Vanillin factory

A new electrochemical process could maximize the production of vanillin from lignin, a renewable by-product of the paper pulping process.

Vanillin is one of the world’s most popular aroma chemicals and fragrances. However, 85% of it is synthesized from petrochemical precursors, and the food chemical industry is eager to find more sustainable sources. Researchers have now developed an electrochemical method to obtain vanillin from lignin, a tough biopolymer that is a by-product of the paper industry (ACS Sustainable Chem. Eng. 2020, DOI: 10.1021/acssuschemeng.0c00162).

Lignin, left over after cellulose fibers are removed from wood to make paper, contains a mix of aromatic compounds that chemists have found ways to transform into a range of useful products. In the new study, Siegfried R. Waldvogel of Johannes Gutenberg University Mainz and colleagues created vanillin via a simple reaction. They first dissolved lignin and caustic soda in water and heated the solution. Next, they applied an electric current to the high pH solution using inexpensive nickel electrodes, breaking down the lignin and oxidizing it to produce vanillin in yields of up to 4.7%. “This may not seem impressive, but it is a remarkable selectivity,” Waldvogel says. No toxic or noxious side products are produced.

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