Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 11, Issue -, Pages 473-480Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.11.53
Keywords
adsorption; electrochemistry; lignin; nickel; renewable resources
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Funding
- Federal Ministry of Food and Agriculture [FKZ 22027208]
- BASF SE
- Deutsche Telekom Stiftung
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The oxidative degradation of lignin into a variety of valuable products has been under investigation since the first half of the last century. Especially, the chance to claim this cheap, abundant and renewable source for the production of the important aroma chemical vanillin (1) was one of the major driving forces of lignin research. So far most of the developed methods fail in technical application since no viable concept for work-up is included. This work represents a combined approach of electrochemical conversion of Kraft lignin and product recovery by adsorption on a strongly basic anion exchange resin. Electrolysis conditions are optimized regarding reaction temperatures below 100 degrees C allowing operation of aqueous electrolytes in simple experimental set-up. Employing ion exchange resins gives rise to a selective removal of low molecular weight phenols from the strongly alkaline electrolyte without acidification and precipitation of remaining lignin. The latter represents a significant advantage compared with conventional workup protocols of lignin solutions.
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