Bis(2,4,4-trimethylpentyl)phosphinic Acid – The Preferred Extractant for High-Purity Metal Separation

July 22, 2026

Anhui Fitech Material Co., Ltd

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In the field of solvent extraction, Bis(2,4,4-trimethylpentyl)phosphinic acid has established itself as a highly effective and versatile extractant. Commonly known as a dialkylphosphinic acid, this organophosphorus compound is widely recognized for its excellent selectivity and extraction efficiency, particularly in the separation and purification of rare earth elements and non-ferrous metals.

Chemical Overview

Bis(2,4,4-trimethylpentyl)phosphinic acid has the molecular formula C₁₆H₃₅O₂P and CAS number 83411-71-6. It is a colorless to light yellow viscous liquid with a density of approximately 0.93–0.96 g/mL at 20°C and a flash point above 150°C. It is soluble in organic solvents such as kerosene, toluene, and xylene but only sparingly soluble in water. Its strong hydrophobic nature and high acid strength make it particularly suitable for acid extraction processes.

Key Applications

This extractant is primarily used in the following areas:

1. Rare Earth Element Separation – It exhibits outstanding selectivity for heavy rare earth elements such as yttrium, europium, terbium, and dysprosium, making it a key reagent in the production of high-purity rare earth oxides.

2. Nickel and Cobalt Recovery – Widely used in hydrometallurgical processes for the separation of nickel and cobalt from laterite ore and spent battery materials.

3. Lithium Extraction– Increasingly applied in lithium recovery from brine and leach liquors.

4. Purification of Other Metals – Also used in the extraction and separation of copper, zinc, and other valuable metals.

Why Choose Us?

We supply high-quality Bis(2,4,4-trimethylpentyl)phosphinic acid with consistent purity and batch-to-batch stability. Our products are backed by strict quality control and reliable packaging to ensure safe handling and transportation. With years of experience in the chemical industry, we are committed to providing our customers with competitive pricing, timely delivery, and responsive technical support.