Abstract
Digestate, the residue following of anaerobic digestion, had attracted great attention recently as potential feedstock of pyrolysis. The results of component analysis verified that digestate was suitable for phenol production due to its considerable lignin content. The thermal degradation of lignin in digestate mainly occurred around 350–450 °C in thermogravimetric analysis. The amorphous cellulose in digestate decomposed to short-chain acids, water and syngas rather than furfural at low temperature around 280 °C. Pyrolysis of digestate for phenol production was conducted under different reaction temperature and pressure. High reaction temperature contributed to phenol formation by facilitating the cleavage reactions of β-O-4 and C–C linkages among three phenylpropane units in lignin. Pyrolysis pressure promoted secondary monomolecular dissociation reactions of methoxyphenol to yield phenol and alkyl-phenol. The maximum phenolics (70.4%) and phenol (42.6%) contents were achieved at 450 °C with 5 MPa pressure in this work.
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