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Recovery of value-added compounds through fast pyrolysis of apple pomace hydrochar.

Authors :
Karod, Madeline
Orton, Kellene A.
Elkasabi, Yaseen
Mullen, Charles A.
Harman-Ware, Anne E.
Iisa, Kristiina
Goldfarb, Jillian L.
Source :
Journal of Analytical & Applied Pyrolysis. Jan2025, Vol. 185, pN.PAG-N.PAG. 1p.
Publication Year :
2025

Abstract

The environmental challenges associated with food production can be addressed via the thermochemical upcycling of agro-industrial biomass. Two such methods, hydrothermal carbonization (HTC) and pyrolysis, can be coupled to first reduce the water content of wet biomass wastes by producing a hydrochar (HC) via HTC and then a bio-oil via pyrolysis of the HC. However, HTC of biomass results in the formation of secondary char (SC), an amorphous tar-like mixture resulting from organic compounds released into the aqueous phase that adsorb, recondense and polymerize on the parent biomass. This study investigated how HTC temperature impacts the formation of SC from apple pomace and the SC's subsequent impact on fast pyrolysis products. HCs were produced at temperatures of 175°C, 200°C, and 250°C. Lower HTC temperatures favor the formation of biorefinery platform chemicals such as 5-hydroxymethylfurfural and levulinic acid, while higher temperatures result in increased lignin degradation products (i.e., phenolics). HCs were subjected to fast pyrolysis before and after SC extraction in two analytical pyrolysis instruments. Fast pyrolysis of HC produced compounds similar to those found in SC, but with variations in CO and CO 2 emissions. The combination of SC extraction and fast pyrolysis demonstrates promise for recovering value-added compounds from agro-industrial waste biomass while retaining a solid char for fuel and carbon management. • Identified products of hydrochar fast pyrolysis using py-GC-MS/FID/TCD and py-MBMS. • Secondary char (SC) inhibits pyrolytic reactions on surface of hydrochar. • Char post-SC extraction had increased surface area, more pyrolytic reactions. • SC contains value-added compounds like 5-hydroxymethylfurfural and levulinic acid. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
01652370
Volume :
185
Database :
Academic Search Index
Journal :
Journal of Analytical & Applied Pyrolysis
Publication Type :
Academic Journal
Accession number :
181409351
Full Text :
https://doi.org/10.1016/j.jaap.2024.106868