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Title: Kinetic features of xylan de-polymerization in production of xylose monomer and furfural during acid pretreatment for kenaf, forage sorghums and sunn hemp feedstocks

A kinetic study of acid pretreatment was conducted for sorghum non-brown mid rib (SNBMR) ( Sorghum bicolor L Moench), sorghum-brown mid rib (SBMR), sunn hemp ( Crotalaria juncea L) and kenaf ( Gossypiumhirsutum L), focusing on rates of xylose monomer and furfural formation. The kinetics was investigated using two independent variables, reaction temperature (150 and 160°C) and acid concentration (1 and 2 wt%), with a constant dry biomass loading of 10 wt% and a treatment time up to 20 min while sampling the mixture every 2 min. The experimental data were fitted using a two-step kinetic model based on irreversible pseudo first order kinetics at each step. Varied kinetic orders on the acid concentration, ranging from 0.2 to >3, were observed for both xylose and furfural formation, the values depending on the feedstock. The crystallinity index of raw biomass was shown to be a major factor influencing the rate of both xylose and furfural formation. As a result, a positive correlation was observed between the activation energy and biomass crystallinity index for xylose formation.
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. Univ. of North Dakota, Grand Forks, ND (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
NREL/JA-5100-63046
Journal ID: ISSN 1934-6352
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
International Journal of Agricultural and Biological Engineering
Additional Journal Information:
Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 1934-6352
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANAYLYTICAL CHEMISTRY; acid pretreatment; sunn hemp; sorghum brown-mid rib (BMR); sorghum non brown-mid rib (SNBMR); kenaf; reaction kinetics; activation energy; reaction order
OSTI Identifier:
1242468