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Kelex-100 (EMBQ) Suppliers in China | Factory for Alkylated 8-Hydroxyquinoline Chelating Extractants
Basic Information
Core Features
- Dual functional group chelation: Containing a quinoline ring tertiary nitrogen (protonated in acidic media, binding an anion) and an 8-hydroxy group (dissoicated in neutral/alkaline media, binding a metal cation), enabling extraction across a wide pH range.
- High selectivity: Demonstrates strong chelating capacity for metal ions such as gallium, copper, zinc, cadmium, germanium, and cobalt, while exhibiting extremely low selectivity for monovalent ions (approximately 5000:1).
- Excellent oil solubility: Easily soluble in organic solvents such as kerosene and xylene, with extremely low water solubility, making it suitable for liquid-liquid extraction systems.
Main Applications (primarily hydrometallurgy)
- 1 Gallium (Ga) recovery: Selective extraction of gallium from the alkaline mother liquor of the Bayer process bauxite smelting, one of the mainstream industrial processes.
- 2 Copper/Zinc/Cadmium Separation: High-efficiency extraction of copper, zinc, and cadmium in acidic media, applicable for ore leaching solutions and wastewater treatment.
- 3 Germanium (Ge) extraction: Separation and enrichment of germanium from acidic solutions such as coal ash and zinc smelting slag.
- 4 Precious metal/rare earth separation: Used for the separation and purification of cobalt, nickel, and rare earth elements (e.g., neodymium), often combined with formulations such as Cyanex 272.
Mechanism of Action
Safety and Precautions
- Irritancy: Irritates the skin, eyes, and respiratory tract; protective eyewear, chemical-resistant gloves, and a fume hood are required during handling.
- Environmental risks: Avoid direct discharge; handle as hazardous waste.
- Incompatibility: May decompose and lose efficacy when exposed to strong oxidizers, strong acids, or strong bases at high temperatures.
Kelex-100 (an extractant, liquid) = Chelex 100 (a chelating resin, solid, branded by Bio-Rad, used in molecular biology); the two products have entirely different applications and formulations.
Frequently Asked Questions (FAQ)
Kelex-100 has the molecular formula C₂₀H₂₉NO and a molecular weight of 299.46. It is a dark reddish-brown viscous liquid with a boiling point of approximately 430°C and a flash point of around 214°C.
It features dual functional group chelation, combining a quinoline ring tertiary nitrogen and an 8-hydroxy group. This allows it to selectively bind metal ions (such as gallium, copper, zinc, cadmium, germanium, and cobalt) across a wide pH range, with very low selectivity for monovalent ions (5000:1).
Kelex-100 is primarily used in hydrometallurgy. Key applications include gallium recovery from the Bayer process bauxite smelting, separation of copper, zinc, and cadmium, germanium extraction from coal ash or slag, and the separation of precious metals or rare earth elements.
The metal-loaded organic phase undergoes back-extraction (stripping) using a dilute acid, such as 1–2 M H₂SO₄. This process recovers the target metals and regenerates the Kelex-100 extractant for reuse.
No. Kelex-100 is a liquid chemical extractant used in hydrometallurgical extraction. Chelex 100 is a solid chelating resin branded by Bio-Rad, mainly used in molecular biology and analytical chemistry. They have completely different formulations and applications.
Kelex-100 should be stored tightly sealed, protected from light, and refrigerated at 2–8°C. During handling, use protective eyewear, chemical-resistant gloves, and a fume hood to prevent skin, eye, and respiratory irritation. Avoid contact with strong oxidizers, acids, or bases at high temperatures.