Tributyl Phosphate CAS 126-73-8

Tributyl phosphate (TBP) is a chemical compound with the formula (C4H9O)3PO and CAS 126-73-8. It is a colorless to yellowish liquid with a distinctive odor, commonly used in various industrial applications due to its unique properties. Primarily, TBP is recognized for its solvent capabilities, particularly in extracting specific metals from aqueous solutions. This makes it indispensable in nuclear reprocessing, where it aids in the separation of uranium and plutonium from spent nuclear fuel.

Chemically, TBP exhibits high stability and is resistant to hydrolysis, which contributes to its suitability for use in harsh environments. Its solvating power arises from its ability to form complexes with metal ions, facilitating their transfer from aqueous to organic phases. This selective extraction process is crucial for the purification and recycling of radioactive materials.

Beyond nuclear applications, TBP finds uses in the manufacturing of plastics, lubricants, and flame retardants. It serves as a plasticizer in certain polymers, enhancing flexibility and durability. In the lubricant industry, it helps formulate high-performance oils that can withstand extreme temperatures and pressures. As a flame retardant, TBP contributes to improving the safety of materials by retarding the spread of fire.

However, despite its industrial utility, TBP poses environmental and health concerns. It is classified as a toxic and hazardous substance, requiring careful handling and disposal to prevent contamination of soil and water resources. Exposure to TBP can lead to respiratory irritation, skin sensitization, and potential long-term health effects if not managed properly.

In summary, it is a versatile chemical with significant applications in nuclear reprocessing, plastics manufacturing, and lubricant formulation. While its industrial benefits are substantial, appropriate safety measures must be implemented to mitigate associated risks.

Tributyl Phosphate (TBP) is an organic phosphorus compound that is covalently bonded to phosphorus atoms through three n-butyl chains. Its unique low surface tension, excellent solubility, and chemical stability make it irreplaceable in various fields such as nuclear industry, rare metal extraction, chemical synthesis, environmental governance, and materials science.

Nuclear industry: key role of radioactive element separation

 

Plays the role of a core extractant in the nuclear fuel cycle, achieving efficient separation through coordination with metal ions:
Recovery of uranium and plutonium: In nuclear fuel reprocessing, TBP forms an organic phase with kerosene. When it comes into contact with an aqueous phase containing nitric acid, the oxygen atoms in its phosphorus oxygen bond form neutral complexes with uranyl ions (UO ₂² ⁺) or plutonium ions (Pu ⁴⁺), achieving separation from fission products. For example, the UP2-800 reprocessing plant in France uses TBP to purify uranium, with a recovery rate of over 99.9% and a purity of 99.95%, meeting the manufacturing standards for nuclear reactor fuel rods.

 

Extraction of Neptunium: In fast neutron reactors, TBP can extract neptunium-237 from spent fuel for the proliferation of fissile material plutonium-239, improving nuclear fuel utilization efficiency.
Nuclear waste treatment: TBP can extract long-lived radioactive nuclides such as strontium-90 and cesium-137, reducing the radioactive toxicity of waste and shortening the storage period. For example, the Rokkamura post-treatment plant in Japan uses the TBP kerosene system to treat high-level radioactive waste, resulting in a separation coefficient of 10 ⁴ for strontium-90.

Rare metal extraction: the "blood" of high-tech industries

 

TBP achieves efficient separation and purification of rare metals through solvent extraction, supporting strategic industries such as electronics and aerospace
Extraction of Cobalt and Nickel: In the leaching solution of copper cobalt ore, TBP and P204 (di - (2-ethylhexyl) phosphate) synergistically extract cobalt, with a separation coefficient of 10 ³ and a cobalt recovery rate of over 95%. For example, the cobalt smelter in the Democratic Republic of Congo uses the TBP-P204 system to purify battery grade cobalt salts (Co ≥ 99.8%) from a slurry containing 0.5% cobalt.

 

Lithium separation: In high magnesium lithium ratio salt lake brine, TBP combines with ferric chloride to form a synergistic extraction system, selectively extracting lithium ions with a lithium magnesium separation coefficient of over 50. Qinghai Salt Lake Industry Co., Ltd. has applied this technology to increase the lithium recovery rate from 30% to 85% and reduce the production cost of lithium carbonate by 40%.
Rare earth element separation: A mixed extractant composed of TBP and cycloalkanoic acid can separate light rare earths (such as cerium and lanthanum) from heavy rare earths (such as neodymium and europium) in lanthanide elements, with a purity of 99.99%, meeting high-end requirements such as permanent magnet materials and catalysts.

Chemical synthesis: a catalyst for reaction optimization

 

TBP improves synthesis efficiency and product quality by adjusting the properties of the reaction system
Defoamer: In the polymerization reaction, TBP can reduce the liquid surface tension to below 25 mN/m, and destroy the stability of foam film. For example, in the suspension polymerization of polyvinyl chloride (PVC), adding 0.1% TBP can reduce the volume of foam by 90%, shorten the reaction time by 20%, and make the particle size distribution more uniform.

 

Polymerization inhibitor: TBP inhibits the self polymerization reaction of acrylic monomers (such as methyl methacrylate) by capturing free radicals. Experiments have shown that adding 0.5% TBP can extend the storage period of monomers from 3 months to 12 months and increase the polymerization conversion rate by 15%.
Solvent and plasticizer: TBP can dissolve insoluble resins such as nitrocellulose and cellulose acetate, improving the flowability of coatings. For example, in wood coatings, TBP serves as the main plasticizer, increasing the flexibility of the coating by 30% and achieving a cold resistance of -40 ℃ without cracking.

