NOVELTY - Producing a biofuel from organic matter (2), comprises: (i) generating a supercritical aqueous solvent; (ii) contacting the organic matter with the supercritical aqueous solvent to form a reaction mixture, where the contacting causes a supercritical to subcritical phase change in the aqueous solvent; and (iii) treating the reaction mixture at 250-400 degrees C and a pressure of 100-300 bar.    USE - The method is useful for producing the biofuel (claimed), comprising bio-oil, oil char e.g. carbon char with bound oils, soluble light oil, gaseous product e.g. methane, hydrogen, carbon monoxide and/or carbon dioxide and alcohol e.g. ethanol, and methanol and biodiesel, where the bio-oil and the oil char products comprise e.g. phenols, aromatic and aliphatic acids, ketones, aldehydes, hydrocarbons and plant sterols. The biofuels are used as directly e.g. petroleum products.    ADVANTAGE - The method: provides biofuel having reduced oxygen content (less than 10 wt.%), increased hydrogen content (greater than 8 wt.%), increased energy content (gross calorific value of more than 35 mega joules/kg) and increased stability, where the biofuel is more suitable for storage and/or blending with conventional fuels e.g. diesel, and more easily upgraded into higher quality fuel products; does not require, the separation of feedstock material into different components, and the use of hydrolytic enzymes or microorganisms to ferment sugars, thus provides cost benefits, and requires less energy; and utilizes carbon containing wastes e.g. sewage, manure, household or industrial waste materials as organic matter.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) the biofuel produced by the method; and    (2) a continuous flow apparatus for converting organic matter into biofuel, comprising: an injection device (11) arranged to bring the supercritical solvent into direct contact with the organic matter, thus facilitating the supercritical to subcritical phase change in the solvent; at least one pump for propelling the organic matter and supercritical solvent separately and under pressure into the injection device; a reactor (20) in communication with the injection device and operable to maintain the organic matter and solvent at a target temperature and pressure for a defined time period; and a pressure let-down device.    DESCRIPTION OF DRAWING(S) - The figure illustrates a schematic diagram of the apparatus for converting organic matter into biofuels.    Organic matter (2)    Injection device (11)    Supercritical boiler (19)    Reactor (20)    Slurry cooler (24)