Lipid extraction from rice bran and Chinese tallow tree (CTT) using microwaves

Document Type

Conference Proceeding

Publication Date

12-1-2009

Abstract

Recently, microwaves have been used to extract oils and other bioactive compounds from traditional food crops. The purpose of this study was to investigate yields of lipids extracted in a batch microwave system from two feedstocks, rice bran and Chinese tallow tree seeds. The lipids obtained can be subsequently transesterified into biodiesel, thus reducing the current trend of utilizing edible crops for biofuel purposes. The solvent-feedstock mixtures were subjected to microwave radiation for different times (up to 20 minutes) and temperatures (60 °C to 120°C) with simultaneous magnetic stirring. The solvent (ethanol) to feedstock ratio used was 3:1. After extraction, solids were separated in a vacuum filter, and ethanol was subsequently evaporated in a vacuum centrifuge. The results showed that the lipid yield changes with temperature and achieves a maximum value in a relatively short time (order of minutes), with no yield increase at longer exposure times. The results compared well with traditional solvent extraction, especially when accounting for the extremely short times (minutes vs. hours). Maximum yields of 17.2% and 32.5% at 20 min and 120°C were achieved for rice bran and Chinese tallow tree seeds (CTT) respectively by microwave method compared to 12.4% and 26.34% using conventional heating. 096418.

Publication Source (Journal or Book title)

American Society of Agricultural and Biological Engineers Annual International Meeting 2009, ASABE 2009

First Page

3702

Last Page

3705

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