CIESC Journal ›› 2021, Vol. 72 ›› Issue (6): 3014-3021.DOI: 10.11949/0438-1157.20201711

• Special column for comprehensive utilization of salt lake resouces in Qinghai • Previous Articles     Next Articles

Synthesis and properties of solvent polar responsive butyl-cyclic tetrapyridine molecule for lithium extraction

LI Enze1(),YE Peiyuan1,WANG Yaxin1,KANG Jin1,YIN Caixia2,CHENG Fangqin1()   

  1. 1.Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, Shanxi, China
    2.Institute of Molecular Science, Shanxi University, Taiyuan 030006, Shanxi, China
  • Received:2020-11-30 Revised:2021-03-05 Online:2021-06-05 Published:2021-06-05
  • Contact: CHENG Fangqin

溶剂极性响应型丁基-环四联吡啶提锂分子的合成及性能研究

李恩泽1(),叶培远1,王亚欣1,康锦1,阴彩霞2,程芳琴1()   

  1. 1.山西大学资源与环境工程研究所,山西 太原 030006
    2.山西大学分子科学研究所,山西 太原 030006
  • 通讯作者: 程芳琴
  • 作者简介:李恩泽(1988—),男,博士,副教授,lienze@ sxu.edu.cn
  • 基金资助:
    国家自然科学基金项目(21908137);山西省回国留学人员科研资助项目(HGKY2019005);青海省重点研发与转化计划项目(2020-GX-101)

Abstract:

The extraction of lithium from salt lake brine has gradually become one of the crucial ways for the production of lithium and lithium related products in China. However, the high magnesium-to-lithium ratio of salt lake brines in China makes it difficult to extract lithium ions. Traditional solvent extraction processing of lithium from salt lake brine always requires a lot of co-extract and high concentration of acid, resulting in low product purity and high risk. A kind of butyl-cyclic tetrapyridine molecules for lithium extraction with solvent polar responsive molecular structure “isomerism” was designed and synthesized to realize “lithium-complexing” under polar conditions and “lithium-releasing” under non-polar conditions. The 1H NMR and high resolution mass spectrometry were used to characterize the molecular structure of the target molecule. By comparing the spectral properties of the target molecule in the presence of Li+ and Mg2+, it is shown that the butyl-cyclotetrapyridine molecule has a strong selectivity to lithium ions. In addition, the results of ion transport across the supporting liquid membrane further indicate that butyl-cyclotetrapyridine molecules can achieve high selective extraction of lithium ions under different polar solvent conditions.

Key words: solvent polarity, cyclic tetrapyridine, molecule for lithium extraction, synthesis, transport, membrane

摘要:

盐湖卤水提锂已逐渐成为我国锂及锂产品的生产途径之一,而我国盐湖卤水高镁锂比的特点导致锂离子提取难度大。传统溶剂萃取提锂过程中需使用大量协萃剂和高浓度酸,产品纯度低、危险度高。设计合成了一种具有溶剂极性响应性分子结构“异构互变”的丁基-环四联吡啶提锂分子,实现极性条件下“络合”锂,非极性条件下“释放”锂。核磁共振氢谱和高分辨质谱证实了目标分子结构的准确性,通过对比Li+和Mg2+存在时目标分子的光谱性质表明丁基-环四联吡啶分子对锂离子具有较强的选择性。此外,支撑液膜的离子跨膜传输结果进一步表明,丁基-环四联吡啶分子在不同极性溶剂条件下可以实现对锂离子的高选择性提取。

关键词: 溶剂极性, 环四联吡啶, 提锂分子, 合成, 传递,

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