Homogeneous acetylation of hemicelluloses from soy sauce residue in imidazolium-based ionic liquid

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• 作者：Pengfei Chen ; Hang Song ; Yan Wang…
• 关键词：Hemicelluloses ; Soy sauce residue ; Homogeneous acetylation ; Ionic liquid
• 刊名：Journal of Material Cycles and Waste Management
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：17
• 期：3
• 页码：574-582
• 全文大小：1,355 KB
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• 作者单位：Pengfei Chen (1)
  Hang Song (1)
  Yan Wang (1)
  Pengzhan Chen (1)
  Xin Shen (1)
  Shun Yao (1)
  
  1. School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Waste Management and Waste Technology
  Environmental Management
  Industrial Pollution Prevention
  
• 出版者：Springer Japan
• ISSN：1611-8227

文摘

The acetylation of hemicelluloses isolated from deoiled soy sauce residue by a novel process was achieved in a complete homogeneous imidazolium-based ionic liquid system with acetic anhydride for the first time. The key parameters of acetylation reaction were studied, which included the acetic anhydride/hydroxyl functionality in hemicellulose ratio, reaction time and temperature. The degree of substitution (DS) of acetylated hemicelluloses ranged between 0.67 and 1.68 as a function of experiment conditions. Under the optimal reaction conditions (14:1 molar ratio of acetic anhydride to hydroxyl functionality, 20?min reaction time and 100?°C reaction temperature) developed by orthogonal method, over 90?% hydroxyl groups in hemicelluloses were acetylated. The structural features of the acetylated hemicelluloses were characterized by means of SEM, FT-IR, TG and 13CNMR. The thermal stability of the acetylated hemicelluloses increased upon chemical modification. At the end of acetylation of hemicelluloses, the ionic liquid could be effectively recovered and reused for at least four times with similar DS values. This study presents a promising approach and green process to make use of soy sauce residue and other similar waste materials.