Humfreys (WO2009/015409) discloses a process for converting organic matter such as lignite or brown coal, lignin, cellulose, hemicellulose, organic waste, plastic or a generic polymer into products including mixing it with a supercritical liquid comprising one or more of the group consisting of water, methanol, and ethanol at a pressure greater than 220 bar (up to more than 300 bar) and temperatur