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Hydrothermal Carbonization (HTC) of Lignocellulosic Biomass

Hoekman, S. Kent, Broch, Amber, Robbins, Curtis·2011·Energy & Fuels

Abstract

Hydrothermal carbonization (HTC) of biomass involves contacting raw feedstock with hot, pressurized water. Through a variety of hydrolysis, dehydration, and decarboxylation processes, gaseous and water-soluble products are produced, in addition to water itself and a solid char. In this experimental effort, a 2 L Parr stirred pressure vessel was used to apply the HTC process to a mixed wood feedstock. The effects of the reaction conditions on product compositions and yields were examined by varying temperature over the range of 215−295 °C and varying reaction hold time over the range of 5−60 min. With increasing temperature and time, the amounts of gaseous products and produced water increased, while the amount of HTC char decreased. The energy density of the char increased with reaction severity. At reaction conditions of 255 °C for 30 min, the HTC char had 39% higher energy density than the raw biomass feedstock. Aqueous solutions from HTC experiments at lower temperatures (215−235 °C) contained significant levels of sugars. At higher temperatures (255−295 °C), greatly reduced concentrations of sugars were observed, while concentrations of acetic acid increased. A two-step HTC process involving low- and high-temperature regimes may be advantageous to maximize both the recovery of sugars and production of energy-dense char.

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Metadata

Authors
Hoekman, S. K., Broch, A., & Robbins, C.
Venue
Energy & Fuels
Published
2011-03-22
Volume
25
Issue
4
Pages
1802-1810
ISSN
  • 0887-0624 (ISSN-L)
  • 1520-5029
OpenAlex
W2327467652
Cited by
726
References
7
FWCI
21.15
Type
journal article
Language
en
Open access
closed

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