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林产化学与工业 ›› 2000, Vol. 20 ›› Issue (3): 6-12.

• 研究报告 • 上一篇    下一篇

木材亚-超临界动态萃取过程解析

钱学仁, 李坚   

  1. 东北林业大学林产工业学院, 黑龙江 哈尔滨 150040
  • 收稿日期:1999-08-01 修回日期:1900-01-01 出版日期:2000-09-30 发布日期:2000-09-30

ANALYSIS OF SUB AND SUPERCRITICAL DYNAMIC EXTRACTION PROCESS OF WOOD

QIAN Xue-ren, LI Jian   

  1. Northeast Forestry University, Harbin 150040, China
  • Received:1999-08-01 Revised:1900-01-01 Online:2000-09-30 Published:2000-09-30

摘要: 在半连续萃取装置上,采用非等温实验技术,以乙醇或乙醇-水为溶剂,对兴安落叶松木材亚 超临界动态萃取过程进行了解析。在 320~360℃范围内,反应系统有明显的热效应产生,经木材组分的热分析证实,这是木材组分剧烈热分解的缘故。依据木材萃取速率、产物特性和萃取机制,构建了木材亚 超临界萃取过程模型。小于 120℃进行的是木材中低分子物质的物理溶解,120~200℃进行的是木材中高分子物质的化学降解,200~275℃进行的是木材中高分子物质的化学降解和热降解,275~370℃进行的是木材中高分子物质的热分解,大于 370℃进行的是木材组分的进一步炭化或煅烧及乙醇溶剂分子的热分解

关键词: 木材, 亚临界萃取, 超临界萃取

Abstract: The sub-and supercritical dynamic extraction process of larch wood with ethanol or ethanol-water in a semicontinuous extraction apparatus was analyzed by non-isothermal experimental technique.In the range from 320℃ to 360℃, thermal effect was created obviously in the reaction system.This was attributed to the thermal decomposition of wood constituents from thermal analysis of wood constituents.The sub-and supercritical extraction process model of wood was presented based on the extraction rate, product characteristics and extraction mechanism.Under 120℃, physical dissolution of the low molecular substances in wood occurred.From 120℃ to 200℃, chemical degradation of macromolecular substances in wood occurred.From 200℃ to 275℃, chemical degradation and thermal degradation of macromolecular substances in wood occurred.From 275℃ to 370℃, thermal decomposition of macromolecular substances in wood occurred.Over 370℃, further carbonization or calcination of wood and thermal decomposition of ethanol occurred.

Key words: wood, subcritical extraction, supercritical extraction

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