Effects of Drying Conditions on Fuel Property of Physic Nut (Jatropha Curcas)

  • Uthman, F. Department of Agricultural and Bio-Environmental Engineering, Kwara State Polytechnic, Ilorin, Nigeria.
  • Onifade, T.B. Department of Agricultural Engineering, Ladoke Akintola University of Technology, P.M.B. 4000, Ogbomoso, Nigeria.
Keywords: physic nut, drying kinetics, fuel property, temperature and air velocity.


Physic nut (Jatropha curcas) is a bio-material that requires effective drying for easy extraction to produce oil and biofuel.  Temperature and air velocity had effect on drying characteristics of physic nut which determined its fuel property. The study of drying kinetics is necessary to give information about the time required for drying physic nut and the effects of temperature on the fuel property. The drying  kinetics of physic nut were investigated in a locally made electric crop dryer. The drying kinetics of physic nut was conducted at selected temperatures of 40, 50, 60, 70 and 80 °C and air flow of 1.0 and 2.0 m/s. Proximate analysis carried out were volatile matter, ash and fixed carbon contents at selected temperatures of 40, 50, 60, 70 and 80 °C. Temperature had significant effect on the fuel property of physic nut. The ash content increased, fixed carbon content and volatile matter content decreased as temperature increased from 40 to 80 oC. The drying time to achieve desired products’ quality was achieved and effects of temperature and air velocity on the fuel properties of physic nut have been established.


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