TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The Jatropha seeds are mixed with soybeans at a ratio of 1-10.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The alkaline catalyst is sodium. The weight ratio of catalyst/alcohol/seeds is 0.001-0.01/0.1-5/1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The process further comprises preheating the seeds at a temperature of less than or equal to 100 degrees C, and performing warm-up operation performed before flattening. The step of drying the flattened seeds is carried out rapidly after flattening in less than one hour, preferably after 5-10 minutes, at a temperature sufficient to reduce the moisture of seeds of 2 wt.% or less. The step (ii) comprises carrying out a first reaction at 30-75 degrees C, preferably 50 degrees C, for 15-60 minutes, preferably 20-40 minutes, followed by extraction with alcohol carried out in 3-9 steps and at counter-current. The step of flattening is carried out by means of a mechanical roll crusher. The steps (i) and (ii) are carried out continuously. The higher phase is subjected to a series of chemical reactions and/or separating/purifying for obtaining biodiesel. The obtained cake is subjected to a drying step under conditions of temperature and time sufficient to inactivate the curcin. The step of drying the cake is carried out for 4 hours at a temperature less than or equal to 200 degrees C, preferably less than or equal to 120 degrees C. The step (ii) comprises adding a co-solvent comprising hexane, heptane, benzene, bicyclohexyl, cyclohexane, decalin, decane, gasoline, petroleum ether, kerosene, kerdane, diesel, methylcyclohexane, naphtha, Skellite (RTM: Toluene), tetradecane, Texsolve S (RTM: Fumed silica), Texsolve S-66 (RTM: Mixture predominantly saturated hydrocarbons), Texsolve S-LO (RTM: Medium aliphatic naphtha (aromatic 100)), Texsolve C (RTM: Heptane), Texsolve B (RTM: Hexane), Texsolve H (RTM: Hexane-heptane fraction), Texsolve V (RTM: Light naphtha), supercritical carbon dioxide, propane or pressurized butane, natural solvents such as terpenes (limonene, alpha and beta pinene), ethers such as dimethyl ether, diethyl ether and/or ketones such as acetone. Preferred Components: The light alcohol is methanol. The mixture comprising fatty acid esters and glycerol is subjected to a settling step to obtain a higher phase mainly composed of fatty esters of fatty acid and a lower phase mainly composed of glycerin and water.