NOVELTY - Producing biodiesel from wet biomass, comprises: (a) providing wet biomass comprising water and biomass solids; (b) heating wet biomass at first temperature and first pressure for 10-480 minutes to form aqueous solution and solid agglomerate containing hydrolyzed lipid component, provided that at least a portion of water present in wet biomass is in a liquid phase throughout the step of heating, and that the first temperature and first pressure are below super-critical conditions for water; and (c) transesterifying the hydrolyzed lipid component to form biodiesel.    USE - The method is useful for producing biodiesel.    ADVANTAGE - The method: minimizes the need for extensive dewatering steps as the solid agglomerate is easy to separate from the aqueous solution; eliminates the need for wet biomass to dry or undergo oil-water separation before heating at the first temperature and the first pressure; does not require elimination of biomass by-products before isolation of the hydrolyzed lipid component; minimizes biodiesel synthesis time and prevalence of heteroatoms in the biodiesel; provides biodiesel fuel with improved oxidative stability, excellent cold flow properties, and high cetane numbers; and utilizes triflate catalysts, which reduces cost, energy and environmental impact of biodiesel production from the wet biomass.    DETAILED DESCRIPTION - Producing a biodiesel from a wet biomass, comprises either: (a) providing the wet biomass comprising water and biomass solids, (b) heating the wet biomass at a first temperature and a first pressure for a time period of 10-480 minutes to form an aqueous solution and a solid agglomerate containing a hydrolyzed lipid component, where the first temperature is 150-300 degrees C, provided that at least a portion of the water present in the wet biomass is in a liquid phase throughout the step of heating to form the aqueous solution and the solid agglomerate, and that the first temperature and first pressure are below super-critical conditions for water, and (c) transesterifying the hydrolyzed lipid component to form biodiesel; (a1) providing the wet biomass comprising water and biomass solids, where the wet biomass comprises at least 70 wt.% of water, based on the total weight of the wet biomass, (b1) heating the wet biomass at a first temperature and a first pressure for 10-200 minutes to form an aqueous solution and a solid agglomerate containing a hydrolyzed lipid component, provided that the first temperature and the first pressure are below super-critical conditions for the water, at least a portion of the water present in the wet biomass is in a liquid phase throughout the step of heating to form the aqueous solution and the solid agglomerate, and the first temperature and the first pressure are below super-critical conditions for the water, (c1) combining the solid agglomerate and alcohol, and (d1) heating the solid agglomerate and alcohol to form the biodiesel; or step (a) as above per se, (b2) heating the wet biomass at a first temperature and a first pressure for 10-200 minutes to form an aqueous solution and a solid agglomerate containing a hydrolyzed lipid component, where the first temperature is 190-275 degrees C and the first pressure is 0.1-20 MPa, provided that the first temperature and the first pressure are below super-critical conditions for water and at least a portion of the water present in the wet biomass is in a liquid phase throughout the step of heating to form the aqueous solution and the solid agglomerate, step (c1) as above per se, and (d2) heating the solid agglomerate and alcohol to a second temperature of 250-325 degrees C at a second pressure to form the biodiesel, provided that at least a portion of the alcohol is in the liquid phase or is in a super-critical fluid phase throughout the step of heating to form the biodiesel.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a reaction vessel used for heating a wet biomass at the first temperature and the first pressure.    Biomass refinement system (10)    Reaction vessel (12)    Heating system (14)    Temperature controller (16)    Mixer device (18)