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Edition:Final report; Aug. 2010 to June 2012
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NTL Classification:NTL-ENERGY AND ENVIRONMENT-Alternative Fuels
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Abstract:Vegetable oils have been investigated as a way to provide a renewable source for diesel fuel. A successful approach to using
vegetable oils in diesel engines has been transesterification of the oils with simple alcohols to produce mono-alkyl esters, or
biodiesel. A recent development in the area of alternative diesel fuels is a fuel produced from vegetable oils and animal fats using
specially modified hydrogenation processes in a conventional petroleum processing facility. This fuel is usually called renewable
diesel. This project has focused on developing an understanding of the processes involved with renewable diesel production from
a variety of bio-based feedstocks. The project has determined that Raney nickel is an effective catalyst for hydrogenation and
deoxygenation of fatty acids, which is a key step in the production of renewable diesel. We have also determined that
deoxygenation can take place in a hydrogen-lean environment so that fatty acids can be deoxygenated without having to be
completely hydrogenated. This is an important observation because hydrogenation affects the fuel’s cold flow properties by
increasing its melting point. We are continuing to explore decarboxylation without full hydrogenation as a way to provide
renewable diesel with superior low temperature properties.
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