Environmental governance: the 'cleaner' of pollution control

 

TBP achieves efficient removal of pollutants through physical adsorption and chemical extraction
Wastewater treatment: In the production wastewater of phenolic resin, TBP can extract phenolic substances with a recovery rate of 90%. After purification, the COD (chemical oxygen demand) of the wastewater is reduced from 5000 mg/L to below 100 mg/L. For example, a chemical plant in Shandong Province uses tributyl phosphate extraction technology, which reduces phenolic emissions by 120 tons annually and saves 3 million yuan in raw material costs.

 

Exhaust gas purification: TBP is loaded onto activated carbon fibers and can adsorb acidic gases (such as SO ₂, NO ₓ) and volatile organic compounds (VOCs). Experiments have shown that the adsorption capacity for benzene derivatives reaches 150 mg/g, which is twice that of traditional activated carbon.
Soil remediation: TBP combined with surfactants can extract heavy metals (such as cadmium and lead) from soil, with an extraction rate of over 80%. After remediation, the soil meets the standards for agricultural land.

Materials Science: An Additive for Performance Enhancement

 

TBP modifies the molecular structure of materials to endow them with special properties:

Plastic plasticization: Adding 5% TBP to PVC can reduce the glass transition temperature (Tg) from 80 ℃ to -20 ℃, increase tensile strength by 20%, and is suitable for manufacturing cold resistant pipes and cable sheaths.

 

Lubricant additive: TBP combined with base oil can form a boundary lubricating film, improve wear resistance by 50%, and extend equipment life. For example, the application of TBP lubricant in wind turbine gearboxes reduces the failure rate by 60% and extends the maintenance cycle to 3 years.
Heat exchange medium: TBP has a wide range of boiling point (289 ℃) and solidification point (-80 ℃), good thermal stability, and can be used as a coolant for solar collectors or nuclear reactors. Its heat transfer efficiency is 30% higher than that of water.

Other fields: "versatile" for cross industry applications

 

Gas chromatography stationary phase: TBP is used as a stationary phase with a maximum operating temperature of 120 ℃. It can separate volatile organic compounds (such as benzene and toluene) with a separation degree of over 1.5, and is widely used in environmental monitoring and food safety testing.

Pesticide additive: TBP can enhance the wettability of pesticides on plant surfaces, reducing the contact angle of the solution from 120 ° to 30 ° and increasing the utilization rate by 20%. For example, adding TBP to herbicides can increase weed control effectiveness by 15% and reduce pesticide use by 30%.
Battery electrolyte: In lithium-ion batteries, TBP as an additive can inhibit electrolyte decomposition, extend cycle life to over 2000 times, and achieve a capacity retention rate of 85%.

Tributyl phosphate (TBP), a liquid inorganic ester with the chemical formula (C4H9)3PO4, has garnered significant attention in recent years due to its widespread use and potential toxic effects. As an alkyl organophosphate flame retardant (OPFR), TBP has been extensively employed in the manufacturing industry as an alternative to traditional brominated flame retardants. However, its environmental impact has raised concerns and become a focal point of research in the field of new organic pollutants.

Studies have shown that TBP is frequently detected in various environmental media, including air, water, and soil. This substance can accumulate in organisms through inhalation, dietary intake, or dermal contact. The bioaccumulation of TBP in living beings can lead to toxic effects, posing potential risks to both ecosystems and human health.

Research on the toxicity of TBP has revealed several key findings. Firstly, TBP exhibits bioaccumulation in organisms, meaning it tends to accumulate in biological tissues over time. This accumulation can reach harmful levels, leading to adverse health effects. Secondly, TBP has been shown to have toxic effects on a range of organisms, including aquatic species, terrestrial animals, and potentially humans. These effects can include disruptions to reproductive and endocrine systems, as well as neurological damage.

To address the issue of TBP contamination, researchers have explored various treatment methods. One promising approach is the use of supercritical water oxidation (SCWO), which has been shown to effectively degrade TBP into harmless products such as CO2, CO3(3-). This technology offers a feasible solution for the proper disposal of TBP waste, contributing to the sustainable development of industries that use this substance.

In conclusion, the toxicity of TBP is a significant concern due to its widespread use and potential impacts on ecosystems and human health. Ongoing research is essential to fully understand the mechanisms of toxicity and to develop effective treatment methods for TBP contamination.

Tributyl phosphate is referred to as TBP. Molecular formula C12H27PO4, structural formula (C4H9O)3P=O. It is a colorless and odorless liquid, with a melting point of -80℃, a boiling point of 289℃ (decomposition), a relative density of 0.973~0.978 (20/4℃), and a refractive index of 1.4215 (25℃). It is stable to light, miscible with a variety of organic solvents, and difficult to dissolve in water. It is prepared by esterification of n-butanol phosphorus oxychloride. It is a typical neutral complexing extractant. Because of its stable properties and resistance to strong acids, strong alkalis, strong oxidants and strong radiation, it is widely used in the nuclear fuel and metallurgical industries. TBP has the largest tonnage of extractants in the world. It can extract uranium from nitric acid solution and is the most important extraction system in the nuclear fuel industry. Uranium is the first metal to be extracted and purified by extraction in industry. Uranium purification plants in the United States, Britain and other countries all use TBP extraction systems. Because it is compatible with nitrocellulose, acetate, phenolic resin, polymethyl methacrylate resin, etc., it can be used as a plasticizer for them, making these products cold-resistant and light-resistant. However, compared with other plasticizers, it has a lower boiling point and greater volatility, so its use is limited. In most cases, it can also be used as a solvent for coatings and adhesives. TBP is moderately toxic (median lethal dose is 3 grams/kg body weight) and is generally not allowed to be used in products that come into direct contact with food. The U.S. Food and Drug Administration permits it to be used as an adhesive for food packaging materials. It has a certain flame retardancy and can be used as a flame retardant for some resins.

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