Production of biodiesel from triglycerides via a thermal route
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United States of America Patent
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Issued Date -
Jun 21, 2007
app pub date -
Dec 16, 2005
filing date -
Dec 16, 2005
priority date (Note) -
Abandoned
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Abstract
A method is presented for producing biodiesel from a triglyceride feedstock. The feedstock is first thermally cracked to remove contaminants and convert triglycerides to form a middle distillate fraction rich in fatty acids. The middle distillate fraction is then esterified the in the presence of an alcohol and a catalyst to produce a biodiesel stream. The biodiesel stream can be treated with a basic solution to convert unesterified free fatty acids to non-foaming metallic soaps, which can be removed by centrifugation, filtering or a combination thereof. A method is also provided for producing a biodiesel/naphtha mixture, in which a triglyceride feedstock is thermally cracked to produce a middle distillate fraction, a naphtha stream and a gas stream. The naphtha stream and the middle distillate fraction are then esterified to produce a mixed biodiesel/naphtha stream, which can be treated with a basic solution to convert unesterified free fatty acids to non-foaming metallic soaps. The basic salts are removed by known means.
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