Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Kinetic Study of Xylan Hydrolysis and Decomposition in Concentrated Sulfuric Acid Hydrolysis Process by $^1H$-NMR Spectroscopy

$^1H$-NMR에 의한 Xylan의 황산가수분해 과정에서 나타나는 반응 동력학 연구

  • Cho, Dae-Haeng (Department of Chemical Engineering, Kwangwoon University) ;
  • Kim, Yong-Hwan (Department of Chemical Engineering, Kwangwoon University) ;
  • Kim, Byung-Ro (Department of Biobased Materials, Chungnam National University) ;
  • Park, Jong-Moon (Department of Biobased Materials, Chungnam National University) ;
  • Sung, Yong-Joo (Department of Wood and Paper Science, Chungbuk National University) ;
  • Shin, Soo-Jeong (Department of Biobased Materials, Chungnam National University)
  • 조대행 (광운대학교 공과대학 화학 공학과) ;
  • 김용환 (광운대학교 공과대학 화학 공학과) ;
  • 김병로 (충북대학교 농업생명환경대학 목재종이과학과) ;
  • 박종문 (충북대학교 농업생명환경대학 목재종이과학과) ;
  • 성용주 (충남대학교 농업생명대학 환경재료 공학과) ;
  • 신수정 (충북대학교 농업생명환경대학 목재종이과학과)
  • Received : 2011.07.29
  • Accepted : 2011.08.22
  • Published : 2011.09.30
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Abstract

Proton-NMR spectroscopic method was applied to kinetic study of concentrated sulfuric acid hydrolysis reaction, especially focused on 2nd step of acid hydrolysis with deferent reaction time and temperature as main variables. Commercial xylan extracted from beech wood was used as model compound. In concentrated acid hydrolysis, xylan was converted to xylose, which is unstable in 2nd hydrolysis condition, which decomposed to furfural or other reaction products. Without neutralization steps, proton-NMR spectroscopic analysis method was valid for analysis of not only monosaccharide (xylose) but also other reaction products (furfural and formic acid) in acid hydrolyzates from concentrated acid hydrolysis of xylan, which was the main advantages of this analytical method. Higher temperature and longer reaction time at 2nd step acid hydrolysis led to less xylose concentration in xylan acid hydrolyzate, especially at $120^{\circ}C$ and 120 min, which meant hydrolyzed xylose was converted to furfural or other reaction products. Loss of xylose was not match with furfural formation, which meant part of furfural was degraded to other undetected compounds. Formation of formic acid was unexpected from acidic dehydration of pentose, which might come from the glucuronic acid at the side chain of xylan.

Keywords

References

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