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China Kelex-100 Suppliers | Factory Direct Alkylated 8-Hydroxyquinoline Chelating Extractant for Hydrometallurgy
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)
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 (FAQ)
Q: What is the molecular formula and weight of Kelex-100?
A: Kelex-100 has a molecular formula of C₂₀H₂₉NO and a molecular weight of 299.46.
Q: What are the recommended storage conditions for this product?
A: It should be stored refrigerated at temperatures between 2–8°C, tightly sealed, and protected from light.
Q: Which metal ions can Kelex-100 selectively extract?
A: It exhibits strong chelating capacity for metal ions such as gallium, copper, zinc, cadmium, germanium, and cobalt, while maintaining extremely low selectivity for monovalent ions.
Q: How are metals recovered after the extraction process?
A: The metal-loaded organic phase can be back-extracted using a dilute acid (such as 1–2 M H₂SO₄) to recover the metals and regenerate the extractant.
Q: Is Kelex-100 the same as Chelex 100?
A: No. Kelex-100 is a liquid extractant, whereas Chelex 100 is a solid chelating resin branded by Bio-Rad used in molecular biology. They have entirely different formulations and applications.
Q: What safety precautions should be followed during handling?
A: Due to its irritancy to the skin, eyes, and respiratory tract, you must wear protective eyewear and chemical-resistant gloves, and operate within a fume hood.