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Suntory of Osaka, Japan, a company best known for its whisky, is patenting a
system for cleaning alcohol from the exhaust gas of engines or industrial
machinery (WO 99/42563). The exhaust pipe is connected to a filter containing
cultures for Candida, Pichia or Hansenula yeasts.
These microorganisms feed on any ethanol in the exhaust, eliminating it from the
gases as they pass through. Suntory claims that the organisms work over a long
period of time even when the gas has a high ethanol concentration.