P113 (TRPO) Trialkylphosphine Oxide Extractant
Application Scope
P113, also known as TRPO (Trialkylphosphine Oxide) and Cyanex 923 Equivalent, is a high-efficiency liquid neutral phosphine oxide extractant designed for strategic metal recovery and advanced hydrometallurgical purification. Its main industrial applications focus on gallium, germanium, indium enrichment, tungsten-molybdenum separation, and rhenium recovery.
In zinc smelting residues, aluminum industry red mud, and rare metal wastewater treatment, P113 provides selective extraction capability for low-concentration gallium, germanium, and indium resources. It helps improve the utilization value of scattered metals by enabling efficient enrichment and recovery from complex industrial streams.
For tungsten and molybdenum hydrometallurgy, P113 demonstrates stable separation performance in mixed leaching solutions and supports purification of tungsten and molybdenum intermediate products. It is also applied for rhenium enrichment from copper-molybdenum smelting flue dust and related waste solutions, assisting the recovery of valuable secondary resources.
As secondary industrial applications, P113 can support fine impurity removal in specific metallurgical systems, including arsenic removal from copper electrolyte and organic component recovery from industrial wastewater. It does not have mature commercial applications in lithium, copper-nickel-cobalt beneficiation, or tantalum-niobium separation processes.
Mechanism
P113 operates through a neutral solvent extraction mechanism based on the polar P=O functional group of phosphine oxide molecules. The active phosphorus-oxygen structure forms stable neutral coordination complexes with target metal ions in aqueous solutions.
Compared with traditional solid TOPO extractants, P113 features a mixed trialkyl molecular structure that provides improved compatibility with hydrocarbon diluents. This structure enables stable phase separation, reduces third-phase formation risks, and supports continuous industrial extraction cycles.
Through molecular solvation and selective coordination, P113 achieves effective extraction of high-value scattered metals, tungsten, molybdenum, and rhenium under suitable hydrometallurgical conditions.
Physicochemical Properties
P113 is a liquid neutral phosphine oxide extractant with excellent solvent compatibility, low water solubility, and stable thermal performance. Its physical characteristics allow flexible formulation with conventional hydrocarbon diluents for industrial solvent extraction circuits.
Specifications
| Parameter | Specification |
|---|---|
| CAS Number | 68937-55-3 |
| Product Name | P113 (TRPO) Trialkylphosphine Oxide |
| Active Content | ≥93% |
| Average Molecular Weight | 348 |
| Appearance | Colorless transparent liquid |
| Specific Gravity (25℃) | 0.88 |
| Viscosity | 40.0 cP (25℃); 13.7 cP (50℃) |
| Freezing Point | -5～0℃ |
| Flash Point | 182℃ |
| Autoignition Temperature | 281℃ |
| Boiling Point | 310℃ (50mmHg) |
| Water Solubility | ≤10 mg/L |
Storage & Handling
P113 should be stored in a cool, dry, and well-ventilated warehouse away from high temperatures, open flames, and strong oxidizing materials. Keep containers tightly sealed to prevent contamination and maintain product stability.
The product has good compatibility with conventional hydrocarbon diluents and can be prepared for industrial solvent extraction applications. During handling and operation, operators should avoid direct contact with skin and eyes and use appropriate chemical protective equipment.
Advantages / Limitations
Advantages
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High extraction efficiency for gallium, germanium, indium, tungsten, molybdenum, and rhenium recovery.
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Excellent compatibility with hydrocarbon diluents compared with traditional solid TOPO extractants.
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Low water solubility reduces reagent loss during long-term solvent extraction operation.
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Stable phase separation performance suitable for continuous hydrometallurgical production.
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Strong adaptability for low-concentration strategic metal recovery from industrial secondary resources.
Limitations
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P113 is mainly positioned for scattered metals, tungsten-molybdenum processing, and rhenium recovery applications.
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It does not provide competitive advantages for mainstream base metal extraction or tantalum-niobium industrial separation.
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Application performance depends on feed composition and hydrometallurgical process conditions.
Summary
P113 (TRPO) Trialkylphosphine Oxide Extractant is a high-performance neutral phosphine oxide reagent for strategic metal recovery and hydrometallurgical purification. With primary applications in gallium-germanium-indium enrichment, tungsten-molybdenum separation, and rhenium recovery, it provides stable extraction performance for complex industrial solutions.
Its excellent low-temperature solubility, strong solvent compatibility, low reagent loss, and stable chemical properties make P113 a reliable extractant for modern smelting enterprises focused on scattered metal recycling and advanced mineral processing.
P113 (TRPO Cyanex 923 Equivalent) – FAQ
Q1. What is the optimal acidity range for extracting gallium, germanium, and indium with P113 in hydrochloric acid systems?
