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Published March 20, 2013, 12:00 AM

Tharaldson tower

It is of the largest single-column distillation towers in the world, says Ryan Thorpe. Under pressure, alcohol has a lower boiling temperature lower than water. Once they the ethanol is produced, it must be distilled from the water. The photo was taken March 15, 2013, at the company plant west of Casselton. (Forum News Service/Agweek/Mikkel Pates)