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곽기섭,윤채휘,김종찬,김종화,조영민,최인규 한국목재공학회 2022 목재공학 Vol.50 No.6
The objective of this study was to understand the conversion characteristics of glucose and xylose using the major monosaccharide standards for lignocellulosic biomass. The acid-catalyzed organosolv pretreatment conducted using ethanol was significantly different from the acid-catalyzed process conducted in an aqueous medium. 5-hydroxymethylfurfural (5-HMF), levulinic acid and furfural were produced from glucose conversion. The maximum yield of 5-HMF was 5.5%, at 200℃, when 0.5% sulfuric acid was used. The maximum yield of levulinic acid was 21.5%, at 220℃, when 1.0% sulfuric acid was used. Furfural was produced from xylose conversion and under 0.5% sulfuric acid, furfural reached the maximum yield 48.5% at 210℃. Ethyl levulinate and methyl levulinate were also formed from the glucose standard following the esterification reaction conducted under conditions of the combined conversion method, which proceeded under both ethanol-rich and water-rich conditions.
곽기섭,신준호,윤채휘,최인규 한국목재공학회 2024 목재공학 Vol.52 No.3
The conversion characteristics of the major components of Liriodendron tulipifera were investigated during acid-catalyzed organosolv pretreatment. Glucan in L. tulipifera was slowly hydrolyzed, whereas xylan was rapidly hydrolyzed. Simultaneous hydrolysis and degradation of xylan and lignin occurred; however, after complete hydrolysis of xylan at higher temperatures, lignin remained and was not completely degraded or solubilized. These conversion characteristics influence the structural properties of glucan in L. tulipifera. Critical hydrolysis of the crystalline regions in glucan occurred along with rapid hydrolysis of the amorphous regions in xylan and lignin. Breakdown of internal lignin and xylan bonds, along with solubilization of lignin, causes destruction of the lignin-carbohydrate complex. Over a temperature of 160℃, the lignin that remained was coalesced, migrated, and re-deposited on the surface of pretreated solid residue, resulting in a drastic increase in the number and content of lignin droplets. From the results, the characteristic conversions of each constituent and the changes in the structural properties in L. tulipifera effectively improved enzymatic hydrolysis in the range of 140℃–150℃. Therefore, it can be concluded that significant changes in the biomass recalcitrance of L. tulipifera occurred during organosolv pretreatment.
리그노셀룰로오스 바이오매스로부터 묽은 산 처리를 통한 고부가가치 빌딩 블록 화합물의 생산
조영민 ( Cho Young-min ),김종화 ( Jong-hwa Kim ),김종찬 ( Jong-chan Kim ),윤채휘 ( Chae-hwi Yoon ),김다예 ( Daye Kim ),윤혜선 ( Hye-sun Yoon ),최인규 ( In-gyu Choi ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
본 연구에서는 졸참으로부터 산 처리를 통해 푸르푸랄, 5-HMF 및 레불린산을 생산하고 수율을 평가하고자 하였다. 조건은 0.1%, 0.5%, 1% 황산에 170, 180, 190, 200, 210 ℃ 온도 조건에서 반응을 진행하였다. 세 화합물 모두 0.1% 조건에서 온도가 증가함에 따라 수율이 증가하는 경향을 보이나 0.5%, 1% 조건에서 레불린산은 증가하는 경향, 5-HMF는 증가하다가 감소, 푸르푸랄은 180 ℃에서 최고점을 보였다.
김종화 ( Jong-hwa Kim ),김종찬 ( Jong-chan Kim ),조영민 ( Young-min Cho ),윤채휘 ( Chae-hwi Yoon ),김다예 ( Daye Kim ),여환명 ( Hwanmeyong Yeo ),최인규 ( In-gyu Choi ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
본 연구에서는 글루코오스의 질산 산화를 통해 글루카르산을 생산하고 생산 조건에 따른 글루카르산 생산 양상을 분석하였다. 글루코오스 수용액은 다양한 농도로 구배되었으며 질산의 경우 글루코오스 몰수 대비 4배를 투입하였다. 그 결과 질산수용액의 농도가 높을수록 글루카르산의 수율이 증가하였으며 글루코오스 수용액의 농도가 낮을 경우 반응온도가 높아지거나 질산 투입량이 증가해야 질산 산화가 진행되었다.