Celtic Renewables Ltd, a spin-out of Edinburgh's Napier University, is pioneering the commercial production of biobutanol, a high-value "clean" fuel capable of directly replacing petrol. The process, which was pioneered by Professor Martin Tangney, director of Napier's biofuel research centre, can also produce valuable acetone, ethenol and animal feed.
Celtic Renewables duo Mark Simmers and Martin Tangney are using by-products from whisky and beer to replace petrol
