원문정보
초록
영어
Nowadays, the price of fossil fuels and the amount of carbon dioxide generated are rapidly increasing due to the excessive use of fossil fuels. Therefore, a great deal of effort has been made to develop novel techniques to convert renewable resources into fuel and chemicals which can be used as substitutes for fossil fuels and their derivatives. One of these efforts involves lignocellulosic biomass, which is one of the most plentiful resources in the world, but whose utilization has been very limited because of the lack of processing techniques. The liquefaction of lignocellulosic materials is carried out in the presence of some organic solvents to produce polyurethane, epoxy resin, polyester, etc. Since thisprocess is performed under atmospheric pressure, many advantages may exist for its commercial utilization. Wastepaper is one of the most plentiful feedstocks and is relatively well recycled. It could be used as a raw material for bioethanol by hydrolyzing it enzymatically to glucose. However, it is not easy to increase
the enzymatic digestibility due to the presence of ink and the other chemicals used in the pulping process. In the case liquefaction, however, ink removal is not necessary. The major objectives of this study are to measure the liquefaction yield and the degradation rates of cellulose, hemicellulose, and lignin, which are the major components of newspaper. Liquefaction was carried out in the presence of polyhydric alcohols and ethylene carbonate under acidic
conditions. The liquefaction yield was found to be a function of the solvent type, sulfuric acid concentration, temperature, and the ratio of solvent to newspaper.
The total liquefaction rate and degradation rates of cellulose, hemicellulose and lignin, which are the major components of newspaper, were measured. From the results, it was found that the total liquefaction rate did not follow first order reaction kinetics, because of the difference in the degradation rate of each component and the condensation of lignin. The degradation rates of lignin and hemicellulose were approximately 13 and 7 times greater than that of cellulose,
respectively.