Patent ID: 9403745
Filing Date: 2016-08-02
CPC Classification: C07C

Claim Text:
1. A method of separating phenolic compounds, the method comprising separating the phenolic compounds in salified form from an aqueous reaction mixture resulting from a reaction of a phenolic compound and glyoxylic acid in the presence of a base, leading to a reaction mixture comprising at least an excess of phenolic starting compound in salified form and various mandelic compounds in salified form, resulting from the reaction, wherein the reaction mixture comprising the phenolic starting compound in salified form is contacted with an inert adsorbent support comprising no functional groups, leading to selective adsorption of said phenolic compound on said support, and to recovery of an aqueous stream comprising the mandelic compounds in salified form obtained from the reaction, and in that the phenolic compound fixed on the adsorbent is desorbed by a regenerative treatment of said adsorbent.