EXTRACTION MECHANISM OF OXALIC ACID BY TOA

QIN Wei; CAO Yanqing; LUO Xuehui; LIU Guojun; XU Lilian; DAI Youyuan

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EXTRACTION MECHANISM OF OXALIC ACID BY TOA

更新时间：2025-12-10

- EXTRACTION MECHANISM OF OXALIC ACID BY TOA
- CIESC Journal Issue 5, (2001)
- 作者机构：
  
  清华大学化学工程系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 May 2001，
  
  Published：25 May 2001
- 稿件说明：
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QIN Wei, CAO Yanqing, LUO Xuehui, et al. EXTRACTION MECHANISM OF OXALIC ACID BY TOA[J]. CIESC Journal, 2001, (5).
DOI：

QIN Wei, CAO Yanqing, LUO Xuehui, et al. EXTRACTION MECHANISM OF OXALIC ACID BY TOA[J]. CIESC Journal, 2001, (5). DOI：

摘要

选择草酸稀溶液为萃取对象

采用三辛胺 (TOA)为络合剂

正辛醇为稀释剂

开展了TOA萃取草酸的机理研究 .以红外谱图为分析手段

通过测定络合剂及被萃溶质的浓度对萃合物组成的影响

得到其萃合物以 1∶1和 1∶2 (酸 :碱 )两种形式存在于有机相中 ;并通过萃取平衡实验

获得了TOA萃取草酸的平衡特性

进一步验证了萃合物组成 .以此为基础建立了草酸与TOA两种萃合比情况下的数学模型

拟合求得了K11及K12

其中 1∶2萃合物的化学萃取平衡常数远远小于 1∶1的相应值

Abstract

In this paper

water-oxalic acid-TOA(octanol) is used as the experimental system

and TOA

octanal as complexing agent

diluent respectively.The extraction mechanism of oxalic acid by TOA and the influence of the concentration of TOA ( S0) and solute on extraction equilibrium are studied.The structure of complex in organic phase is measured by infrared spectroscopy

and it is obtained that there are two types of complexates in organic phase

1∶1 and 1∶2 (acid∶TOA).The distribution coefficient increases with S0.Loading of complexing agent shows an increasing tendency with S0 and the equilibrium concentration of acid in aqueous phase( x ).The saturated loading is achieved at higher x and increases with S0.The methematical model with two type complexes is proposed based.The model parameters

K11 and K12 are obtained by fitting the experimental data of extraction equilibrium

and K11 is much larger than K12 .

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