백합나무 목분으로 고농도 단당류를 생산하기 위하여 진한 황산을 사용하는 산 가수분해 특성을 연구하였다. 목분과 황산의 비율을 달리하거나 2차 가수분해의 온도와 시간을 달리하여 당화액 제조의 최적 조건을 탐구한 결과, 1차 가수분해의 목분과 72% 황산 비율은 1 : 2.61(w/w)였으며, 2차 가수분해 온도와 시간은 $105^{\circ}C$에서 70분 가수분해 조건이었다. 이때 생성된 당화액의 농도는 glucose가 44.8 g/L였고 xylose는 25.2 g/L였다. 산 가수분해를 통하여 얻어진 당화액을 발효할 때 발효 저해물질로 알려진 furfural, 5-HMF (5-hydroxymethylfurfural), 저분자량 페놀성 화합물들이 생성되었는데 furfural과 5-HMF는 2차 가수분해 온도가 높아짐에 따라, 그리고 반응시간이 길어짐에 따라 생성량이 증가하였다. $110^{\circ}C$ 2차 가수분해 조건에서 반응시간이 40분을 지남에 따라서 xylose농도는 감소하였고 glucose 농도는 일정하였는데, xylose는 생성속도보다 furfural로 전이 속도가 더 빠른 것으로 생각되고, glucose의 경우 생성속도와 5-HMF로 전이속도가 비슷하여 농도가 일정하게 나타났다.
백합나무 목분으로 고농도 단당류를 생산하기 위하여 진한 황산을 사용하는 산 가수분해 특성을 연구하였다. 목분과 황산의 비율을 달리하거나 2차 가수분해의 온도와 시간을 달리하여 당화액 제조의 최적 조건을 탐구한 결과, 1차 가수분해의 목분과 72% 황산 비율은 1 : 2.61(w/w)였으며, 2차 가수분해 온도와 시간은 $105^{\circ}C$에서 70분 가수분해 조건이었다. 이때 생성된 당화액의 농도는 glucose가 44.8 g/L였고 xylose는 25.2 g/L였다. 산 가수분해를 통하여 얻어진 당화액을 발효할 때 발효 저해물질로 알려진 furfural, 5-HMF (5-hydroxymethylfurfural), 저분자량 페놀성 화합물들이 생성되었는데 furfural과 5-HMF는 2차 가수분해 온도가 높아짐에 따라, 그리고 반응시간이 길어짐에 따라 생성량이 증가하였다. $110^{\circ}C$ 2차 가수분해 조건에서 반응시간이 40분을 지남에 따라서 xylose농도는 감소하였고 glucose 농도는 일정하였는데, xylose는 생성속도보다 furfural로 전이 속도가 더 빠른 것으로 생각되고, glucose의 경우 생성속도와 5-HMF로 전이속도가 비슷하여 농도가 일정하게 나타났다.
We investigated acid hydrolysis characteristics of yellow poplar woodmeal with concentrated sulfuric acid for high concentration of monosaccharides production. Woodmeal to 72% sulfuric acid ratio (w/w), $2^{nd}$ hydrolysis temperature and time were main variables for finding optimum react...
We investigated acid hydrolysis characteristics of yellow poplar woodmeal with concentrated sulfuric acid for high concentration of monosaccharides production. Woodmeal to 72% sulfuric acid ratio (w/w), $2^{nd}$ hydrolysis temperature and time were main variables for finding optimum reaction condition. Optimum woodmeal to 72% sulfuric acid ratio was 1 : 2.61 (w/w) and $2^{nd}$ hydrolysis temperature and time was $105^{\circ}C$ and 40 min as 44.8 g/L of glucose and 25.2 g/L of xylose in hydrolysis solution. In this acid hydrolysis solution, furfural, 5-HMF, low molecular weight phenolic compounds were identified. Furfural and 5-HMF concentration were increased as increasing $2^{nd}$ hydrolysis time. More than 40 min of $2^{nd}$ hydrolysis at $110^{\circ}C$, xylose concentration was decreased but glucose concentration was leveled out because xylose to furfural reaction was faster than xylan to xylose, but cellulose to glucose reaction was similar rate with glucose to 5-HMF at that $2^{nd}$ hydrolysis reaction condition.
We investigated acid hydrolysis characteristics of yellow poplar woodmeal with concentrated sulfuric acid for high concentration of monosaccharides production. Woodmeal to 72% sulfuric acid ratio (w/w), $2^{nd}$ hydrolysis temperature and time were main variables for finding optimum reaction condition. Optimum woodmeal to 72% sulfuric acid ratio was 1 : 2.61 (w/w) and $2^{nd}$ hydrolysis temperature and time was $105^{\circ}C$ and 40 min as 44.8 g/L of glucose and 25.2 g/L of xylose in hydrolysis solution. In this acid hydrolysis solution, furfural, 5-HMF, low molecular weight phenolic compounds were identified. Furfural and 5-HMF concentration were increased as increasing $2^{nd}$ hydrolysis time. More than 40 min of $2^{nd}$ hydrolysis at $110^{\circ}C$, xylose concentration was decreased but glucose concentration was leveled out because xylose to furfural reaction was faster than xylan to xylose, but cellulose to glucose reaction was similar rate with glucose to 5-HMF at that $2^{nd}$ hydrolysis reaction condition.
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