Hemicellulose Recovery from Rice Straw using Dilute Sulfuric Acid

Rice straw was pretreated using dilute sulfuric acid at reaction conditions covering two levels of reaction temperature (140, $150^{\circ}C$) and five levels of acid concentrations ($1.0{\sim}3.0%wt$). The production and decomposition rates of major components of rice straw indicating glucose, xylose, galactose and arabinose were investigated. The production rate of arabinose and the decomposition rate of xylose were greatest among them. The maximum attainable hemicellulose (xylose+galactose+arabinose) yield was about 80%. High acid concentration appears to favor the maximum yield but high temperature does not. The optimum condition was found to be $140^{\circ}C$, 2.5% and 20 minutes. The maximum glucose yields were almost same, around $16{\sim}18%$, regardless of reaction conditions.

묽은 황산을 사용하여 볏짚으로부터 헤미셀룰로오스 회수

희석 황산용액을 사용해 볏짚을 전처리했는데 반응조건은 2개의 반응온도(140, $150^{\circ}C$)와 5개의 황산농도($1.0{\sim}3.0 %wt$)를 사용했다. 볏짚을 구성하는 주요성분인 glucose, xylose, galactose와 arabinose의 생성과 분해속도를 조사했는데 생성속도는 arabinose, 분해속도는 xylose가 가장 컸다. 헤미셀룰로오스당 (xylose+galactose+arabinose)의 최고수율은 약 80%이었는데 최고수율에 도달하는데 산 농도가 높은 것은 유리하지만 반응온도가 높은 것은 불리하게 나타났다. 최적조건은 $140^{\circ}C$, 2.5%와 20분이었다. 최고 glucose 수율은 반응조건에 관계없이 거의 같았는데 대략 $16{\sim}18%$ 범위였다.