Alcoholysis of Carica Papaya Seed Oil to Diesel Like Fuel

R. U. Owolabi(1*), N. A. Osiyemi(2)

(1) University of Lagos, Chemical Engineering Department, Lagos State, Nigeria., Nigeria
(2) Fountain University, Industrial & Environmental Chemistry Department,Osogbo, Nigeria., Nigeria
(*) Corresponding author

DOI's assignment:
the author of the article can submit here a request for assignment of a DOI number to this resource!
Cost of the service: euros 10,00 (for a DOI)


Extensive efforts were made in this study to extract oil from Carica papaya seeds (an untapped resource), trans-esterify the extracted oil and check for the fuel properties of the produced pawpaw seed oil based biodiesel. Normal hexane was used as solvent for the extraction. 63.05g of oil was extracted from 275g of pawpaw seeds to give oil yield of 22.93%. Lyed methanol in  60% excess was reacted with the heated oil with thorough agitation for some minutes. Fuel properties such as cloud point, API gravity, cetane number, diesel index etc were found not only to be competitive with biodiesel made from other oils but also meet some of the requirements of the ASTM Standards (American Standard for Testing and Methods ) against which biodiesel must be measured and therefore fits to be used as a blend with fossil fuel diesel in trucks and other machineries. This paper however intends to draw the attention of researchers and policy makers through thorough experimentation on a forgotten resource (pawpaw seed oil) and its suitability as a major feedstock for biodiesel production so as to  conserve the fossil fuel and further create a balance between food security and energy security
Copyright © 2013 Praise Worthy Prize - All rights reserved.


Carica Papaya; Cloud Point; API Gravity; Cetane Number; Diesel Index; ASTM

Full Text:



Bhaskara, B.K. Modern petroleum refining processes, ( 2nd Ed ).New Delhi : Oxford and IBH Publishing Company, 1990.

Knothe. Industrial Oil. National Center for Agricultural Utilization Research, Agricultural Research Service ,U.S Department of Agriculture,U.S.A ,2001.

Van , J.G , Shanks, B and Pruszko, R. Biodiesel Production Technology, Department of Energy Office of Energy Efficiency and Renewable Energy, Midwest Research Institute, Battelle ,2004.

Koji ,Y; Atsushi, U; and Yuzuru, S. Influence of Physical and Chemical Properties of Biodiesel Fuel on Injection, Combustion and Exhaust Emission Characteristics in a DI-CI Engine,COMODIA Symposium, July 1-4, 2001, Nagoya.

Ghazali, H.M , Puangsri, T, Abdulkarim, S.M . Properties of Carica Papaya.(Papaya) Seed Oil Following Extractions Using Solvent And Aqueous Enzymatic Methods, Journal of Food Lipids, 12, 2004, 62–76.

Von Maltitz, G. P. , Brent, A. Assessing the biofuel options for Southern Africa.Science real and relevant: 2nd CSIR Biennial Conference, pp16, Pretoria. Retrieved February 18, 2011, from Researchb Space Data Base on the World Wide Web: , 2008.

Forson, F.K , Oduro , E.K , Hammond– Donkoh, E. Performance of Jatropha Oil Blends in a Diesel Engine . Renew. Energ., 29, 2004, 1135–1145.

Ofoegbu,O, Nwobi,B.E, Adesina,O.B. Extraction and Qualitative Assessment of African Sweet Orange Seed Oil, African Journal of Food Agriculture ,Nutrition and Development, 6,2 ,2006.

Marfo, E.K, Oke, O.L , Afolabi, O.A . Chemical Composition of Papaya (Carica Papaya) Seeds. Food Chem. 22, 1986, 259–266.

Singh, L.D , Papaya, p. 224, IBH publishing, New Delhi, India ,1990.

Tiwari, A.K, Kumar, A, Raheman, H .Biodiesel production from jatropha oil (jatropha Carcus) with high free fatty acids: an optimized process. Biomass and Bioenergy, 31, 2007 , 569–575.

Alamu, O.J , Akintola, T.A , Enweremadu C.C , Adeleke .A.E, Characterization of palm-kernel oil biodiesel produced through NaOH-catalysed transesterification process, Scientific Research and Essay Vol.3 (7), 2008 ,308-311.

Reddy, J.N , Ramesh, A. , Parametric studies for improving the performance of a Jatropha oilfuelled compression ignition engine. Renewable Energy, 31, 2005 , 1994-2016.

Sandip , K. H , Ahindra N, (2008). Utilization of Three Non-Edible Vegetable Oils for the Production of Biodiesel Catalysed by Enzyme, The Open Chemical Engineering Journal, 2, 79-83.

Mohd Ghadafi Bin Ismail, (2008). Biodiesel Production From Waste Cooking Oil Via Single Steps Tranesterification Process with the Aid of Sodium Methoxide As a Catalyst, Unpublished B.Sc Thesis, Faculty of Chemical & Natural Resources Engineering ,Universiti Malaysia Pahang.


  • There are currently no refbacks.

Please send any question about this web site to
Copyright © 2005-2018 Praise Worthy Prize