Method for the isolation of vanillin from lignin in alkaline sol

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

1980-01-24

1981-07-07

Cintins, Ivars C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

210672, 210909, B01D 1504

Patent

active

042776260

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 adsorbed onto the ion-exchange resin are appropriately eluted by either water alone, or by application of an aqueous sodium-salt solution (e.g. Na.sub.2 CO.sub.3) followed by water.

REFERENCES:
patent: 3197359 (1965-07-01), Logan

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