NOVELTY - Making biodiesel fuel in a biodiesel plant (P1) comprising closed loop reaction chamber, means for circulating reactants through chamber and means for causing turbulent flow of reactants through chamber, comprises: heating reactants; mixing heated reactants in chamber by causing turbulent flow through reaction chamber causing the reactants to react and form reacted reactants; further circulating reactants and reacted reactants in chamber; and removing reacted reactants from outlet, where reacted reactants comprise crude biodiesel fuel, and allowing crude biodiesel fuel to settle.    USE - The method is useful for making biodiesel fuel in a biodiesel plant.    ADVANTAGE - The method utilizes the loop reactor which is truly a major advancement in biodiesel production.    DETAILED DESCRIPTION - Making biodiesel fuel in a biodiesel plant (P1) comprising a closed loop reaction chamber having an inlet and an outlet, where the closed loop reaction chamber comprises a closed loop flow path, and the inlet and outlet are disposed along the closed loop flow path, means for circulating reactants through the reaction chamber such that portions of the reactants will pass along the loop from the inlet, past the outlet and back past the inlet for mixing with the other portions of the reactants entering at the inlet, and means for causing turbulent flow of the reactants through the reaction chamber, comprises: heating the reactants; mixing the heated reactants in the reaction chamber by causing turbulent flow through the reaction chamber causing the reactants to react and form reacted reactants; further circulating the reactants and the reacted reactants in the reaction chamber along the closed loop from the inlet, past the outlet and back past the inlet for mixing with other portions of the reactants entering at the inlet such that at least some reactants and reacted reactants will flow around the reaction chamber multiple times and mix with reactants entering at the inlet; and removing the reacted reactants from the outlet, where the reacted reactants comprise crude biodiesel fuel, and allowing the crude biodiesel fuel to settle. INDEPENDENT CLAIMS are also included for:    (1) a biodiesel plant (P2), comprising: a mixing section for mixing reactants; a loop-shaped reaction chamber; means for circulating the mixed reactants through the reaction chamber causing the reactants to react; and a tank for receiving the mixed and reacted reactants, where the mixing section comprises a first conduit and a first pump for pumping a first type of feed stock along the first conduit, and a second conduit and a second pump for pumping a second type of feed stock along the second conduit, and a T-connector for joining the first and second conduits to mix the first type of feed stock and second type of feed stock prior to entry into the reaction chamber and the first conduit contains a bypass loop (23); and    (2) a biodiesel plant (P3) for making biodiesel from reactants including a raw material having fatty acid esters and methanol, comprising: a supply of a raw material having fatty acid esters; a supply of methanol; a mixing section for mixing the raw material and the methanol to form mixed reactants; a closed loop reaction chamber, where the closed loop reaction chamber has an inlet and outlet and comprises a closed loop flow path, and the inlet and outlet are disposed along the closed loop flow path; means for advancing the mixed reactants from the mixing section and into the closed loop reaction chamber through the inlet; means for circulating the mixed reactants through the reaction chamber causing the reactants to react and form reacted reactants such that portions of the reactants and portions of the reacted reactants will pass along the closed loop from the inlet, past the outlet and back past the inlet for mixing with other portions of the reactants entering at the inlet such that at least some reactants and reacted reactants will flow around the reaction chamber multiple times; a tank for receiving the reacted reactants downstream of the outlet of the reaction chamber including crude biodiesel fuel having biodiesel fuel and glycerin; and a separator for receiving an output from the tank and separating glycerin from biodiesel fuel, where the means for advancing comprises a first pump and moves the reactants through the plant including into the reaction chamber and moves the reacted reactants through the plant including out of the reaction chamber, and the means for circulating comprises a second pump for circulating the reactants and reacted reactants in the reaction chamber at a rate higher than a flow rate of the first pump.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a feed stock supplying portion of a plant for forming biodiesel from feed stock using a loop reactor.    Bypass loop (23)    Conduit (25)    Mixer (30)    Storage tank (32)    Pump (34)