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Acid-catalyzed hydrothermal severity on the fractionation of agricultural residues for xylose-rich hydrolyzates.

Bioresource technology (2013-02-12)
Ji Ye Lee, Hyun Jin Ryu, Kyeong Keun Oh
ABSTRACT

The objective of this work was to investigate the feasibility of acid-catalyzed hydrothermal fractionation for maximum solubilization of the hemicellulosic portion of three agricultural residues. The fractionation conditions converted into combined severity factor (CS) in the range of 1.2-2.9. The highest hemicellulose yield of 87.88% was achieved when barley straw was fractionated at a CS of 2.19. However, the maximum glucose release of 15.29% was achieved for the case of rice straw. The maximum productions of various by-products were observed with the fractionation of rape straw: 0.88 g/L of 5-hydroxymethylfurfural (5-HMF), 2.16 g/L of furfural, 0.44 g/L of levulinic acid, 1.59 g/L of formic acid, and 3.06 g/L of acetic acid. The highest selectivities, a criterion for evaluating the fractionation of 21.55 for fractionated solid and 7.48 for liquid hydrolyzate were obtained from barley straw.

MATERIALS
Product Number
Brand
Product Description

Supelco
Ammonium formate, eluent additive for LC-MS, LiChropur, ≥99.0%
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Formic acid, reagent grade, ≥95%
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Formic acid, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥98%
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Furfural, 99%
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Formic acid, ACS reagent, ≥96%
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Ammonium formate, ≥99.995% trace metals basis
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Ammonium formate, reagent grade, 97%
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Formic acid, puriss., meets analytical specifications of DAC, FCC, 98.0-100%
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5-(Hydroxymethyl)furfural, ≥99%, FG
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5-Hydroxymethyl-2-furaldehyde, 99%
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5-(Hydroxymethyl)furfural, analytical standard
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Ammonium formate solution, BioUltra, 10 M in H2O
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Ammonium formate, BioUltra, ≥99.0% (calc. based on dry substance, NT)
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Sodium formate, BioUltra, ≥99.0% (NT)
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Levulinic acid, 98%
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Sodium formate, ACS reagent, ≥99.0%
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Formic acid, ACS reagent, ≥88%
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Potassium formate, ReagentPlus®, 99%
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Levulinic acid, ≥97%, FG
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Furfural, ≥98%, FCC, FG
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Formic acid, ≥95%, FCC, FG
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Furfural, natural, ≥98%, FCC, FG
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Sodium formate, reagent grade, 97%
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Calcium formate, BioUltra, ≥99.0% (T)
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Furfural, ACS reagent, 99%
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Formic acid solution, BioUltra, 1.0 M in H2O
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Levulinic acid, natural, 99%, FG
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Calcium formate, Standard for quantitative NMR, TraceCERT®
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Cesium formate, 98%
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Sodium formate, 99.998% trace metals basis