正辛醇为稀释剂条件下二元羧酸的萃取平衡特性

化工学报 ›› 2004, Vol. 55 ›› Issue (3): 379-383.

正辛醇为稀释剂条件下二元羧酸的萃取平衡特性

李玉鑫;王运东;戴猷元

清华大学化学工程联合国家重点实验室，北京 100084

出版日期:2004-03-25 发布日期:2004-03-25

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

LI Yuxin;WANG Yundong;DAI Youyuan

Online:2004-03-25 Published:2004-03-25

摘要/Abstract

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pK_a1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.

关键词:

络合萃取, 三烷基氧膦（TRPO), 正辛醇, 有机羧酸

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 pK_a1 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.

Key words:

络合萃取, 三烷基氧膦（TRPO), 正辛醇, 有机羧酸

李玉鑫, 王运东, 戴猷元. 正辛醇为稀释剂条件下二元羧酸的萃取平衡特性 [J]. 化工学报, 2004, 55(3): 379-383.

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, 55(3): 379-383.

[1]	陈颍颍, 沈剑, 何潮洪. 三辛胺络合萃取分离一氯乙酸和二氯乙酸[J]. 化工学报, 2013, 64(2): 609-615.
[2]	张海燕，庞敏，吴韦，罗海军，宁英男，毛国梁. 正辛醇为载体的乳化液膜法脱酚 [J]. CIESC Journal, 2010, 29(12): 2400-.
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