CAS No. 298-07-7 is named Di-(2-ethylhexyl)phosphoric acid, it is an organophosphorus compound that is part of a class of phosphoric acid derivatives. It is widely used in various industrial applications due to its properties as a solvent and extractant.
CAS No. 298-07-7, the Industrial Benchmark Acidic Organophosphorus Extractant for Metal Purification
CAS No. 298-07-7 (chemical names include Bis(2-ethylhexyl) phosphate, Di-(2-ethylhexyl) phosphoric acid, or more commonly P204 / D2EHPA) is an acidic organophosphorus liquid-liquid solvent extraction (SX) reagent. It stands as the backbone solvent in global non-ferrous hydrometallurgy, renowned for its highly tunable affinity for multivalent metal cations under controlled acidic pH isotherms.
Whether processing end-of-life lithium-ion battery black mass or refining critical rare earth elements (REEs), CAS 298-07-7 acts as a highly selective chelating matrix, providing industrial plants with predictable equilibrium kinetics and robust physical phase disengagement.
Technical Specifications & Chemical Properties of CAS No. 298-07-7:
P204
Di-(2-ethylhexyl)phosphoric acid (DEHPA or HDEHP)
CAS: 298-07-7
EINECS: 206-056-4
Chemical formula: C16H35O4P
Molar mass: 322.43 g/mol
Density: 0.972 g/ml
Melting point: -50°C
Boiling point: 393°C
Content: 95.64%
UN number: 1902
Transport Hazard class: 8
Packing group: III
Appearance: Typically, it appears as a clear, colorless to yellow liquid.
Solubility: Soluble in organic solvents, including hydrocarbons and alcohols, but insoluble in water.
Density: It has a lower density than water.
Key Physical Features of CAS No. 298-07-7:
Hydrophobic Integrity: Exceptionally low solubility in water (0.1 g/L), minimizing organic loss to the aqueous raffinate or advance lines.
Low Volatility: Negligible vapor pressure under conventional operating parameters (25–45°C), safeguarding ambient plant working air quality.
Diluent Versatility: Perfectly miscible with standard aliphatic and aromatic hydrocarbon carriers (e.g., 260# solvent oil, Escaid 110, sulfonated kerosene).
Global Supply, Packaging, and Quality Logistics
As the major manufacturer, we offer CAS No. 298-07-7 with guaranteed lot-to-lot consistency. Material is packed securely in heavy-duty 200kg plastic drums or 1000kg intermediate bulk container (IBC).
Contact us today to request a current price quote, a formal Certificate of Analysis (CoA), or specialized blending instructions alongside complementary phosphinic acid reagents (like P507 / CAS 83411-71-6).
Meantime, our metal extractants as below, if you need, please feel free to ask us:
- P204 (D2EHPA or HDEHP) This is used for first step to remove impurity for laterite nickel ore.
- P507 non-ferrous metal extractant for copper, zinc, cobalt-nickel, cadmium, gold-silver, platinum group metals, rare earths and so on.
- DY272 Nickel cobalt separation extractant, it can take cobalt out from nickel cobalt solution, then leave pure nickel.
- DY984N copper solvent extraction reagent.
- QL256-2 Nickel Cobalt Manganese co extraction Extractant.
- DY316 Lithium extractant.
- DY319 high efficiency nickel cobalt co-extraction extractant for battery recycling, can take out nickel and cobalt together from Lithium battery electrolyte.
- DY366 Scandium extractant.
- DY377 efficient nickel and diamond separation extractant.
