Properties of rapeseed oil for use as a diesel fuel extender |
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| Authors: | K McDonnell S Ward J J Leahy P McNulty |
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| Affiliation: | (1) Department of Agricultural and Food Engineering, University College Dublin, Earlsfort Terrace, Dublin 2, Ireland;(2) Industrial Chemistry Department, University of Limerick, Plassey Park, Limerick, Ireland |
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| Abstract: | Chemical and thermal analyses were carried out on degummed and filtered (5 μm) rapeseed oil (referred to as SRO, i.e., semirefined
rapeseed oil) to determine its suitability as a diesel fuel extender. The upper rate for inclusion of SRO with diesel fuel
is 25%. This fuel blend had a phosphorus level of 2.5 ppm, which was comparable to rape methyl esters (1.0 ppm phosphorus).
Thermogravimetric analyses were used to estimate the cetane ratings of the fuels. A 25% SRO/diesel blend had an estimated
cetane index of 32.4 compared to 38.1 for diesel fuel only. Differential scanning calorimetry and thermogravimetric analyses
were used to compare the volatility ranges of the fuels. SRO needed higher temperatures for volatilization (i.e., 70–260°C
for diesel fuel vs. 280–520°C for SRO). This indicated poorer cold-starting performance of SRO compared with diesel fuel.
SRO fuel is a low-sulfur, high-oxygen fuel giving SRO a more favorable emissions profile than pure diesel fuel. |
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| Keywords: | Biodiesel diesel fuel differential scanning calorimetry estimated cetane index industrial oil methyl esters rapeseed oil thermogravimetric analysis |
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