A Comparative Study of the Uv Spectra and Energy Values of Cold Press and Solvent Extracted Castor Oil

The castor oil is colorless or pale yellow with some odor when crude. The major components of fatty acids of castor oil are unsaturated fatty acid, hydroxylated 12-hydroxyl, 9-octadocenic acid. Its major fatty acid is the unsaturated ricinoleic acid 18-carbon atoms and a double bond between the 9th and 10th carbon and OH at C-12 hence also called dodecahydroxyoleic acid. About 87%-90% of the fatty acid in castor oil is ricinoleic acid.

The research work was carried out with the objective of extraction of oil from castor seeds and determining the UV Vis absorbance wavelength, whether the absorbance’s obeys beer lamberts law and also determine the calorific values of castor oil obtained from plants growing at different locations and extracted using different methods.

 The country is getting modernized and industrialized day by day hence vehicles and engines are constantly increasing but energy sources are decreasing gradually and the crude oil prices are in turn increasing. This increasing demand for energy can result in a huge crisis at the end of fossil fuels era hence the situation lead to seek of alternative fuel for diesel engines biodiesel being one of the alternative fuels. The castor seeds contain above 47% oil and are non edible seeds. Since many of the biodiesel feedstock used are edible oil sources, there is a huge imbalance in the human nutrition chain versus fuel. This has led to need of non edible seed feedstock castor oil being one of them. Biodiesel obtained from castor seeds have a lower cost compared to those from other oils. Due to its solvability in alcohol transesterification occurs without heating. The use of bio-fuel will reduce the consumption of petroleum derived fuels minimizing the harmful effect on the environment. The studies indicated that the castor oil absorbs at a range of 207.00nm to 208.50nm and the source of the seeds doesn’t alter the maximum absorbance wavelength. By the use of Beers law, it was clear that absorbance increases with increase in concentration. The calorific energy obtained for the cold extracted oil averaged 22109-26875Kj/Kg where else that for the solvent extracted oil averaged 20247-24930Kj/Kg irrespective of the seed source. The calorific value is in accordance with the raw materials for biodiesel production which varies from 5443-14654kj/kg. It is within the range of hexadecane (cetane) which has10714kj/mole and is the standard reference material for determination of the ignition quality of petro-diesel. Considering obtained results in comparison with the desired energy for biodiesel production raw material, castor oil is good enough to be used for biodiesel since it is nonedible and grows in marginal land.

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