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Kelex-100 Chelating Extractant CAS 73545-11-6 - China Suppliers and Factory for Metal Solvent Extraction
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Kelex-100 Chelating Extractant CAS 73545-11-6 - China Suppliers and Factory for Metal Solvent Extraction

Kelex-100 (CAS: 73545-11-6), also known as 7-(4-ethyl-1-methyloctyl)-8-hydroxyquinoline or EMBQ, is a specialized alkylated 8-hydroxyquinoline chelating extractant. This versatile compound is extensively utilized in hydrometallurgy and metal separation processes. As a leading product from reputable suppliers in China, Kelex-100 is manufactured in advanced factories, ensuring high-quality standards and efficiency for various industrial applications. Discover how our premium-grade Kelex-100 can enhance your metal extraction processes today!
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    Product Detail

    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)
    1. Gallium (Ga) recovery

    Selective extraction of gallium from alkaline Bayer‑process mother liquor of bauxite, one of the mainstream industrial processes.

    2. Separation of copper/zinc/cadmium

    Efficient extraction of copper, zinc and cadmium in acidic medium for ore leachate and wastewater treatment.

    3. Germanium (Ge) extraction

    Separation and enrichment of germanium from acidic solutions of coal‑fired ash, zinc smelting slag, etc.

    4. 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
    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.
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    Frequently Asked Questions
    What is the CAS registry number and molecular formula of Kelex-100?
    Kelex-100 has the CAS number 73545-11-6 and a molecular formula of C20H29NO, with a molecular weight of 299.46.
    What are the primary hydrometallurgical applications of this extractant?
    It is primarily used for Gallium (Ga) recovery from alkaline Bayer-process mother liquor, separation of copper, zinc, and cadmium in acidic media, Germanium (Ge) extraction from ash/slag solutions, and the separation/purification of precious metals and rare-earth elements like cobalt and nickel.
    How does the extraction and regeneration mechanism work?
    Extraction occurs via dual mechanisms: cation exchange in neutral/weakly acidic environments and anion exchange in strongly acidic environments. Once loaded, the organic phase can be stripped with dilute acid (such as 1–2M H₂SO₄) to recover the target metal and regenerate the extractant.
    How should Kelex-100 be safely stored and handled?
    It should be refrigerated at 2-8°C in sealed, dark conditions. Because it is irritating to the skin, eyes, and respiratory tract, it must be handled inside a fume hood using safety goggles and chemical-resistant gloves. Avoid contact with strong oxidants, strong acids, and strong alkalis at high temperatures.
    Are Kelex-100 and Chelex 100 the same product?
    No, they are completely different. Kelex-100 is a liquid extractant mainly used for liquid-liquid extraction in industrial hydrometallurgy, while Chelex 100 is a solid chelating resin (produced by Bio-Rad) used for molecular biology and laboratory scale purification.