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| Trace Contaminant Analysis in Biodiesel with an Antaris II FT-NIR Analyzer |
| This study shows that the Thermo Scientific Antaris? II Fourier transform near-infrared (FT-NIR) analyzer can quickly and accurately quantify the concentration of contaminants in biodiesel. |
| The ability to quantify trace contaminants in biodiesel is important for
optimizing the biodiesel production process and ensuring final product quality.
The most commonly used process for making biodiesel is the base-catalyzed
transesterification reaction of an oil or fat. The oil (triglyceride) is reacted
with excess alcohol in the presence of a catalyst (KOH or NaOH) to produce
biodiesel and glycerol. The transesterification reaction is very efficient with
yields approaching 100%. If the reaction worked perfectly only biodiesel and
glycerol would be present after reaction. Any trace contaminants such as
glycerol, glycerides, water, methanol or free fatty acids in the biodiesel
indicates that some step in the process is not optimized including the reaction.
Contaminants that are of most importance for biodiesel final product quality are
free and total glycerol, water, and methanol since they must meet ASTM D6751-07
specifications.
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