Business Green: Biofuels made from whisky by-products could be available on Scottish roads within a few years after a team of researchers at Edinburgh Napier’s Biofuel Research Centre this week filed for a patent for the new fuel. The team, which is now planning to form a spin-off company to commercialise the fuel, used pot ale waste liquid and spent grains known as draff from Diageo’s Glenkinchie Distillery to develop a method of producing butanol. The researchers said the resulting …