Di(2-ethylhexyl) phosphate extractant instruction
Di(2-ethylhexyl) phosphate extractant also be named P204 extractant, abbreviated as D2EHPA, it is an important organic phosphorus acid extractant, widely used in many industrial fields.
Its core characteristics and applications are as follows:
I. Basic characteristics of Di(2-ethylhexyl) phosphate extractant.
Physical properties
Appearance: colorless or slightly yellow transparent oily liquid, freezing point -60℃, relative density about 0.973 (25℃), viscosity about 42cPs (20℃).
Solubility: insoluble in water, easily soluble in organic solvents such as kerosene, sulfonated kerosene, ethanol and benzene.
Stability: exists in the form of hydrogen bond dimers in kerosene, which can mask polar phosphate groups and enhance the complexing ability with metal ions.
Chemical properties of Di(2-ethylhexyl) phosphate extractant:
Molecular formula: C₁₆H₃₅O₄P, molecular weight 322.4, flash point ≥160℃ (industrial grade).
Extraction mechanism: metal separation is achieved by exchanging H⁺ with metal cations, and it often participates in the reaction in the form of dimers.
II. Main application areas of Di(2-ethylhexyl) phosphate extractant:
Hydrometallurgy
Cobalt/nickel/manganese solution impurity removal: selective extraction of zinc, calcium, copper and other impurities (pH 3-4), for example, 25% P204 + sulfonated kerosene system can reduce the impurity content from 1000ppm to below 10ppm.
Copper electrolyte purification: efficient removal of iron and arsenic impurities (such as iron content from 1.5g/L to 0.05g/L), increasing copper recovery rate to 99.5%.
Rare earth separation
Purification of lanthanide elements: using the difference in separation coefficients for lanthanum, cerium, praseodymium and neodymium (pH 2.5-3.5), a single rare earth purity of 99.99% is achieved.
Uranium-thorium separation: preferential extraction of uranium in nuclear fuel processing (distribution ratio>50 at pH=1.5).
Wastewater treatment
Electroplating wastewater: removal rate of copper and nickel heavy metals>99.8%, copper concentration after treatment<0.1mg/L.
Mine wastewater: Recover resources such as iron and manganese, such as reducing the iron ion concentration from 5000mg/L to 5mg/L.
III. Key points of industrial operation
Saponification treatment: NaOH, NH₃·H₂O or Na₂CO₃ are required for saponification to form a microemulsion to improve the extraction efficiency.
Stripping conditions: Iron ions can be stripped with hydrofluoric acid, and fluoride-containing wastewater needs to be recycled; zinc and copper separation can be optimized by mixing ionic liquids.
Safety regulations:
Wear protective clothing, gloves and glasses during operation to avoid contact with skin;
Store in a cool and ventilated place, away from fire sources, and indicate “flammable and toxic” warnings.
IV. Quality standards
Requirements for industrial-grade products: content ≥90%, phosphate-octyl ester ≤2.7%, color (Pt-Co) ≤200, phase separation speed ≤180 seconds.
Our metal extractants as below, if you need any kind, please ask us:
- P204 (D2EHPA or HDEHP) This is used for first step to remove impurity for laterite nickel ore.
- DY319 high efficiency nickel cobalt co-extraction extractant for battery recycle, can take out nickel and cobalt together from Lithium battery electrolyte.
- DY272 Nickel cobalt separation extractant, it can take cobalt out from nickel cobalt solution, then leave pure nickel.
- DY988N/DY973N/DY902/DY5640 copper solvent extraction reagent.
- P507 non-ferrous metal extractant for copper, zinc, cobalt-nickel, cadmium, gold-silver, platinum group metals, rare earths and so on.
- DY377 efficient nickel and diamond separation extractant.
- DY366 Scandium extractant.
- DY316 Lithium extractant.
