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Kelex-100 Chelating Extractant (CAS 73545-11-from China Suppliers & Factory for Metal Solvent Extraction
Basic Information
| Molecular Formula | C20H29NO |
| CAS | 73545-11-6 |
| Molecular Weight | 299.46 |
| Appearance | Dark reddish‑brown viscous liquid |
| Purity | ≥97% generally |
| Boiling Point | Approx. 430°C (760mmHg) |
| Flash Point | Approx. 214°C |
| Storage | Refrigerate at 2‑8°C, store in sealed and dark conditions |
Core Properties
Dual-functional-group chelation
Contains quinoline ring tertiary nitrogen (protonated in acidic medium to bind anions) and 8‑hydroxyl group (dissociated in neutral/alkaline medium to bind metal cations), suitable for extraction in a wide pH range.
High selectivity
Strong chelating capacity for gallium, copper, zinc, cadmium, germanium, cobalt and other metal ions; extremely low selectivity for monovalent ions (ratio around 5000:1).
Excellent oil solubility
Freely soluble in organic solvents such as kerosene and xylene, barely soluble in water, ideal for liquid‑liquid extraction systems.
Main Applications (Mainly for Hydrometallurgy)
- Gallium (Ga) recovery: Selective extraction of gallium from alkaline Bayer‑process mother liquor of bauxite, one of the mainstream industrial processes.
- Separation of copper/zinc/cadmium: Efficient extraction of copper, zinc and cadmium in acidic medium for ore leachate and wastewater treatment.
- Germanium (Ge) extraction: Separation and enrichment of germanium from acidic solutions of coal‑fired ash, zinc smelting slag, etc.
- Precious metal & rare‑earth separation: Used for separation and purification of cobalt, nickel and rare‑earth elements (e.g. neodymium), often compounded with Cyanex272.
Working Mechanism
It extracts metals via dual mechanisms: cation exchange (neutral/weakly acidic environment) and anion exchange (strongly acidic environment). The metal‑loaded organic phase can be stripped with dilute acid (e.g. 1–2M H₂SO₄) to realize metal recovery and extractant regeneration.
Safety & Precautions
Handling and Storage Hazards
- Irritation: Irritating to skin, eyes and respiratory tract; operate with goggles, chemical‑resistant gloves and fume hood.
- Environmental hazard: Avoid direct discharge; dispose as hazardous waste.
- Incompatibility: May decompose and lose efficacy under high temperature with strong oxidants, strong acids and strong alkalis.
Distinction Reminder
Kelex‑100 (liquid extractant) ≠ Chelex 100 (solid chelating resin, Bio‑Rad brand for molecular biology). They differ greatly in form and application.
Frequently Asked Questions
Q: What is the CAS number and molecular weight of Kelex-100?
The CAS number is 73545-11-6 and its molecular weight is 299.46.
Q: What is the primary industrial application of this product?
It is primarily used in hydrometallurgy, particularly for gallium (Ga) recovery from the alkaline Bayer-process mother liquor of bauxite, as well as separating copper, zinc, cadmium, and germanium.
Q: How does the working mechanism of Kelex-100 function?
It extracts metals through dual mechanisms: cation exchange in neutral or weakly acidic environments, and anion exchange in strongly acidic environments. The metal-loaded organic phase can then be stripped with a dilute acid like H₂SO₄.
Q: What are the proper storage conditions for this liquid extractant?
It should be refrigerated at temperatures between 2 to 8°C, and stored in tightly sealed, dark conditions to prevent decomposition.
Q: Is Kelex-100 the same as Chelex 100?
No, they are completely different. Kelex-100 is a liquid extractant used for solvent extraction in hydrometallurgy, while Chelex 100 is a solid chelating resin used in molecular biology.