Patent ID: 9126917
Filing Date: 2015-09-08
Classification: C07C

Abstract:
1. A process for purifying vanillin and derivatives thereof, starting with an initial solution of vanillin or of a vanillin derivative in a solvent S1 containing impurities, comprising the following steps: a) a step of evaporation of said solvent S1 in the presence of water from said initial solution of said vanillin or of said vanillin derivative containing said solvent S1 to obtain an aqueous solution of said vanillin or of said vanillin derivative; b) a step of liquid/liquid extraction by placing the aqueous solution obtained after step a) in contact with a solvent S2, at a pH greater than 8 and less than 10, to obtain an organic phase comprising said solvent S2 and an aqueous phase containing said vanillin or said vanillin derivative and residual solvent S2; c) a step of precipitation, at a pH of between 4 and 7.5, of said vanillin or said derivative contained in the aqueous phase obtained after step b), and d) a step of isolation of said vanillin or said derivative thereof.