Rhodia Operations

Other

Martine Vibert

Denis Revelant

Hubert Gayet

Corine Cochennec

Alain Etchebarne

Laurent Garel

François Metz

The present invention relates to a method for the purification of natural vanillin, comprising a step involving the stripping of a liquid flow Fcontaining natural vanillin. The invention also relates to the natural vanillin that can be obtained using the method of the invention, as well as a device for purifying natural vanillin.

Method for the purification of natural vanillin

The invention relates to a natural vanillin, which is in the form of an amorphous solid of which the color, in ethanolic solution at 10% by weight, is less than or equal to 200 Hazen, preferably less than or equal to 100 Hazen.

The invention relates to a method for the purification of natural vanillin, comprising at least one step in which the natural vanillin is evaporated.

A method is described for purifying vanillin, and derivatives thereof, from an initial solution of vanillin or of a vanillin derivative in a solvent S1 containing impurities, comprising the following steps: a) a step of evaporating the solvent S1 in the presence of water from such initial solution to obtain an aqueous solution of vanillin or of a vanillin derivative; b) a step of liquid/liquid extraction by bringing the aqueous solution obtained at the end of step a) into contact with a solvent S2, at a pH of greater than 8 and less than 10, to obtain an organic phase and an aqueous phase containing vanillin or a vanillin derivative and residual solvent S2; c) a step of precipitating, at a pH between 4 and 7.5, the vanillin contained in the aqueous phase obtained at the end of step b); and d) a step of isolating the vanillin or derivative thereof.

Method for purifying vanillin by liquid-liquid extraction

A method for preparing a compound of formula (I) which is a vanillin derivative, of dimer type, called 3-(4-hydroxy-3-methoxybenzyl)-4-hydroxy-5-methoxybenzaldehyde, such method comprising a reaction of vanillin and vanillyl alcohol in the presence of a base. 

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Lyons, France

Martine Vibert