Method for the isolation of vanillin from lignin in alkaline...

Details Method for the isolation of vanillin from lignin in alkaline... Method for the isolation of vanillin from lignin in alkaline...

C - Chemistry, Metallurgy

07

C

260/574

C07C 47/58 (2006.01) B01J 47/00 (2006.01) C07C 45/79 (2006.01)

Patent

CA 1169093

- 0 - ABSTRACT This invention relates to a method for the separation of low molecular-weight aromatic compounds, e.g. vanillin and dehydrodivanillin, from lignin, alkali, and from each other, in alkaline aqueous solutions. According to the method, the separation is effected by means of a cationic ion-exchange resin in its sodium salt form, e.g. of a strong sulphonic acid type or weak carbonic acid type, from which the substances adsorbed are removed by elution. The resin may be crosslinked to the extent of 2 - 16 % divinylbenzene. The substances adsorbedonto the ion-exchange resin are appropriately eluted by either water alone, or by application of an aqueous sodium-salt solution (e.g. Na2CO3) followed by water.

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