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Production and characterization of biodiesel from the seed of dacryodes edulis (african pear)

Author: 
Iloamaeke, I. M., Onuigbo C. C., Umedum, L. N., Umeobika, C. U. and Oforah P. U.
Subject Area: 
Physical Sciences and Engineering
Abstract: 

In this study, Oil from the seed of Dacryodes edulis was extracted using cold maceration method. The oil obtained had high acid value of 4.40mgKOH/g. Therefore the production of biodiesel was processed via two step acid – base transesterification process. The first step reduced the acid level to 2.60mgKOH/g while the second step involved direct conversion to fatty acid methyl ester using 1wt% NaOH as catalyst, 1:6 of oil to methanol ratio, 333 Kelvin and 1 hour reaction time. The yields of the oil and its methyl ester were 29% and 67% respectively. The biodiesel produced was analyzed for its fuel properties and yielded the following result; viscosity at 40oC (5.17mm2/s), density (0.87g/ml), cloud point (8oC), pour point (7.500C), flash point (1520C), fire point (1600C) and acid value (1.80mgKOH/g). The results obtained showed that most of the important properties were within the American standard test method (ASTM) of D 6751 of Biodiesel.

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