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2025 Vol.57, Issue 1 Preview Page

Research Article

Evaluation of Enhanced Lignin Acetylation Efficiency via Ultrasonication Treatment

초음파 전처리에 따른 리그닌 아세틸화 반응 효율 향상 평가

Na Young Kang1
,
Do Young Lee1
,
Hyoung Jin Kim2†
강 나영1
,
이 도영1
,
김 형진2†
1Dept. of Forest Products & Biotechnology, College of Science and Technology, Kookmin University
2Dept. of Forest Products & Biotechnology, College of Science and Technology, Kookmin University
1국민대학교 과학기술대학 임산생명공학과 학생
2국민대학교 과학기술대학 임산생명공학과 교수
†Corresponding author: E-Mail: hyjikim@kookmin.ac.kr (Address: Dept. of Forest Products & Biotechnology, College of Science and Technology, Kookmin University, Seoul, 02707, Republic of Korea)
28 February 2025. pp. 58-66
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Abstract

Lignin acetylation is a time-consuming process, and long reaction times often lead to the cleavage of ester bond of lignin, resulting in a decrease in the degree of substitution (DS). To improve the efficiency of the lignin acetylation process, an eco-friendly ultrasonication pre-treatment was applied. The degree of substitution of acetyl groups was measured using IR spectroscopy to evaluate and compare the reaction efficiency. The optimal ultrasonication treatment time for controlling lignin particle size was determined to be 60 min, with an average particle size of 13.9 µm. In the case of acetylation of ultrasonicated lignin, the DS of aromatic and aliphatic acetyl groups increased by 17.8% and 36.1%, respectively, compared to untreated lignin, reaching values of 2.05 and 4.6. Notably, there was no reduction in DS due to reverse reactions, even with extended reaction times. Therefore, ultrasonication treatment can be applied as an environment friendly process to reduce particle size and increase specific surface area without catalysts and chemical treatment, thereby enhancing the efficiency of derivative reactions.

Keywords
Kraft lignin
acetylation
ultrasonication
degree of substitution
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Information
  • Publisher :Korea Technical Association of The Pulp and Paper Industry
  • Publisher(Ko) :한국펄프종이공학회
  • Journal Title :Journal of Korea TAPPI
  • Journal Title(Ko) :펄프종이기술
  • Volume : 57
  • No :1
  • Pages :58-66
  • Received Date : 2024-12-10
  • Revised Date : 2025-02-05
  • Accepted Date : 2025-02-05
  • DOI :https://doi.org/10.7584/JKTAPPI.2025.2.57.1.58
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