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A Scottish company is using ABE fermentation to make ethanol and butanol with pot ale and draff, the byproducts of whisky distillation
Quelle:: Celtic Renewables
Each year the whisky industry produces 1 600 million litres of pot ale and 500 000 tonnes of draff, the main byproducts of whisky distillation, and the Scottish company Celtic Renewables has found a way to turn them into biofuel.They employ ABE fermentation, a technique used during World War I to make acetone for the production of cordite, a smokeless gunpowder used in firearms.
The pot ale and draff are combined, treated with heat and acids, and then fermented with the help of special bacteria and enzymes. Once this process is complete, the liquid portion of the mixture is removed and distilled into butanol, ethanol and acetone, while leftover solids can be used as animal feed.
At the beginning of September, Celtic Renewables earned a grant from the UK Department of Transportation, which will help them build the world's first biofuel plant that uses whisky byproducts.