After fermentation ethanol is concentrated using distillation and molecular sieve columns.
The ethanol concentration is monitored using Vaisala K-PATENTS® process refractometer at the feed and product lines of the distillation process to increase efficiency by enabling less energy consumption. The in-line refractometer also monitors the concentration of the top product (ethanol), providing important information for distillation control and optimization. After molecular sieves, the refractometer is monitoring the concentration of the final product.
Next, denaturant, usually 2-5 % gasoline, is added to 100% pure ethanol to render the alcohol unfit for human consumption. Then, the ethanol is stored and ready for transportation and distribution.
Learn the details of the bioethanol purification process from the application note.
Download the application note in PDF by filling the form.
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