6533b829fe1ef96bd1289894

RESEARCH PRODUCT

Fast pyrolysis of hot-water-extracted and soda-AQ-delignified okra (Abelmoschus esculentus) and miscanthus (miscanthus x giganteus) stalks by Py-GC/MS

Raimo AlénSaleem UllahMaryam Ghalibaf

subject

0106 biological sciencesbiomassa020209 energypyrolysis-gas chromatographySyringol02 engineering and technologyhot-water extractionkuivatislausRaw materialcondensable products01 natural scienceschemistry.chemical_compoundokraerotusmenetelmät010608 biotechnology0202 electrical engineering electronic engineering information engineeringLigninPhenolOrganic chemistrybiomassa (teollisuus)ta116ta215Waste Management and Disposalta218soda-AQ delignificationbiologyRenewable Energy Sustainability and the EnvironmentligniiniForestryMiscanthusbiology.organism_classificationchemistrymiscanthusAbelmoschusGuaiacolAgronomy and Crop SciencePyrolysis

description

Abstract The thermochemical behavior of various samples of okra ( Abelmoschus esculentus ) and miscanthus ( Miscanthus x giganteus ) stalks (initial, hot-water-extracted, and those from sulfur-free delignification) were studied by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). In all cases, major GC-amenable condensable products were measured semi-quantitatively and classified into several product groups. The formation of these product groups from different feedstock samples with varying mass portions of their structural constituents (carbohydrates and lignin) was investigated at 500 °C and 700 °C with a residence time of 5 s and 20 s. The main product groups were aliphatic compounds, such as lactone, furan, and cyclopentenone derivatives from carbohydrates (mainly hemicelluloses) and aromatic compounds, such as guaiacol, phenol, and syringol derivatives from lignin. Additionally, the formation of aliphatic and aromatic products (e.g., the ratio of aliphatic compounds to aromatic compounds) was found to be characteristically dependent on feedstock composition and pyrolysis conditions. This kind of approach is of practical importance concerning efforts not only to uncover new integrated biorefinery possibilities to manufacture value-added products but also to develop rapid characterization tools for lignocellulosics.

https://doi.org/10.1016/j.biombioe.2018.09.001