Experimental and model study on enantioselective reactive extraction of p-hydroxyphenylglycine enantiomers with metal phosphine complexes

Experimental and model study on enantioselective reactive extraction of p-hydroxyphenylglycine enantiomers with metal phosphine complexes
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金属膦配合物对羟基苯甘氨酸对映体选择性反应萃取实验及模型研究

DOI:
10.1016/j.seppur.2013.05.001
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发表时间:
2013-08
影响因子:
8.6
通讯作者:
Jiajia Liu
Jiajia Liu
中科院分区:
工程技术1区
文献类型:
--
作者:
Guohui Wu;Panliang Zhang;Congshan Zhou;Jiajia Liu

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采用 (S)-BINAP-金属配合物作为主体(选择器)对羟基苯甘氨酸 (HPG) 对映异构体的对映选择性反应萃取的平衡研究是在 5°C 的间歇系统中进行的。建立了 HPG 对映体与 (S)-BINAP-金属配合物界面反应的反应萃取模型来描述实验数据。通过实验确定界面处的平衡形成常数和其他重要参数。该萃取系统对 HPG 对映体表现出良好的选择性。与钯的络合物(PdCl2-(S)-BINAP)在所研究的金属络合物中表现出最高的选择性,其溶解在有机相中并优先从水相中萃取l-HPG。萃取效率通常很大程度上取决于许多工艺变量,包括有机溶剂和金属前体的类型、配体浓度、pH 值和温度。该模型定量预测提取性能作为关键操作参数的函数,为过程优化提供了一种简单的计算方法。该模型经过实验验证,取得了良好的效果。
Equilibrium study on enantioselective reactive extraction of p-hydroxyphenylglycine (HPG) enantiomers employing (S)-BINAP–metal complexes as host (selector) was performed in a batch system at 5°C. A reactive extraction model with an interfacial reaction of HPG enantiomers with (S)-BINAP–metal complexes was established to describe the experimental data. The equilibrium formation constants at the interface and other important parameters were determined experimentally. The extraction system shows good selectivity towards HPG enantiomers. Complex with palladium (PdCl2-(S)-BINAP) exhibits the highest selectivity among the metal complexes studied, which is solubilized in the organic phase and preferentially extracts l-HPG from aqueous phase. Efficiency of extraction depends, often strongly, on a number of process variables, including types of organic solvents and metal precursors, concentration of ligand, pH, and temperature. The model quantitatively predicts extraction performance as a function of key operating parameters, providing a simple computational approach to process optimization. The model was verified experimentally with excellent results.
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