TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The drying step is carried out immediately after flattening step for not more than 24 hours after flattening step, preferably less than 2 hours after flattening step. The drying step is carried out at a temperature of 50-100 degrees C, preferably 70-90 degrees C. The oil seeds are preheated at a temperature of 40-60 degrees C, before carrying out the flattening step to increase their plasticity. The oil seeds are preheated at a temperature of 50-55 degrees C for 5-20 minutes, before carrying out the flattening step, optionally in water vapor. The flattening of the oilseeds is done by rollers of which the spacing is less than 0.2 mm, preferably less than 0.1 mm. The flattening of oilseeds is done by smooth rollers, preferably in a single passage. The alcoholic medium of the transesterification step comprises one or more alcohol comprising 1-6 carbon alcohols comprising ethanol or methanol, optionally in combination with one or more aliphatic hydrocarbons. The flattened seeds are contacted with the alcohol medium prior to the transesterification with the catalyst, preferably for a period of 10-30 minutes at a temperature of 40-60 degrees C. The transesterification reaction is conducted at a temperature of 45-55 degrees C, preferably 50 degrees C, for a period of 10 minutes to 2 hours, preferably 20-40 minutes. The contacting of flattened seeds with the alcoholic medium in transesterification step is carried out under gentle agitation or by watering and percolating. The process further comprises extracting alcohol from the solid phase after separation step; optionally recovery of the solid phase; filtrating and regrouping the liquid phases obtained from separation step and the extraction step. The extraction step is carried out by percolating, preferably against countercurrent, with ethanol, with mass ratio of alcohol/flattened seeds of 100/100 to 200/100. The neutralizing step is carried out using an acid comprising sulfuric acid, chlorhydric acid, phosphoric acid, citric acid or acetic acid. The elimination step of alcohol is carried out by evaporation at a temperature of 50-100 degrees C, under a pressure of 200-1000 mbars, preferably 80 degrees C under atmospheric pressure, to obtain an alcohol residual rate of less than 1%. The separation of the glycerin from fatty acid esters during elimination step is carried out by centrifugation at a temperature 60-80 degrees C. The fatty acid esters are washed with water, at 80 degrees C, separated from the washing water, preferably by decantation or centrifugation, at 80 degrees C, then dried, by evaporation at 90-100 degrees C, under a pressure of 200 mbar, to obtain a residual water rate of less than 500 ppm with respect to the total dry matter, after elimination step. The solid phase is further added with washing water. The elimination of alcohol from the solid phase is carried out mechanically, preferably by pressing or spin-drying, then thermally, by conducting in water vapor, to obtain a residual water content of less than 500 ppm with respect to the total dry matter. Preferred Components: The thickness of flattened seeds is 10 mu m to 1 mm, preferably 0.2-0.3 mm. The dimension of flattened seeds is 3-5 mm. The alcohol medium is ethanol containing a quantity of water less than 5000 ppm. The catalyst of transesterification step is a basic catalyst comprising soda, potash, carbonate or sodium or potassium hydrogen carbonate or sodium carbonate or potassium carbonate, sodium methylate or sodium ethanolate or potassium ethanolate. The mass ratio of catalyst/flattened seeds in transesterification step is 0.5/100 to 2/100 and the mass ratio of alcohol/flattened seeds in transesterification step is 150/100 to 500/100. The alcohol used in the extraction step is 1-6 carbon alcohol. The alcohol is ethanol containing a quantity of water of less than 5000 ppm. The acid of the neutralization step is added in a quantity having a pH of 10. The acid in the neutralization step is added to the liquid phase after separation or filtration step in a quantity of less than 0.04% of the total quantity of fatty acid esters present in the liquid phase. EXAMPLE - No suitable example given.