ali, S. and Adil, M. and Hina, Saira and Bukhari, Iftikhar Hussain and Yunus, Robiah (2012) Comparative study of the methanolysis and ethanolysis of maize oils using alkaline catalysts. Grasas y Aceites, 63 (1). pp. 35-43. ISSN 0017-3495; ESSN: 1988-4214


With an increasing population and economic development, fuel from renewable resources needs to be widely explored in order to fulfill the future energy demand. In the present study, biodiesel from maize oil using transesterification reactions with methanol and ethanol was evaluated in the presence of NaOCH3, KOCH3, NaOCH2CH3, KOCH2CH3, NaOH and KOH as catalysts. The influence of reaction variables such as the alcohol to oil molar ratio (3:1-15:1), catalyst concentration (0.25-1.50%) and reaction time (20-120 min) to achieve the maximum yield was determined at fixed reaction temperatures. The optimized variables in the case of methanolysis were 6:1 methanol to oil molar ratio (mol/ mol), 0.75% sodium methoxide concentration (wt%) and 90 min reaction time at 65°C, which produced a yield of 97.1% methyl esters. A 9:1 ethanol to oil molar ratio (mol/mol), 1.00% sodium ethoxide concentration (wt%) and 120 min reaction time at 75°C were found to produce the maximum ethyl ester yield of up to 85%. The methanolysis of maize oil was depicted more rapidly as compared to the ethanolysis of maize oil. Gas chromatography of the produced biodiesel from maize oil showed high levels of linoleic acid (up to 50.89%) followed by oleic acid (up to 36.00%), palmitic acid (up to 9.98%), oleic acid (up to 1.80%) and linolenic acid (up to 0.98%). The obtained fatty acid esters were further analyzed by fourier transform infrared spectroscopy (FTIR) to ensure the completion of transesterification. The fuel properties of the produced biodiesels i.e. kinematic viscosity, cetane number, oxidative stability, pour point, cloud point, cold filter plugging point, ash content, flash point, acid value, sulfur content, higher heating value, density, methanol content, free glycerol and bound glycerol were determined. The analyses were performed using the FTIR method and the results were compared to the biodiesel standards ASTM and EN.

Download File

PDF (Abstract)
Comparative study of the methanolysis and ethanolysis of maize oils using alkaline catalysts.pdf

Download (37kB) | Preview

Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Institute of Advanced Technology
DOI Number: https://doi.org/10.3989/gya.06891
Publisher: Consejo Superior de Investigaciones Cientificas
Keywords: Alkaline catalysts; Ethanolysis; Fuel properties; Maize seed oil; Methanolysis
Depositing User: Muizzudin Kaspol
Date Deposited: 07 Oct 2014 04:12
Last Modified: 13 Nov 2015 01:54
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3989/gya.06891
URI: http://psasir.upm.edu.my/id/eprint/23291
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item