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Di (2-ethylhexyl) Phosphate (P204)

Di(2-ethylhexyl) phosphate (P204), also known as bis(2-ethylhexyl) phosphate, is an organophosphorus compound with the chemical formula C16H35O4P. It is a colorless to pale yellow liquid that is widely used in various industrial applications. 

CAS No.: 298-07-7 

Molecular formula: (C8H17O)2PO2H

Molecular weight: 322.42 (according to the Standard Atomic Weights 1987)

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Structure Diagram of Di (2-ethylhexyl) Phosphate (P204)



Molecular formula


Molecular weight

322.42 (according to the Standard Atomic Weights 1987)

Molecular structure diagram

Di (2-ethylhexyl) Phosphate (P204) of Molecular Structure Diagram

Properties: Colorless or light yellow oily liquid; soluble in alcohol and other organic solvents. Freezing point: -60℃; boiling point: 209℃ (10 mmHg).

Introduction of Di (2-ethylhexyl) Phosphate (P204)


Application: This product is an acidic phosphorus extractant, mainly used for extraction and separation of rare metals and rare earths, and can also be used in medicine, printing and dyeing, petrochemical wastewater treatment and other industries.


Packaging: 200 kg/plastic barrel; 1000 L/IBC ton 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 Di (2-ethylhexyl) Phosphate (P204)


Export Grade

Superior Grade

Industrial Grade

Content %




Monooctyl Phosphate %




Chroma (Pt-Co Color Number)




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 Di(2-Ethylhexyl) Phosphate (P204) Function?


Complex Formation: P204 acts as a complexing agent, forming coordination compounds with metal ions present in an aqueous solution. When P204 is dissolved in an organic solvent, it creates an interface between the aqueous and organic phases.


Selective Extraction: P204 selectively extracts specific metal ions from the aqueous solution into the organic phase. The metal ions form complexes with P204, which have higher solubility in the organic solvent compared to the aqueous phase.


Phase Separation: After the extraction, the organic phase containing the metal-P204 complexes is separated from the aqueous phase. This separation is facilitated by differences in density or the use of specific techniques such as centrifugation or settling.


Phase Separation: The metal-P204 complexes in the organic phase can be further processed to recover the desired metal. Stripping agents or solutions are used to break the complexes, releasing the metal ions into a new aqueous solution or suitable medium.


Purification and Recycling: The metal ions can undergo subsequent purification steps to obtain a high-purity metal product. Meanwhile, the organic phase, containing P204, can be recycled by removing impurities and reusing it in the extraction process.

Precautions for Di(2-ethylhexyl) Phosphate (P204)

Is P204 Toxic or Hazardous?

Di(2-ethylhexyl) Phosphate (P204) is considered a moderately toxic substance. It can cause irritation to the skin, eyes, and respiratory system upon direct contact or inhalation. It is essential to handle P204 with appropriate safety precautions, including the use of protective equipment and adherence to recommended handling procedures.

Are There Any Environmental Concerns Associated with P204?

Di(2-ethylhexyl) Phosphate (P204) has low aquatic toxicity and is not persistent in the environment. However, like other organophosphates, it should be handled and disposed of responsibly to prevent contamination of water bodies and ecosystems.