SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 74 ›› Issue (10): 117-126.DOI: 10.1016/j.cjche.2024.06.009

• Full Length Article • 上一篇    下一篇

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

Zhuojun Jiang1, Yufeng Liang2, Shuyao Xiong3, Guo Li4, Qian Zhang1, Benzheng Xia1, Liangrong Yang1, Zheng Li1,5   

  1. 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-Unité de 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
  • 收稿日期:2024-04-26 修回日期:2024-06-21 接受日期:2024-06-25 出版日期:2024-10-28 发布日期:2024-07-16
  • 通讯作者: Zheng Li,E-mail:zli@ipe.ac.cn
  • 基金资助:
    The study was 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), and Shandong Energy Institute (SEI U202306).

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

Zhuojun Jiang1, Yufeng Liang2, Shuyao Xiong3, Guo Li4, Qian Zhang1, Benzheng Xia1, Liangrong Yang1, Zheng Li1,5   

  1. 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-Unité de 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
  • Received:2024-04-26 Revised:2024-06-21 Accepted:2024-06-25 Online:2024-10-28 Published:2024-07-16
  • Contact: Zheng Li,E-mail:zli@ipe.ac.cn
  • Supported by:
    The study was 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), and 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 (H3BO3) and separate boron isotopes. However, the structure of ligands might impact H3BO3 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 H3BO3 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 H3BO3. H3BO3 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

Abstract: A synergistic solvent extraction system comprising trioctylamine (TOA) and ligands with hydroxyl and carboxyl groups can efficiently recover boric acid (H3BO3) and separate boron isotopes. However, the structure of ligands might impact H3BO3 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 H3BO3 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 H3BO3. H3BO3 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.

Key words: Boric acid, 2-Hydroxydodecanoic acid, Synergistic extraction, Coordination mechanism, Boron isotope separation