Abstract
The objective of this study was to evaluate subcritical water hydrolysis (SWH) of soybean straw and hull for obtaining fermentable sugars in a semi-continuous mode. The experimental conditions investigated were temperature (180, 220 and 260 °C) and liquid/solid mass (R) ratio (9 g and 18 g water/g straw and 7.5 g and 15 g water/g hull). The hydrolysis was performed for 15 min at 25 MPa. The characterization of residues after hydrolysis and reducing sugars yield (YRS), efficiency (E) and composition of hydrolysates were evaluated. The condition of 220 °C/R-18 and R-15 provided the highest YRS of 9.56 ± 0.53 g/100 g straw at 4 min and 10.15 ± 0.50 g/100 g hull at 3 min of hydrolysis. The efficiencies were 23.65 ± 1.32 g/100 g carbohydrates and 23.04 ± 1.14 g/100 g carbohydrates for soybean straw and hull, respectively. SWH modified the structure of the residues and allowed the production of fermentable sugars.
Published Version
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