Tuesday, April 20, 2010
8-87

Pretreatment of Miscanthus using acid and aqueous ammonia process/percolation

Yong Cheol Park1, Ji Ho Seo1, Jin-Woo Kim2, Kyeong Keun Oh3, and Jun Seok Kim1. (1) Department of Chemical Engineering, Kyonggi University, 94-6 Yiui-dong Yeongtong-gu, Suwon, South Korea, (2) SAIT, South Korea, (3) Applied Chemical Engineering, Dankook University, San-29, Anseo-dong, Cheonan, South Korea

The bio-ethanol has recently received much attention as an alternative energy. Generally the bio-ethanol is produced by fermenting the glucose obtained from biomass. The typical raw materials for bio-ethanol are biomass such as a sugar cane, wheat, corns, potato, barley, and a sweet potato. The bio-ethanol is renewable because raw materials are obtained from plants. Compare to the gasoline discharging pollutants like carbon monoxide, the bio-ethanol is entirely not exhaust hazardous substance. Bioprocesses for converting lignocellulose to useful materials such as liquid fuels and chemicals have been receiving increasing attention. Pretreatment is an essential element in the bioconversion of lignocellulosic substrates. The pretreatment of lignocellulosic is primarily employed to increase the accessible surface area of cellulose to enhance the conversion of cellulose to glucose. The advantage of acid pretreatment is the solubilization of hemicellulose and by this, making the cellulose more easily accessible for the enzymes. The cellulose, hemicellulose and lignin of the selective separation are a necessary step in order for high-yield production of Bio-ethanol. The hemicellulose is separated through acid pretreatment process. And then cellulose and lignin are separated through alkaline, respectively. First, acid concentration in acid pretreatment process is in the range of 1~10% that byproducts like a HMF and furfural are less produced concentration. Second, alkaline pretreatment process is used aqueous ammonia. Pretreatment conditions are temperature of 100~180°C, Reaction time of 10~60 min. In this research, we can found the optimum conditions of two-stage pretreatment. Then we confirmed that glucose conversion rate by enzymatic hydrolysis of pretreated substrate.

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