Aug 19, 2008. /Lesprom.com/. Danish technology firm Haldor Topsøe is piloting the production of the eco-friendly fuel DME from paper mill waste. One of the waste products of the paper pulping process is a liquid known as 'black liquor', and it is this copiously available material that has given the Danish industrial technology company Haldor Topsøe ideas for a waste-to-fuel concept that could help make diesel-engined cars and trucks of the future more environmentally friendly, reports financial daily newspaper Børsen. Together with Sweden's Chemrec, a world leader in black liquor gasification, Haldor Topsøe is setting up a pilot plant to turn black liquor first into synthesis gas, and then into a gas called dimethyl ether (DME) which can be used as a fuel for diesel engines, which only require slight structural modifications to run on DME. DME certainly has good credentials as an alternative diesel fuel of the future.