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Rapid quantification and characterization of the pyrolytic lignin fraction of bio-oils by size exclusion chromatography coupled with multi-angle laser light scattering detector (SEC-MALS)

Ruiz M., Valette J., Broust F., Bonfils F.. 2019. Journal of Analytical and Applied Pyrolysis, 142 : 8 p..

A rapid method was developed to characterize the Pyrolytic Lignin (PL) fraction of flash pyrolysis bio-oils, based on size exclusion chromatography (SEC) coupled to differential refractive index (DRI) and multi-angle laser light scattering (MALS) detectors. Two beech wood bio-oils with different PL content were used in the study. The first was produced with a single-stage condensation system (BO), while the second was an organic fraction collected in the first stage of a two-stage condensation system (F1). PL was isolated from both the BO and F1 bio-oils by the water precipitation method. Our results suggested that quantification of the pyrolytic lignin fraction of bio-oils can be performed by the SEC-MALS-DRI method provided that the specific refractive index increment (dn/dc) is known, and the integration interval is carefully chosen. Average molar mass (Mn) values for the BO and F1 samples were 580?±?50?Da and 890?±?50?Da, respectively. Our results indicated that the condensation system and the water precipitation method affect the average molar mass of isolated PL oligomers.

Mots-clés : pyrolyse; bioénergie; pyrolyse flash

Thématique : Sources d'énergie renouvelable; Technologie des produits forestiers; Méthodes de recherche

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