Adding value to carbon dioxide from ethanol fermentations

Carbon dioxide (CO2) from ethanol production facilities is increasing as more ethanol is produced for alternative transportation fuels. CO2 produced from ethanol fermentation processes is of high purity and is nearly a saturated gas. Such highly-concentrated source of CO2 is a potential candidate for capture and utilization by the CO2 industry. Quantity, quality and capture of CO2 from ethanol fermentations are discussed in this review. The established and emerging value-added opportunities and markets for CO2 from ethanol plants also are reviewed. The majority of CO2 applications are dedicated to serving carbonated beverage and food processing and preservation markets. Beyond traditional merchant markets, the potential for exploring some fresh and profitable markets are discussed including carbon sources in chemical industries for the following: enhanced oil recovery; production of chemicals, fuels, and polymers; and production of algae-based biofuels through CO2 fixation by microalgae.