Freez-it Cleen has secured a U.S. patent for technology that uses dry ice to clean the surfaces of equipment at biofuel plants, such as thermal oxidizers and boiler tube coils. Freez-it Cleen's system helped a 50-million-gallon-per-year ethanol plant save $150,000 in fuel costs over the course of a year, according to a 2008 independent audit by the Minnesota Technical Assistance Program.

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