Abstract
Vanillin and acetovanillone are typical primary pyrolysis products of βO4 lignin dimers, but the thermal reactions have not yet been elucidated. Data on their thermal reactivity and secondary pyrolysis pathway was studied via in-situ FTIR within a tube furnace reactor system. The result showed that pyrolysis breakdown products spanned four categories: gas, char, monomers, and polymers and secondary reaction products were polymers and char from re-polymerization and carbonization. In general, vanillin showed higher reactivity than acetovanillone. The removal of the CHO group in vanillin was first observed at 400 °C, to present a thermal reaction similar with guaiacol at higher temperatures. The reactivity of the COCH3 group in acetovanillone was low during the pyrolysis process in which radical-induced rearrangement of the arylOCH3 group into the arylCH3 group initially occurred as the major side-chain-conversion reaction. Finally, side-chain-conversion also included aryl demethylation or demethoxylation, tautomerism of COCH3, and cyclization between arylOCH3 and OH group but at low reaction degrees.
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