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Bis-(2,4,4-Trimethylpentyl) Phosphinic SI 272 is a high-efficiency organophosphorus extractant used in the hydrometallurgical separation of cobalt, nickel, magnesium, and rare earth metals. Its exceptional chemical stability, low water solubility, and excellent phase separation properties make it ideal for solvent extraction circuits in mining and refining applications.
Product Name: Bis-(2,4,4-Trimethylpentyl) Phosphinic
Molecular Formula: C₁₆H₃₅O₂P
CAS No.: 83411-71-6
Molecular Weight: 290.42
Physical Parameters
| Specifications | Standard |
| Density, 25°C | ≤ 0.92 g/cm³ |
| Viscosity, 25°C | < 142 mpa·s |
| Flash Point | > 120°C |
| Pour Point | < -35°C |
| Content | ≤ 95.0% |
Characteristic Parameter
| Parameter | Standard |
|---|---|
| Extraction Cobalt saturation Capacity | 0.432g/L,1v/o |
| Extraction rate,pHñ5.6,25˚C | Nickel<5.85% |
| Cobalt>99.8% | |
| Stripping rate,25˚C | Nickel>98.1% |
| Cobalt>99.5% | |
| Separation factor,pH=5.6 | >7×103 |
| Ni-MgSeparationfactor,pH=5.6 | >3×103 |
| Split time | Extraction<60 |
| Backextraction<60 | |
| Dissolution loss in water(pH=2.6) | ≤116mg/L |
| Applicable temperature range(˚C) | Oct-70 |
| Maximum applicable concentration | ≤30% |
| Maximum saponification rate | Not low than 55% |
| Applicable metal element system | Enrichment and separation of nickel-cobalt,nickel-magnesium,cobalt-magnesium, and rare earth elements, especially suitable for separation of nickel-magnesium, nickel- cobalt |
Application
SI 272 is primarily used for the enrichment and separation of nickel, cobalt, magnesium, and rare earth elements, offering high selectivity and operational stability. It is particularly suitable for nickel-cobalt and nickel-magnesium separation systems, enabling efficient recovery in hydrometallurgical extraction processes.