There's an interesting article in the latest issue of the Asia-Pacific Journal of Chemical Engineering explaining the 'development
of eggshell derived catalyst for transesterification of used cooking
oil for biodiesel production'.
One major drawback that prevents commercialization of biodiesel is
the high cost of vegetable oil feedstock. In this work, used cooking
oil, which is far cheaper than fresh vegetable oil, is used
as an alternative raw material. Prior to transesterification
reaction, esterification was conducted and catalyzed homogeneously to
eliminate free fatty acid. Heterogeneous catalyst derived from cheap
and easily obtained egg-shell (industrial waste) was used for
transesterification reaction. A 100% ester yield was obtained at the
optimized reaction conditions.
What a great use for eggshells.
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