Introduction
Biodiesel as an alternative fuel has attracted increasing
interest worldwide in recent years. In the United States, for
example, the biodiesel production capacity has increased
sharply from less than 100 million gallon/year in 2005 to an
expected 580 million gallon/year in 2007 (National Biodiesel
Board, http://www.biodiesel.org/pdf_files/fuelfactsheets/
Production_Capacity.pdf).