METHOD FOR OBTAINING ALCOXY-HYDROXYBENZALDEHYDE, THAT IS SUBSTANTIALLY FREE OF ALKYL-ALCOXY-HYDROXYBENZALDEHYDE

摘要

FIELD: technological processes.;SUBSTANCE: present invention relates to a process of the production of at least one alkoxyhydroxybenzaldehyde ("AHBA") which can be used as a flavor or perfume, and also as an intermediate from at least one hydroxyphenol ("HP"). Method includes the step of forming at least one alkoxyphenol ("AP") and alkyl alkoxyphenol ("AAP") and the step of separating (S) AP from AAP, the separation step (S) being carried out before obtaining AHBA, the AHBA compound is prepared by attaching an aldehyde group to the AP compound by condensation with glyoxylic acid, followed by oxidation of the resulting compound, and the separation step (S) is carried out before oxidation to form an AHBA compound. Invention also relates to a method for separating guaiacol (GA) and/or gvetol (GE) from a mixture containing GA and/or GE and a process for synthesizing at least one AP in the vapor phase.;EFFECT: proposed method makes it possible to obtain AHBA with high purity and good yield with high conversion of HP.;17 cl, 4 dwg, 3 ex