Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Analysis of Carbonization Behavior of Hydrochar Produced by Hydrothermal Carbonization of Lignin and Development of a Prediction Model for Carbonization Degree Using Near-Infrared Spectroscopy

열수 탄화 공정을 거친 리그닌 하이드로차(hydrochar)의 탄화 거동 분석과 근적외선 분광법을 이용한 예측 모델 개발

  • HWANG, Un Taek (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • BAE, Junsoo (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • LEE, Taekyeong (Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • HWANG, Sung-Yun (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • KIM, Jong-Chan (Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Sciences, Seoul National University) ;
  • PARK, Jinseok (Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Sciences, Seoul National University) ;
  • CHOI, In-Gyu (Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • KWAK, Hyo Won (Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • HWANG, Sung-Wook (Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • YEO, Hwanmyeong (Research Institute of Agriculture and Life Sciences, Seoul National University)
  • Received : 2021.03.10
  • Accepted : 2021.03.31
  • Published : 2021.05.25
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Abstract

In this paper, we investigated the carbonization characteristics of lignin hydrochar prepared by hydrothermal carbonization and established a model for predicting the carbonization degree using near-infrared spectroscopy and partial least squares regression. The carbon content of the hydrothermally carbonized lignin at the temperature of 200 ℃ was higher by approximately 3 wt% than that of the untreated sample, and the carbon content tended to gradually increase as the heating time increased. Hydrothermal carbonization made lignin more carbon-intensive and more homogeneous by eliminating the microparticles. The discriminant and predictive models using near-infrared spectroscopy and partial least squares regression approppriately determined whether hydrothermal carbonization has been applied and predicted the carbon content of hydrothermal carbonized lignin with high accuracy. In this study, we confirmed that we can quickly and nondestructively predict the carbonization characteristics of lignin hydrochar manufactured by hydrothermal carbonization using a partial least squares regression model combined with near-infrared spectroscopy.

본 논문에서는 열수 탄화(hydrothermal carbonization)에 의해 제조된 리그닌 하이드로차의 탄화 특성을 조사하였고, 근적외선 분광법과 부분 최소 제곱(partial least squares) 회귀를 이용하여 탄화 거동을 예측하기 위한 모델을 수립하였다. 온도 200℃에서 열수 탄화된 리그닌의 탄소 함량은 무처리 시료 보다 약 3 wt% 높았으며 가열 시간이 증가할수록 탄소 함량도 서서히 증가하는 경향이 나타났다. 열수 탄화는 리그닌을 더욱 탄소 집약적으로 변화시키고 마이크로 파티클을 제거하여 더욱 균질한 특성을 부여하였다. 근적외선 분광법과 부분 최소 제곱 회귀를 이용한 판별 및 예측 모델은 수열 탄화의 적용 여부를 완벽히 구분했으며 높은 정확도로 열수 탄화 리그닌의 탄소 함량을 예측하였다. 본 연구로부터 근적외선 분광법과 결합된 부분 최소 제곱 회귀 모델을 이용하여 열수 탄화에 의해 제조된 리그닌 하이드로차의 탄화 특성을 빠르고 비파괴적으로 예측할 수 있다는 것이 확인되었다.

Keywords

Acknowledgement

This study was supported by the R&D Program for Forest Science Technology (Project No. 2020215D10-2122-AC01) provided by Korea Forest Service and the BK21 FOUR (Fostering Outstanding Universities for Research) funded by the Ministry of Education (MOE, Korea) and National Research Foundation of Korea (NRF)

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