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林产化学与工业 ›› 2002, Vol. 22 ›› Issue (3): 28-32.

• 研究报告 • 上一篇    下一篇

木材通过亚临界和超临界乙醇萃取的非等温动态转化

钱学仁, 李坚   

  1. 东北林业大学, 材料科学与工程学院, 黑龙江, 哈尔滨, 150040
  • 收稿日期:2001-12-26 修回日期:1900-01-01 出版日期:2002-09-30 发布日期:2002-09-30

NON-ISOTHERMAL DYNAMIC CONVERSION OF WOOD BY SUB-AND SUPERCRITICAL ETHANOL EXTRACTION

QIAN Xue-ren, LI Jian   

  1. College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2001-12-26 Revised:1900-01-01 Online:2002-09-30 Published:2002-09-30

摘要: 在一个半连续实验装置上,采用非等温萃取技术,研究了通过亚临界和超临界乙醇萃取的木材动态转化,主要考察了压力对木材亚临界和超临界乙醇萃取过程的影响。结果表明:木材主要萃取过程可大致分为两个阶段,第一阶段温度范围为200~280℃,在250℃左右萃取物生成速率有极大值。第二阶段温度范围为280~380℃,在350℃左右萃取物生成速率有极大值,在该阶段同时还生成大量气体。随着压力的增加,木材转化和萃取物产率增加,气体产率减少。压力的影响主要体现在250℃以后。从工程的观点看,通过过程参数如温度和压力的调控,亚临界和超临界萃取工艺可适于木材资源的不同转化途径。

关键词: 木材转化, 超临界流体萃取, 亚临界流体萃取, 乙醇

Abstract: Dynamic conversion of wood by sub and supercritical ethanol extraction was studied in a semi continuous experimental apparatus using non isothermal extraction technique,and effects of pressure on extraction were mainly investigated.Results showed that the main extraction process of wood could be regarded as two stages roughly,temperature range of the first stage was from 200℃ to 280℃,and extract formation rate had maximum value at about 250℃.Temperature range of the second stage was from 280℃ to 380℃,and extract formation rate had the maximum value at about 350℃,while a great quantity of gas was generated in this stage simultaneously.Wood conversion and extract yield increased and gas yield decreased with increasing of pressure.Effect of pressure became significant after 250℃.From engineering standpoint,sub and supercritical extraction technology are applicable in different conversion ways of wood resources through controlling process variables such as temperature and pressure.

Key words: wood conversion, supercritical fluid extraction, subcritical fluid extraction, ethanol

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