Oxidative Lime Pretreatment of Dacotah Switchgrass |
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Authors: | Matthew Falls Rocio Sierra-Ramirez Mark T Holtzapple |
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Institution: | 1.Texas A&M University,College Station,USA;2.Grupo de Conversion de Energia,Universidad de los Andes,Bogotá,Colombia |
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Abstract: | Oxidative lime pretreatment increases the enzymatic digestibility of lignocellulosic biomass primarily by removing lignin.
In this study, recommended pretreatment conditions (reaction temperature, oxygen pressure, lime loading, and time) were determined
for Dacotah switchgrass. Glucan and xylan overall hydrolysis yields (72 h, 15 FPU/g raw glucan) were measured for 105 different
reaction conditions involving three different reactor configurations (very short term, short term, and long term). The short-term
reactor was the most productive. At the recommended pretreatment condition (120 °C, 6.89 bar O2, 240 min), it achieved an overall glucan hydrolysis yield of 85.2 g glucan hydrolyzed/100 g raw glucan and an overall xylan
yield of 50.1 g xylan hydrolyzed/100 g raw xylan. At this condition, glucan oligomers (1.80 g glucan recovered/100 g glucan
in raw biomass) and xylan oligomers (25.20 g xylan recovered/100 g xylan in raw biomass) were recovered from the pretreatment
liquor, which compensate for low pretreatment yields. |
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Keywords: | |
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