Get the Best Tetraoctylphosphonium Bromide for Your Process – From Aure Chemical
Tetraoctylphosphonium Bromide (TOPB) (CAS 23906-97-0) is a specialized quaternary phosphonium salt characterized by four long C₈ octyl chains. It typically appears as a white to off-white, waxy crystalline solid with minimal odor. The extended alkyl chains confer exceptional lipophilicity and high molecular weight to the phosphonium cation. This makes TOPB highly effective as a Phase-Transfer Catalyst (PTC) for reactions involving extremely non-polar organic media, and crucially, as a superior extractant and phase separator for complex metal ions, particularly in the demanding fields of hydrometallurgy and rare-earth element (REE) recovery. TOPB's thermal stability also makes it a key precursor for advanced ionic liquids.
Basic Information of TOPB
Meticulously produced and rigorously tested to meet stringent quality standards. We ensure exceptional purity and consistent performance, essential for your critical applications:
| CAS No.: | 23906-97-0 |
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| EC No.: | 245-935-7 |
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| Linear Formula: | C32H68BrP |
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| Molecular Weight: | 563.76 |
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| Appearance: | White to off-white crystalline solid/waxy powder |
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| Melting Point: | 38-43 °C(lit.) |
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| Solubility: | Negligible in water; highly soluble in non-polar solvents (hexane, toluene, oils), alcohol, and chloroform. |
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| Flash Point: | >230 °F |
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| RIDADR: | UN 3261 8/PG 3 |
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| Chemical Structure: |  |
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Application Overview
TOPB's pronounced lipophilicity makes it ideal for specialized applications that require strong partitioning into organic or non-polar phases:
Solvent Extraction (Hydrometallurgy): A primary component in advanced liquid-liquid extraction systems for the separation and recovery of valuable metals, particularly heavy metals, platinum-group metals (PGMs), and rare-earth elements (REEs), where its large, lipophilic cation forms stable, easily extractable ion pairs.
Phase-Transfer Catalyst (PTC): Used as a highly effective PTC in reactions involving highly non-polar organic solvents, where standard shorter-chain catalysts (like TBAB) are insufficiently soluble to bridge the two phases effectively.
Ionic Liquid Precursor: The tetraoctylphosphonium cation is synthesized into various advanced ionic liquids (ILs), imparting very high thermal stability, exceptional hydrophobicity, and low viscosity to the resulting IL for specialized high-temperature or non-aqueous electrochemical applications.
Polymer and Materials Science: Employed as a non-volatile stabilizer or additive in polymers and resins, often to enhance compatibility or to introduce specific ionic properties into non-polar matrices.
Why Choose Aure Chemical for Tetraoctylphosphonium Bromide?
Aure Chemical offers TOPB (CAS 23906-97-0) with unique quality assurance focused on maximizing its efficacy in high-purity separation and specialty materials manufacturing.
Metal-Free Purity Certification: Our TOPB is certified with guaranteed ultra-low levels of transition metal and heavy metal contamination (<5 ppm for key elements). This is non-negotiable for solvent extraction used in high-purity rare-earth or PGM recovery, ensuring zero cross-contamination.
High Lipophilicity Index (Log P Verified): We provide verified data on the material's lipophilicity index (log P) to help customers accurately model its partitioning behavior in their specific two-phase separation systems, ensuring predictable extraction efficiency.
Controlled Crystalline Morphology: We offer TOPB with a verified crystalline structure and consistent powder morphology. This control is vital for batch-to-batch consistency in dissolution and handling, especially in large-scale industrial mixing and separation processes.
Thermal Robustness Guarantee: We provide thermal stability data (TGA) to confirm its superior integrity at elevated temperatures, assuring customers that the catalyst will not degrade prematurely in demanding high-temperature PTC or IL preparation processes.
Hazards Classification
GHS Classification: Skin Corr. 1B (GHS05), Eye Dam. 1 (GHS05)
Hazard Statements: Causes severe skin burns and eye damage.
UN Number: UN 3261
Hazard Class: 8 (Corrosive substances)
Packing Group: III
GHS05: Corrosive
