Processes for selective extraction of unsaponifiable materials from renewable raw materials by reactive trituration in the presence of a cosolvent

A method for extracting an unsaponifiable fraction from a renewable raw material comprising lipids functionalized with one or more function(s) chosen from hydroxyl, epoxide, ketone, thiol, aldehyde, ether and amine functions, comprising the following steps:

• a) dehydration optionally preceded or followed with a conditioning of the renewable raw material,
• b) reactive trituration of the raw material dehydrated and optionally conditioned, in the presence of at least one polar organic solvent comprising at least one light alcohol, at least one non-polar cosolvent immiscible with said light alcohol and at least one catalyst, resulting in the formation of a polar organic phase enriched with lipids functionalized with one or more function(s) chosen from hydroxyl, epoxide, ketone, thiol, aldehyde, ether and amine functions,
• c) concentration of the polar organic phase to obtain a mixture enriched with an unsaponifiable fraction, optionally preceded, accompanied or followed with a heat treatment at a temperature higher than or equal to 75° C., preferably higher than or equal to 80° C.,
• and comprising optionally the following steps:
• d) saponification of the mixture enriched with the unsaponifiable fraction,
• e) extraction of the unsaponifiable fraction from the saponified mixture.

A method for extracting an unsaponifiable fraction from a renewable raw material comprising the following steps:

• a) dehydration optionally preceded or followed with a conditioning of the renewable raw material,
• b) reactive trituration of the raw material dehydrated and optionally conditioned, in the presence of at least one polar organic solvent comprising at least one light alcohol, at least one non-polar cosolvent immiscible with said light alcohol and at least one catalyst, resulting in the formation of a non-polar organic phase enriched with lipids containing no or few hydroxyl, epoxide, ketone, thiol, aldehyde, ether and amine function(s),
• c) concentration of the non-polar organic phase to obtain a mixture enriched with an unsaponifiable fraction,
• and comprising optionally the following steps:
• d) saponification of the mixture enriched with the unsaponifiable fraction,
• e) extraction of the unsaponifiable fraction from the saponified mixture,
• wherein said renewable raw material undergoes optionally a heat treatment at a temperature higher than or equal to 75° C., preferably higher than or equal to 80° C., before or during step b).