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Kelex-100 (EMBQ) Suppliers in China - Top Quality 7-(4-Ethyl-1-Methyloctyl)-8-Hydroxyquinoline Factory for Metal Separation

Kelex-100, known by its CAS number 73545-11-6, is a powerful alkylated 8-hydroxyquinoline chelating extractant, with the chemical name 7-(4-ethyl-1-methyloctyl)-8-hydroxyquinoline, commonly abbreviated as EMBQ. This versatile compound is extensively utilized in hydrometallurgy and metal separation processes, making it an essential product for various industries. As a leading supplier in China, our factory ensures the highest quality standards and reliability in every batch of Kelex-100, catering to the needs of manufacturers and researchers around the globe. Trust us for your sourcing needs and experience the benefits of working with a top-tier China supplier of high-performance chemical solutions

Product Detail

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)

Gallium (Ga) recovery: Selective extraction of gallium from the alkaline mother liquor of the Bayer process bauxite smelting, one of the mainstream industrial processes.

Copper/Zinc/Cadmium Separation: High-efficiency extraction of copper, zinc, and cadmium in acidic media, applicable for ore leaching solutions and wastewater treatment.

Germanium (Ge) extraction: Separation and enrichment of germanium from acidic solutions such as coal ash and zinc smelting slag.

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

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.

Common Confusion Alert

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

Q: What is the chemical structure and appearance of Kelex-100?

Kelex-100 has the molecular formula C₂₀H₂₉NO and a molecular weight of 299.46. It physically appears as a dark reddish-brown viscous liquid with a typical purity of ≥97%.

Q: What are the primary metals that Kelex-100 can extract?

Kelex-100 shows high selectivity and strong chelating capacity for metal ions such as gallium, copper, zinc, cadmium, germanium, and cobalt, while showing very low selectivity for monovalent ions.

Q: How does the dual functional group chelation mechanism work?

It utilizes a quinoline ring tertiary nitrogen (which protonates in acidic media to bind anions) and an 8-hydroxy group (which dissociates in neutral/alkaline media to bind metal cations). This allows efficient extraction across a wide pH range.

Q: What is the difference between Kelex-100 and Chelex 100?

Kelex-100 is a liquid extractant used primarily in hydrometallurgy. In contrast, Chelex 100 is a solid chelating resin branded by Bio-Rad used in molecular biology. They are completely different products.

Q: What are the storage requirements for Kelex-100?

Kelex-100 should be stored refrigerated at 2–8°C. It must be kept tightly sealed and protected from exposure to direct light.

Q: What safety precautions should be followed during handling?

Because it irritates the skin, eyes, and respiratory tract, handlers must use protective eyewear, chemical-resistant gloves, and operate within a fume hood. Avoid direct environmental discharge and keep away from strong acids, bases, or oxidizers at high temperatures.