Method for transesterifying vegetable oils
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United States of America Patent
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Apr 13, 2010
Grant Date -
Jan 27, 2005
app pub date -
Nov 8, 2002
filing date -
Nov 8, 2001
priority date (Note) -
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Abstract
The present invention relates to a method for producing Diesel grade fuel of plant origin by transesterifying a refined vegetable oil in a homogenous phase with a C1-C4 alkanol in the presence of an aliphatic hydrocarbon solvent with a boiling point of 40-200° C. and a catalyst to form a first polar phase comprising glycerol by-product and a first apolar phase comprising transesterified fuel, non-transesterified vegetable oil, and aliphatic hydrocarbon solvent, separating the first polar phase and the first apolar phase, and refining the fuel from the first apolar phase, wherein the C1-C4 alcohol is used in an amount selected from the group consisting of: a stoichiometric amount; and an excess not exceeding 30% of an stoichiometric amount, and the aliphatic hydrocarbon solvent is used in an amount of at least 0.2 parts by volume relative to the unit volume of the refined vegetable oil.
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