Low Temperature Glycerolysis as a High FFA Pre-Treatment Method for Biodiesel Production - Advances in Chemical Engineering and Science

ACES > Vol.3 No.4, October 2013

Advances in Chemical Engineering and Science

Volume 3, Issue 4 (October 2013)

ISSN Print: 2160-0392 ISSN Online: 2160-0406

Google-based Impact Factor: 1.41 Citations h5-index & Ranking

Low Temperature Glycerolysis as a High FFA Pre-Treatment Method for Biodiesel Production ()

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Download as PDF (Size: 515KB) PP. 248-254

DOI: 10.4236/aces.2013.34032 6,372 Downloads 10,994 Views Citations

Author(s)

Godlisten G. Kombe, Abraham K. Temu, Hassan M. Rajabu, Godwill D. Mrema, Keat Teong Lee

Affiliation(s)

ABSTRACT

A novel low temperature glycerolysis process for lowering free fatty acid (FFA) in crude jatropha oil for alkali catalyzed transesterification has been developed. The response surface methodology (RSM) based on central composite design was used to model and optimize the glycerolysis efficiency under three reaction variables namely; reaction time, temperature and glycerol to oil mass ratio. The optimum conditions for highest glycerolysis efficiency of 98.67% were found to be temperature of 65℃, reaction time of 73 minutes and 2.24 g/g glycerol to oil mass ratio. These conditions lower the high free fatty acid of crude jatropha oil from 4.54% to 0.0654% which is below 3% recommended for alkali catalyzed transesterification. The pre-treated crude jatropha oil was then transesterified by using homogeneous base transesterification resulting to a conversion of 97.87%. The fuel properties of jatropha biodiesel obtained were found to be comparable to those of ASTM D6751 and EN 14214 standards. The process can also utilize the crude glycerol from the transesterification reaction, hence lowering the cost of biodiesel. The glycerolysis is easier implemented than acid esterification thereby avoiding the need for neutralization and alcohol removal step.

KEYWORDS

Biodiesel; Glycerolysis; Free Fatty Acid; Re-Esterification

Share and Cite:

Kombe, G. , Temu, A. , Rajabu, H. , Mrema, G. and Lee, K. (2013) Low Temperature Glycerolysis as a High FFA Pre-Treatment Method for Biodiesel Production. Advances in Chemical Engineering and Science, 3, 248-254. doi: 10.4236/aces.2013.34032.

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