KINETICS OF CHELATING EXTRACTION OF HEAVY METALS BY SUPERCRITICAL CO<sub>2</sub>

CUI Hongyou; WANG Tao; GUAN Yanfen; SHEN Zhongyao

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KINETICS OF CHELATING EXTRACTION OF HEAVY METALS BY SUPERCRITICAL CO₂

更新时间：2025-12-10

- KINETICS OF CHELATING EXTRACTION OF HEAVY METALS BY SUPERCRITICAL CO₂
- CIESC Journal Issue 9, (2001)
- 作者机构：
  
  清华大学化学工程系
- 作者简介：
- 基金信息：
- DOI：
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- Online First：25 September 2001，
  
  Published：25 September 2001
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CUI Hongyou, WANG Tao, GUAN Yanfen, et al. KINETICS OF CHELATING EXTRACTION OF HEAVY METALS BY SUPERCRITICAL CO₂[J]. CIESC Journal, 2001, (9).
DOI：

CUI Hongyou, WANG Tao, GUAN Yanfen, et al. KINETICS OF CHELATING EXTRACTION OF HEAVY METALS BY SUPERCRITICAL CO₂[J]. CIESC Journal, 2001, (9). DOI：

摘要

Abstract

The kinetics of supercritical chelating extraction of heavy metal from a Chinese traditional medicine material was investigated.The extraction efficiencies of the heavy metals increased rapidly within the first 15min extraction at 40℃ and 20.0MPa by CO 2 modified with 5% ethanol solution containing 1% diethylammonium diethyldithiocarbamate as chelating reagent.Then

the extraction efficiencies increased slowly with time while that of Pb leveled off.The results indicated that the contents of trace heavy metals in the sample had major effects on the extraction rates when the chelating reagent was excessive.The chelating reaction is the rate-controlling step.The extraction of trace heavy metals from the Chinese traditional medicine material is controlled by a pseudo-first-order chelating reaction.

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KINETICS OF CHELATING EXTRACTION OF HEAVY METALS BY SUPERCRITICAL CO2

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KINETICS OF CHELATING EXTRACTION OF HEAVY METALS BY SUPERCRITICAL CO₂