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Kelex-100 (EMBQ) - Top China Suppliers and Factory for Alkylated 8-Hydroxyquinoline Chelating Extractant
Basic Information
- Molecular formula C₂₀H₂₉NO
- Molecular weight 299.46
- Appearance A dark reddish-brown viscous liquid
- Purity Typically ≥97%
- Boiling point Approximately 430°C (760 mmHg)
- Flash point approximately 214°C
- Storage Store refrigerated at 2–8°C, tightly sealed and protected from light
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)
Mechanism of Action
Metals are extracted through dual mechanisms: cation exchange (neutral/weakly acidic) and anion exchange (strongly acidic). The metal-loaded organic phase can be back-extracted with dilute acid (e.g., 1–2 M H₂SO₄), enabling metal recovery and regenerating the extractant.
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
What is the molecular formula and appearance of Kelex-100?
Kelex-100 has the molecular formula C₂₀H₂₉NO and typically appears as a dark reddish-brown viscous liquid with a purity of ≥97%.
How does the extraction mechanism of Kelex-100 work?
Extraction occurs through dual mechanisms: cation exchange in neutral or weakly acidic conditions, and anion exchange in strongly acidic media. The metal-loaded organic phase can then be back-extracted using a dilute acid such as 1–2 M H₂SO₄.
What are the primary applications of Kelex-100 in hydrometallurgy?
It is primarily used for Gallium (Ga) recovery from the Bayer process, Copper/Zinc/Cadmium separation in acidic media, Germanium (Ge) extraction, and the separation of precious metals and rare earth elements like cobalt and nickel.
Are Kelex-100 and Chelex 100 the same product?
No, they are different. Kelex-100 is a liquid extractant, whereas Chelex 100 is a solid chelating resin branded by Bio-Rad used in molecular biology. They have completely different formulations and applications.
What are the storage and safety precautions for Kelex-100?
It must be stored refrigerated at 2–8°C, tightly sealed, and protected from light. Because it irritates the skin, eyes, and respiratory tract, handlers must use protective eyewear, chemical-resistant gloves, and work within a fume hood.