Procedure for extracting an unsaponifiable fraction contained in a vegetable oil, an oil that comes from a microorganism or a vegetable shortening, or a co-product from the refining industry of vegetable oils or oils that come from microorganisms, such such as deodorization leaks, comprising at least: A) a stage of transformation by saponification or esterification of said oils, said butter or said co-product of the refining industry of vegetable oils or the oils that come from of microorganisms in hydroalcoholic solution, B) a step of extracting the hydroalcoholic solution in which the fat fraction is separated from the unsaponifiable fraction by a liquid / liquid extraction, said procedure being characterized by the liquid / liquid extraction of stage B it is carried out using a first solvent system comprising a tert-butyl ether content, in pairs ticular 2-ethoxy-2- methylpropane, also called ethyl-tert-butyl ether (ETBE), or a mixture of tert-butyl ethers with fluorinated aromatic solvents, in particular trifluorotoluene (BTF) and hexafluorobenzene (BHF ), solvents comprising at least one silicon atom, in particular hexamethyldisiloxane (HMDS) and tetramethylsilane (TMS) or methyl tetrahydrofuran (MeTHF), and mixtures thereof, of at least 50% by volume with with respect to the total volume of the solvent system.Procedimiento de extracción de una fracción insaponificable contenida en un aceite vegetal, un aceite que procede de un microorganismo o una manteca vegetal, o en un co-producto de la industria del refinado de los aceites vegetales o de los aceites que proceden de microorganismos, tal como los escapes de desodorización, que comprende por lo menos: A) una etapa de transformación por saponificación o esterificación de dichos aceites, de dicha manteca o de dicho co-producto de la industria del refinado de los aceites vegetales o de los aceites que proceden de microorganismos en solución hidroalcohólica, B) una etapa de extracción de la solución hidroalcohólic
