Greener
Journal of  Agricultural Sciences
Vol. 2 (5),
pp. 195-206,
September
2012

 ISSN: 2276-7770 

Research
Paper

Manuscript
Number:07271207

 

Comparative Studies of Oxidative Stability Properties of
Biodiesel Produced from

Azadirachta indica
and Hevea brasiliensis seeds.

 

C. S. Ezeanyanaso¹*, V. I. Ajibola²,
E. B. Agbaji², E.M. Okonkwo¹,

O. J. Okunola¹ and Y. Alhassan¹

 

¹National
Research Institute for Chemical Technology, P. M. B. 1052,
Basawa, Zaria, Nigeria.

²Department
of Chemistry, Ahmadu Bello University, Zaria, Nigeria.

 

*Corresponding Author’s Email: chikaeze2 @ gmail. com

Abstract:

The aim of
the study was to establish the stability of biodiesel due to
oxidation. Two non-edible seed oils were used;

Azadirachta indica
and Hevea brasiliensis were used to produce biodiesel
and first rapid oxidative stability of the biodiesel were
assessed then their properties with and without additives
compared thereof over a range of one year storage period.
The results of stability of the biodiesels for rapid
induction and long term period with and without additives
revealed that physico-chemical properties of the biodiesel
produced from
Azadirachta
indica
and Hevea brasiliensis seeds oil changed with the
time. For the rapid test, none of the biodiesel samples
could pass the 6 hrs oxidation test with neem biodiesel
exhibiting the best oxidation stability and the rubber seed
the worst. Both the additives, namely 0.5%
tert-butyl
hydroquinone (TBHQ) and 0.1% Ecotive
increased the oxidation stability of all the three biodiesel
samples to more than 6hrs. The one year storage stability
study revealed that per-oxide value, density, viscosity and
acid number increased for all the methyl esters with time.
However, the calorific value was found to be decreasing for
all the samples. The rate of change of different physico-chemical
properties was found to be less in case of all the biodiesel
with an additive. However, Ecotive appeared to be a better
additive as compared to TBHQ for increasing the shelf life
of biodiesel.

 

Keywords: Oxidative Stability,
Biodiesel,

Azadirachta indica, Hevea brasiliensis,


TBHQ, Ecotive. 

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