Abstract
In this study, the chemical pretreatment method using ethanol organosolv with hydrogen peroxide was investigated to improve enzymatic saccharification of corn stover. The pretreatment method using ethanol with hydrogen peroxide in a flow-through reaction was proposed to lower the reaction severity such as the pretreatment temperature. With the same reaction time, the pretreatment process using organosolv (30 wt.% ethanol) containing 1 wt.% hydrogen peroxide at 150 °C resulted in a similar conversion yield as the result of the alkali pretreatment method using 15 wt.% aqueous ammonia at 170 °C. When corn stover was pretreated with 30 wt.% ethanol solution containing 5 wt.% hydrogen peroxide, a glucose conversion yield of 69.7 wt.% and glucose production of 23.8 g were achieved.
Highlights
Due to its high carbohydrate content, lignocellulosic biomass can be a good source of fermentable sugar for biofuel production [1]
It was confirmed that the remaining solids decreased with increasing hydrogen peroxide concentration in the organosolv pretreatment process
The possibility of a pretreatment method using ethanol and hydrogen peroxide was was investigated for fermentable sugar production
Summary
Due to its high carbohydrate content, lignocellulosic biomass can be a good source of fermentable sugar for biofuel production [1]. In the bioconversion process of lignocellulosic biomass into biofuel such as fuel ethanol, pretreatment is essential and commonly performed to crack the lignin structure and loosen the crystalline structure of cellulose. Lignocellulosic biomass must be transformed to render the cellulose more accessible to enzymes that convert it into fermentable sugars. These sugars can be used as sources in the bioconversion process for the production of biofuels and chemicals. The low cellulose-to-glucose conversion efficiency for lignocellulosic biomass is the result of some primary factors: the close physical and chemical association between carbohydrates and lignin and the crystallinity of the cellulose polymer itself [4]. It is known that chemical pretreatments modify the cellulose structure and crystallinity of lignocellulosic biomass, e.g., cellulose is modified to cellulose III during ammonia pretreatment, whereas organosolv pretreatment generally does not significantly modify the cellulose structure, but it depolymerizes the cellulose and removes amorphous lignin and hemicellulose, resulting in the change of crystallinity [5]
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