Abstract
Liberation of fermentable sugars from lignocellulosic biomass is one of the key challenges in production ofcellulosic ethanol. Aqueous ammonia cleaves ether and ester bonds in lignin carbohydrate complexes. It is an effectiveswelling reagent for lignocellulosic biomass. The aqueous ammonia pretreatment selectively reduces the lignin contentof biomass. However, at high temperatures, this process solubilizes more than 50% of the hemicellulose in the biomass.Here we conducted a SAA(Soaking in Aqueous Ammonia) process by moderate reaction temperatures at atmosphericpressure using various lignocellulosicbiomass. The optimum condition of this process was 15 wt% of aqueous ammoniaat 50 of reaction time during 72 hr. The delignification was up to 60% basis on initial biomass and the enzymatic digest-ibility was 60~90% for agricultural biomass, respectively. Key words: Biomass Pretreatment, SAA, Enzymatic Hydrolysis, Bio Ethanol
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