Publisher: Chemical Society of Nigeria

Biodiesel From Tephrosia Vogelii Seed Oil

D. R. Naron, M. P. L. Kagoro
KEYWORDS: Tephrosia vogelii, Seed oil, Biodiesel, Physicochemical.

ABSTRACT:

With  the  ever  increasing  demand  and  dwindling  fossil  fuel  resources  coupled  with  environmental  concern, biodiesel  seem  to  be  the  solution  for  the  future.  In  this  study,  Tephrosia  vogelii  (T.  vogelii)  seeds  were  extracted using  n-hexane  and  the  oil  was  converted  into  T.  vogelii  biodiesel  by  transesterification  with  methanol  in  the presence  of  sodium  hydroxide  as  catalyst.  The  physicochemical  properties  of  the  extracted  oil  were  acid  value  1.647mgKOH/g,  iodine  value  -58.42g,  saponification  number  -220.60mgKOH/g,  density  -0.905g/ml  and viscosity@40oC  -29.95mm2/s  and  that  for  the  biodiesel  are  acid  value  -0.501mgKOH/g,  viscosity@40oC  7.323mm2/s,  density  -0.884g/ml,  flash  point  158oC  and  cloud  point  -13oC.  The  physicochemical  properties  of  the biodiesel  were  in  close  agreement  with  ASTM  biodiesel  specification  standard  except  for  the  viscosity,  which was  slightly  above  the  standard.   GC-MS  analysis  confirmed  the  formation  of  methyl  esters  of  T.  vogelii  seed  oil which  showed  the  presence  of  seven  major  fatty  acids  with  four  saturated  and  three  unsaturated  fatty  acids.


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