원문정보
초록
영어
Recently, we have studied on the liquefaction of waste newspaper using ethylene glycol (1). From the results, cellulose, lignin and hemicellulose were removed by approximately 10%, 84% and 70% based on initial content at 10 minutes, respectively. This means that most of lignin and hemicellulose can be removed while keeping cellulose intact, and indicates that ethylene glycol can be used as a pretreatment reagent under proper reaction conditions. Pretreatment by
ethylene glycol does not need high pressure equipment because of its high boiling point (197.6℃), whereas conventional pretreatment by aqueous liquor does. The major parameters to affect on pretreatment performance are temperature, acid concentration, and reaction time. To
compare the pretreatment performance of a reaction with other’s, a unified parameter that combines temperature, acid concentration, and reaction time, called as severity parameter, can be used. Since the pH of nonaqueous solvent like ethylene glycol cannot be measured, we
modified Chum et al.’s equation (2) by replacing hydrogen ion concentration with sulfuric acid concentration (% weight). The result indicated that severity factor could be well correlated with the removal of cellulose, hemicellulose and lignin, and enzymatic digestibility,
respectively.