EXTRACTION EQUILIBRIUM CHARACTERISTICS OF DICARBOXYLIC ACIDS WITH TRIALKYLPHOSPHINE OXIDE AS EXTRACTANT AND 1-OCTANOL AS DILUENT

LI Yuxin; WANG Yundong; DAI Youyuan

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EXTRACTION EQUILIBRIUM CHARACTERISTICS OF DICARBOXYLIC ACIDS WITH TRIALKYLPHOSPHINE OXIDE AS EXTRACTANT AND 1-OCTANOL AS DILUENT

更新时间：2025-12-10

- EXTRACTION EQUILIBRIUM CHARACTERISTICS OF DICARBOXYLIC ACIDS WITH TRIALKYLPHOSPHINE OXIDE AS EXTRACTANT AND 1-OCTANOL AS DILUENT
- CIESC Journal Issue 3, Pages: 379-383(2004)
- 作者机构：
  
  清华大学化学工程联合国家重点实验室,北京,100084
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 March 2004，
  
  Published：25 March 2004
- 稿件说明：
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LI Yuxin, WANG Yundong, DAI Youyuan. EXTRACTION EQUILIBRIUM CHARACTERISTICS OF DICARBOXYLIC ACIDS WITH TRIALKYLPHOSPHINE OXIDE AS EXTRACTANT AND 1-OCTANOL AS DILUENT[J]. CIESC Journal, 2004, (3): 379-383.
DOI：

LI Yuxin, WANG Yundong, DAI Youyuan. EXTRACTION EQUILIBRIUM CHARACTERISTICS OF DICARBOXYLIC ACIDS WITH TRIALKYLPHOSPHINE OXIDE AS EXTRACTANT AND 1-OCTANOL AS DILUENT[J]. CIESC Journal, 2004, (3): 379-383. DOI：

摘要

以二元羧酸乙二酸、丙二酸、丁二酸、顺丁烯二酸和苹果酸为分离对象，三烷基氧膦（TRPO）为络合剂，正辛醇为稀释剂进行了系统的萃取相平衡实验.结果表明，溶质的pKa1和羧酸的亲油性同时影响络合萃取平衡.红外光谱分析表明，萃取剂TRPO与正辛醇之间形成氢键，抑制了对羧酸的萃取，使得TRPO与有机羧酸之间形成1∶1的络合物；负载有机羧酸的红外谱图表明，TRPO萃取有机羧酸为氢键溶剂化历程，负载有机羧酸的TRPO中的P=O键吸收峰的位移与有机羧酸的酸性有关.采用质量作用定律分析方法建立了负载量的表达式，模型拟合精度令人满意.

Abstract

Extraction of oxalic acid

propandioic acid

succinic acid

maleic acid and malic acid with trialkylphosphine oxide(TRPO) dissolved in 1-octanol was studied.The experimental results showed that the complexing extraction equilibrium constants were dependent on pKa1 and hydrophobicity of the organic acids. By Fourier transform infrared spectroscopic (FTIR) analysis

it was found that the extraction process was mainly governed by hydrogen bonding solvation. There is hydrogen bonding between TRPO and 1-octanol

which retards the extraction process.A 1∶1 complex between TRPO and organic acids was formed according to mass action law

and a general expression of experimentally accessible extraction loading on the molar concentration scale was developed. Extraction equilibrium constants were obtained by correlating experimental data with the least square method. The calculated loading and organic acid concentrations were in good agreement with the experimental ones.

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