TDPA Eutectic Extractant

Li recovery >97%

Lowers melting point below room temperature via TOPO, enabling effective stripping while maintaining high selectivity.

Zhang, Hepeng · Zhong, Tian · Gao, Yun · Li, Yu · Zhang, Haixia · Sun, Xiaoqi

Desalination 2026

Specifications

Li precipitation efficiency

{'zh': '97.5', 'en': '97.5'} %

Na precipitation

{'zh': '0.3', 'en': '0.3'} %

Li stripping efficiency

{'zh': '98', 'en': '98'} %

Li₂CO₃ purity

{'zh': '99.80', 'en': '99.80'} %

Advantages

Melting point below room temperature

Hydrogen bonding between P–OH of TDPA and P=O of TOPO disrupts the ordered TDPA network, reducing the melting point to below room temperature.

Effective stripping

The liquid-state eutectic enables Li stripping; with 2.15 mol/L H₂SO₄ for 3 h, stripping efficiency exceeds 98%.

Excellent Li/Na separation

Li precipitation efficiency >97.5% from LPML while Na precipitation <0.3%, giving an extremely high separation factor.

Applications

• Lithium recovery：Increase Li recovery from mother liquor and lower process cost
• Battery-grade Li₂CO₃：Directly produce battery-grade purity Li₂CO₃
• Na/Li separation：Efficiently separate Li from high-sodium solution with minimal Na co-precipitation
• Brine lithium extraction：Suitable for Li extraction from high-salinity brines and complex systems