BIOBASED SURFACTANT AND ANTIOXIDANT

원문 (중국어)

The invention relates to a method for isolating of a substituted guaiacol and/or a substituted syringol of formula (I) from a mixture containing lignin fragments, wherein Ris hydrogen or —OCH; Ris a linear or branched C-Calkyl or a linear or branched C-Chydroxyalkyl; Ris hydrogen or Na; comprising at least the steps of: a) Providing a mixture containing lignin fragments; b) Separation of the mixture of step a) into a lignin oligomer enriched fraction and a lignin monomer enriched fraction; c) Separating a solution comprising the compound according to formula (I) by fraction distillation, wherein Ris hydrogen, from the lignin monomer enriched fraction of step b); d) Adding an aqueous NaOH solution having a pH of 11 or more to the solution of step c) comprising compound according to formula (I), wherein Ris a cation; e) Isolating of the precipitated compound of step d); optionally followed by; f) Dissolve the isolated compound of step e) in water and lowering the pH of the aqueous solution to a value below pH using an acid; g) Isolation of a compound according to formula (I), wherein Ris hydrogen, from the solution of step f).