7-(4-Ethyl-1-methyloctyl)-8-hydroxyquinoline (Kelex-100)

7-(4-Ethyl-1-methyloctyl)-8-hydroxyquinoline (CAS Number: 73545-11-6), also known as Kelex-100. The molecule is pale yellow to amber viscous oily liquid at room temperature, with low water solubility and high solubility in organic diluents like kerosene or alcohols commonly used in solvent extraction circuits.

It is a powerful lipophilic chelating agent widely used in hydrometallurgy for selective metal extraction and separation. This specialized 8-hydroxyquinoline derivative offers exceptional performance in solvent extraction processes, particularly for copper and other valuable metals from aqueous solutions.

Technical Specifications

Package & Storage

• Net weight 200kg iron drum or 5kg/20kg fluorinated barrel.
• Store the container tightly closed in a dry, cool and well-ventilated place. Store apart from foodstuff containers or incompatible materials.

Key Benefits of 7-(4-Ethyl-1-methyloctyl)-8-hydroxyquinoline (Kelex-100)

High Selectivity:
Excellent selectivity for copper over other metals in acidic or ammoniacal solutions.

Strong Chelating Power:
Forms stable, extractable complexes with divalent and trivalent metal ions.

Excellent Phase Behavior:
Provides fast kinetics, good phase disengagement, and low entrainment in solvent extraction systems.

Chemical Stability:
Resistant to hydrolysis and degradation under typical operating conditions in hydrometallurgical plants.

Versatile Applications:
Suitable for both copper recovery from leach liquors and specialized metal separations.

Lipophilic Nature:
The 4-ethyl-1-methyloctyl group ensures high solubility in hydrocarbon diluents without requiring modifiers in many systems.

Primary Applications and Uses

Hydrometallurgy and Metal Extraction

• Copper Solvent Extraction (SX): Widely used for extracting copper from acidic sulfate or chloride leach solutions in mining operations.
• Selective Metal Recovery: Effective for separating copper, iron, and other metals in complex aqueous feeds.
• Uranium and Rare Earth Processing: Applied in certain specialized extraction circuits involving 8-hydroxyquinoline-based reagents.

Industrial and Analytical Uses

• Chelating ion exchanger in liquid-liquid extraction systems.
• Component in formulations for metal ion separation and purification.
• Research applications in coordination chemistry and development of new extractants.

Frequently Asked Questions (FAQs)

Q: What is the CAS number for this compound?
A: The CAS Registry Number is 73545-11-6.

Q: What is the common trade name for 7-(4-Ethyl-1-methyloctyl)-8-hydroxyquinoline?
A: It is commonly known as Kelex-100, the active component used in solvent extraction.

Q: Is this compound used for copper extraction?
A: Yes. It is a well-established chelating extractant specifically designed for selective copper recovery in hydrometallurgical solvent extraction processes.

Q: What metals does it extract effectively?
A: It shows strong affinity for copper (Cu²⁺) and is also effective with other metals such as iron (Fe³⁺) depending on pH and conditions. It is primarily valued for its copper selectivity.

Q: How should it be stored?
A: Store in tightly closed containers in a cool, dry, and well-ventilated area. Protect from moisture and extreme temperatures. Follow standard chemical storage guidelines for corrosive liquids.

Q: Is it water-soluble?
A: No. It has very low solubility in water but excellent solubility in organic diluents used in solvent extraction systems.

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