P113 (TRPO Cyanex 923 equivalent) is a neutral organophosphorus extractant widely studied for the separation and recovery of gallium, germanium, and indium from acidic chloride solutions. The optimal acidity window depends on the metal concentration, chloride level, impurity composition, and organic phase formulation. In industrial hydrometallurgical operations, hydrochloric acid concentration is typically adjusted through laboratory solvent extraction tests to determine distribution coefficients and separation factors. Parameters such as phase ratio, extraction stages, and temperature should also be evaluated to achieve stable metal transfer while minimizing co-extraction of impurities.
P113 can provide selective extraction performance for gallium, germanium, and indium recovery from complex zinc hydrometallurgical solutions. The separation efficiency depends on the chemical form of target metals, acidity conditions, impurity concentration, and the presence of competing ions such as arsenic and antimony species. Before industrial application, solution purification steps and laboratory batch tests are normally recommended to evaluate impurity behavior. Proper control of extraction acidity, organic formulation, and scrubbing stages can help reduce unwanted co-extraction and improve the quality of the loaded organic phase.
P113 can be evaluated in combination with other neutral extractants such as TBP when processing complex solutions containing high iron concentrations. Synergistic extraction systems may improve metal loading characteristics or modify selectivity depending on the solution chemistry and operating conditions. However, the actual performance depends on factors including acid concentration, iron oxidation state, metal concentration, and organic phase composition. Laboratory solvent extraction screening is recommended to determine whether P113/TBP combinations provide advantages compared with single-extractant systems for specific indium recovery processes.
P113 generally demonstrates good compatibility with acidic chloride hydrometallurgical systems when properly formulated and operated under suitable conditions. In high-chloride solutions, factors such as chloride concentration, temperature, impurities, and organic phase composition may influence extraction behavior, phase separation, and long-term stability. Industrial solvent extraction circuits should include monitoring of organic losses, phase disengagement characteristics, and possible crud formation. Pilot testing under actual process conditions is recommended to confirm operational stability before continuous production use.
Acidity is one of the key operating parameters influencing metal extraction equilibrium and separation selectivity when using P113 in continuous counter-current solvent extraction systems. Changes in acid concentration can affect the chemical species present in solution, metal distribution coefficients, and impurity behavior. Industrial optimization normally requires evaluation of extraction, scrubbing, and stripping stages under controlled acidity conditions. Parameters including organic-to-aqueous ratio, residence time, and stage number should be optimized together to achieve stable recovery performance and consistent product quality.
The stripping conditions for P113-loaded organic phases depend on the target metal, loading level, and downstream recovery requirements. Acid concentration, stripping reagent selection, phase ratio, and the number of stripping stages all influence metal recovery efficiency. For gallium, germanium, and indium recovery circuits, laboratory stripping tests are typically conducted to identify suitable hydrochloric acid, sulfuric acid, or other stripping systems. The objective is to achieve effective metal transfer into the aqueous phase while maintaining organic phase stability for recycling and reuse.
During the recovery of dispersed metals such as gallium, germanium, and indium, trace elements including selenium and tellurium may influence solvent extraction performance depending on their chemical forms and solution conditions. Control strategies usually include optimization of feed purification, acidity adjustment, scrubbing stages, and selective stripping procedures. P113 application should be evaluated through systematic solvent extraction testing to determine impurity distribution behavior. Proper process design can help improve target metal selectivity while reducing contamination of the loaded organic phase.
P113 can be considered for industrial solvent extraction applications where operating temperature is carefully controlled. Temperature affects extraction equilibrium, phase separation, viscosity, and long-term organic stability. Operation above 50°C requires evaluation of thermal stability, organic loss rate, and equipment compatibility under actual process conditions. Continuous pilot testing is recommended to determine suitable temperature limits and operating parameters. Maintaining appropriate temperature control can help ensure consistent extraction performance and extend the service life of the organic phase.
P113 and N263 represent different extractant chemistries and may be evaluated in combined solvent extraction systems for complex metal separation applications. In zinc and copper hydrometallurgical solutions, mixed extractant systems can potentially improve selectivity or provide different extraction characteristics compared with individual reagents. The effectiveness depends on metal concentration, acidity, impurity profile, and circuit design. Detailed laboratory and pilot-scale testing is required to determine the appropriate formulation, extraction stages, and stripping conditions for specific gallium, germanium, and indium recovery processes.
Achieving high-purity dispersed metal products with P113 requires coordinated control of feed purification, extraction selectivity, scrubbing efficiency, stripping conditions, and downstream refining processes. Important parameters include solution acidity, metal concentration, organic-to-aqueous ratio, extraction stage number, temperature, and impurity control. P113 serves as a separation reagent within the overall hydrometallurgical process, and final product quality depends on complete circuit optimization rather than a single chemical factor. Laboratory testing and pilot validation are recommended before industrial implementation to establish reliable operating conditions.
Q2. How selective is P113 for gallium, germanium, and indium extraction from zinc leaching solutions containing arsenic and antimony impurities?