Synthesis of DCAP and its effects on extraction separation of light rare earth ions

ABSTRACT

A de-tert-butyl calix arene phosphate (DCAP) with a complete elimination of the upper edge and a complete substitution of the lower edge was synthesized by dealkylation and substitution reactions. The chemical structure of DCAP was further characterized by FTIR, mass MS and ¹ H NMR. The ability of DCAP to extract light rare earth ions was studied as a function of concentration, aqueous phase pH, phase ratio, and extraction time. The results showed that DCAP had a 4% higher extraction rate of Pr³⁺ compared to Nd³⁺ under the same conditions. Preliminary extraction mechanism was also investigated.

KEYWORDS:

• DCAP
• synthesis
• rare earth separation
• extraction equilibrium constant
• extraction mechanism

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (No.21471053), the Natural Science Foundation of Hunan Province (2018JJ3211) and Scientific Research Fund of Hunan Provincial Education Department (19C0868);National Natural Science Foundation of China [21471053];Scientific Research Fund of Hunan Provincial Education Department [19C0868];Natural Science Foundation of Hunan Province [2018JJ3211];