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林产化学与工业 ›› 2021, Vol. 41 ›› Issue (6): 97-104.doi: 10.3969/j.issn.0253-2417.2021.06.013

• 研究报告 • 上一篇    下一篇

纳米木质素的热解特性及其反应动力学分析

田杰1, 娄瑞1,*(), 薛香玉1, 张宏1, 武书彬2, 许慧敏3   

  1. 1. 陕西科技大学 机电工程学院, 陕西 西安 710021
    2. 华南理工大学 轻工科学与工程学院, 广东 广州 510640
    3. 山东世纪阳光纸业集团有限公司, 山东 潍坊 262400
  • 收稿日期:2020-12-01 出版日期:2021-12-28 发布日期:2021-12-31
  • 通讯作者: 娄瑞 E-mail:lourui@sust.edu.cn
  • 作者简介:娄瑞, 副教授, 硕士生导师, 研究领域为木质纤维生物质高值化转化利用; E-mail: lourui@sust.edu.cn
    田杰(1994-), 女, 陕西咸阳人, 硕士生, 研究方向为生物质转化利用
  • 基金资助:
    国家自然科学基金资助项目(31700512);陕西省大学生创新训练项目(S202010708105);广州市科技局基础研究计划项目(202002030157)

Thermal Degradation Characteristics of Lignin Nanoparticles and Its Reaction Kinetics Analysis

Jie TIAN1, Rui LOU1,*(), Xiangyu XUE1, Hong ZHANG1, Shubin WU2, Huimin XU3   

  1. 1. College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
    2. School of Light Industry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
    3. Shandong Century Sunshine Paper Group Co. Ltd., Weifang 262400, China
  • Received:2020-12-01 Online:2021-12-28 Published:2021-12-31
  • Contact: Rui LOU E-mail:lourui@sust.edu.cn

摘要:

借助低共熔溶剂(DES)对松木原料在不同温度下进行DES-木质素的提取,将100、130、150 ℃处理温度下得到的纳米级DES-木质素分别标记为L100、L130和L150;分析了DES-木质素的得率及元素组成,并采用快速热解和热重分析法等技术研究所得纳米级DES-木质素的热降解特性。研究表明:L100、L130和L150的得率分别为33.53%、81.02%和82.62%,DES-木质素具有较低的H/C物质的量比。DES处理松木的反应温度对纳米木质素热降解特性具有显著影响,随着DES处理温度的升高热解焦炭的得率逐渐增加,且700 ℃下快速热解可得到高热值(30.97~31.96 MJ/kg)且介孔相对均一的焦炭。TG分析表明DES-木质素发生热降解的主反应温区在200~450 ℃,最大失重峰温度分别在265和385 ℃左右。采用非等温Coats-Redfern积分法对DES-木质素热解反应进行动力学拟合显示,DES-木质素热解在主反应温区(200~450 ℃)为二级动力学反应,其中,L100、L130和L150在200~300 ℃温度区间的热解反应活化能为51.52~52.13 kJ/mol,在330~450 ℃温度区间的热解反应活化能为32.65~49.25 kJ/mol。

关键词: 低共熔溶剂, 纳米木质素, 焦炭, 动力学

Abstract:

DES-lignin was extracted from pine feedstock by using deep eutectic solvents(DES) at treatment temperatures of 100, 130, and 150 ℃, and the resultant DES-lignin samples with nano scale were labeled as L100, L130, and L150, respectively. The yields and elemental compositions of DES-lignin were determined, and the thermal degradation characteristics of nanoscale DES-lignin were studied by fast pyrolysis and thermogravimetric analysis(TGA). The results showed that the yields of L100, L130 and L150 were 33.53%, 81.02% and 82.62%, respectively, along with lower H/C molar ratio. DES treatment temperatures of pine wood had significant effect on the thermal degradation properties of lignin nanoparticles. With the increment of DES treatment temperature, the yields of biochar derived from DES-lignin pyrolysis gradually increased, and biochar obtained by fast pyrolysis at 700 ℃ had great high calorific value(30.97-31.96 MJ/kg) and homogeneous mesoporous. Besides, TG analysis indicated that the intense pyrolysis reaction of DES-lignin took place mainly ranged from the temperature of 200 to 500 ℃, the peak temperatures of the maximum weight loss rate occurred around 265 and 385 ℃, respectively. In addition, non-isothermal Coats-Redfern integration method was used to fit the reaction kinetics of DES-lignin pyrolysis, which demonstrated that DES-lignin pyrolysis was a secondary kinetic reaction in the main reaction temperature zone(200-450 ℃), and the obtained activation energy of L100, L130 and L150 pyrolysis ranged 51.52-52.13 kJ/mol during temperature from 200 to 300 ℃ as well as 32.65-49.25 kJ/mol during temperature from 330 to 450 ℃.

Key words: deep eutectic solvent, lignin nanoparticle, biochar, kinetics

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