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Thermo‐mechanical extrusion and sodium hydroxide pretreatments for ethanol production from destarched corn fiber
Author(s) -
Myat Lin,
Ryu GiHyung
Publication year - 2014
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12059
Subject(s) - sodium hydroxide , crystallinity , chemistry , extrusion , nuclear chemistry , ethanol fuel , hydrolysis , sodium , enzymatic hydrolysis , degree of polymerization , ethanol , autoclave , fiber , fermentation , materials science , polymerization , food science , organic chemistry , polymer , composite material , crystallography
The effect of thermo‐mechanical extrusion and sodium hydroxide pretreatments on ethanol production from destarched corn fiber (DCF) was investigated. DCF was extruded at screw speed of 300 rpm, feed moisture content of 30%, and melt temperature of 140°C and then pretreated by 0.75, 1.50, 2.25, and 3.00% of sodium hydroxide solution in the autoclave at 121°C for 1 h. After sodium hydroxide pretreatment, the liquid and solid fractions were separated by centrifugation. The dry solid fraction was used for the determination of composition, characterization (crystallinity index, microstructure, degree of polymerization), enzymatic saccharification and fermentation process. Extruded DCF pretreated by 0.75% sodium hydroxide significantly decreased lignin content, crystallinity index and degree of polymerization for efficient enzymatic saccharification and gave significant increase in ethanol yield (35.13 g L −1 ). Therefore, thermo‐mechanical extrusion followed by 0.75% of sodium hydroxide pretreatment was a good pretreatment for ethanol production from DCF. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 823–831, 2015