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2-ethylhexyl Hydrogen-2-ethylhexyl Phosphonate (P507)

2-ethylhexyl Hydrogen-2-ethylhexyl Phosphonate, commonly referred to as P507, is an organophosphorus compound used as an extractant in various hydrometallurgical processes. It shares similarities with other organophosphonate extractants, such as Di(2-ethylhexyl) phosphoric acid (D2EHPA) or Cyanex 272.

CAS No.: 14802-03-0 

Molecular formula: (C8H17)2PO3H

Molecular weight: 306.4 (according to the Standard Atomic Weights 1987)

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Structure Diagram of 2-ethylhexyl Hydrogen-2-ethylhexyl Phosphonate (P507)



Molecular formula


Molecular weight

306.4 (according to the Standard Atomic Weights 1987)

Molecular structure diagram

2-ethylhexyl Hydrogen-2-ethylhexyl Phosphonate (P507) of Molecular Structure Diagram

Properties: This product is a yellowish transparent oily liquid, soluble in alcohol, benzene, ketone and other organic solvents, insoluble in water.

Introduction of 2-ethylhexyl Hydrogen-2-ethylhexyl Phosphonate (P507)


Application: This product is an acidic phosphorus extractant, extensively used in the extraction and separation of non-ferrous metals and rare earths.


Packaging: 200 kg/plastic barrel; 1000 L/IBC barrel.


Storage and transportation: Handled with care during transportation to prevent impact. Stored in a cool, ventilated and dry warehouse, ensuring fire prevention and rain proof.

Specifications of 2-ethylhexyl Hydrogen-2-ethylhexyl Phosphonate (P507)


Special Grade

Superior Grade

Industrial Grade





Dibasic Acid %




Phase Separation Time (s)




Acid value mgKOH/g



Density (20℃) g/mL



Viscosity (cp) 25℃ mm2/s



Flash Point (open cup method) ℃



Refractive Index(Nd20)



Monometallic Impurity (ppm)

This item can be controlled below 60 according to client demand


How Does -ethylhexyl Hydrogen-2-ethylhexyl Phosphonate (P507) Function?


Purification and Recycling: The recovered metal ions can undergo further purification steps to obtain a high-purity metal product. Meanwhile, the organic phase containing P507 can be recycled by removing impurities and reusing it in the extraction process.


Selective Extraction: P507 selectively extracts specific metal ions from the aqueous solution into an organic solvent phase. When P507 is dissolved in an appropriate organic solvent, it creates an interface between the aqueous and organic phases, facilitating the transfer of metal ions.


Complex Formation: P507 acts as a chelating agent, forming coordination complexes with metal ions present in an aqueous solution. It possesses a phosphonate functional group that can bind to metal ions, particularly those of interest in hydrometallurgy, such as rare earth elements, uranium, and thorium.


Partitioning: In a liquid-liquid extraction process, the metal ions form complexes with P507 in the organic phase, which has higher solubility for these complexes compared to the aqueous phase. This preferential partitioning allows for the separation of target metal ions from the aqueous solution.


Phase Separation: After the extraction, the organic phase containing the metal-P507 complexes is separated from the aqueous phase. This separation can be achieved through settling, centrifugation, or other techniques that exploit the differences in density or immiscibility of the two phases.


Stripping or Recovery: The metal-P507 complexes in the organic phase can undergo a stripping process to release the metal ions into a new aqueous solution or suitable medium. Stripping agents or solutions with appropriate pH and chemical properties are used to break the complexes, enabling the recovery of the desired metal.

Precautions for 2-ethylhexyl Hydrogen-2-ethylhexyl Phosphonate (P507)

Are There Any Safety Considerations When Working with P507?

 Like other chemical compounds, it is important to handle P507 with proper safety precautions. It is advisable to follow recommended guidelines for storage, handling, and disposal. P507 may have specific health and safety hazards associated with its handling, so it is essential to consult safety data sheets and take appropriate measures.

Can P507 Be Reused or Recycled?

Yes, P507 can be recycled and reused in the extraction process. After metal recovery, the organic phase containing P507 can undergo purification steps to remove impurities and contaminants, making it suitable for subsequent extractions.