Synergistic solvent extraction of boric acid by trioctylamine and 2-hydroxydodecanoic acid  

作　　者：Zhuojun Jiang Yufeng Liang Shuyao Xiong Guo Li Qian Zhang Benzheng Xia Liangrong Yang Zheng Li 

机构地区：[1]CAS Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [2]School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China [3]Univ.Lille,CNRS,Centrale Lille Institut,Univ.Artois,UMR 8181-UCCS-Unitéde Catalyse et Chimie du Solide,Lille F-59000,France [4]MCC Ruimu New Energy Technology Co.,Ltd,Tangshan 063200,China [5]School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100408,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第10期117-126,共10页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(22278407,21922814,22138012,22178349);CAS Project for Young Scientists in Basic Research(YSBR-038);National Key Research and Development Program of China(2021YFC2901500,2022YFC2105302);Shandong Energy Institute(SEI U202306).

摘　　要：A synergistic solvent extraction system comprising trioctylamine(TOA)and ligands with hydroxyl and carboxyl groups can efficiently recover boric acid(H_(3)BO_(3))and separate boron isotopes.However,the structure of ligands might impact H_(3)BO_(3) extraction,boron isotope separation,and solvent loss,which has not been thoroughly investigated.This study initially evaluated the influence of ligand's type,pKa,and substituents on H_(3)BO_(3) extraction efficiency,as well as the impact of the B_((4))-O structure(boron is bound to four oxygen atoms)in the organic phase on isotope separation efficiency.Subsequently,by synthesizing the highly hydrophobic 2-hydroxydodecanoic acid(HYA),the extraction performance and mechanism of the TOA/HYA system were investigated.The findings highlight the superior extraction efficiency when employing di-phenolic hydroxyl,phenolic hydroxyl + carbinol hydroxyl,and alcoholic hydroxyl + carboxyl ligands compared to phenolic hydroxyl + carboxyl,phenolic hydroxyl + ethanol hydroxyl,diol hydroxyl,and dicarboxylic ligands.The organic phase anion complex,exclusively comprising the B_((4))-O structure,enhances isotope separation effectiveness.The TOA/HYA system achieves an 80%single-stage extraction efficiency for H_(3)BO_(3).H_(3)BO_(3) and HYA are extracted into the organic phase at a ratio of 1:2,with the anion complex solely containing the B_((4))-O structure.This study paves the way for the construction of novel boric acid extraction and boron isotope separation systems.

关 键 词：Boric acid 2-Hydroxydodecanoic acid Synergistic extraction Coordination mechanism Boron isotope separation 

分 类 号：TQ128.54[化学工程—无机化工]