298-07-7 Usage
Description
Bis(2-ethylhexyl) phosphate, also known as DEHP, is an odorless, light yellow liquid that is insoluble in water and has a clear colorless to light yellow appearance. It is a widely used industrial chemical with various applications across different industries.
Uses
Used in Lubrication Oils:
Bis(2-ethylhexyl) phosphate is used as a lubricant additive for improving the performance and efficiency of lubrication oils. It enhances the lubrication properties and reduces wear and tear on machinery.
Used as a Corrosion Inhibitor:
This chemical is employed as a corrosion inhibitor to protect metals from rusting and other forms of corrosion. It forms a protective layer on the metal surface, preventing contact with corrosive agents and extending the life of the metal.
Used as an Antioxidant:
Bis(2-ethylhexyl) phosphate serves as an antioxidant, preventing the oxidation of materials and extending their shelf life. It is particularly useful in the plastics and rubber industries, where it helps maintain the quality and durability of the products.
Used in Hydrometallurgical Separation:
Bis(2-ethylhexyl) phosphate is used as an extractant in the hydrometallurgical separation of cobalt and nickel. It aids in the efficient extraction and separation of these valuable metals from their ores.
Used in Metal Extraction and Separation:
This chemical is involved in the solvent extraction of uranium salts and rare earth metals. It also facilitates the extraction of iron(II) ions after the reduction of iron(III) ions, making it a valuable component in the metal extraction process.
Used in the Synthesis of Plastics:
Bis(2-ethylhexyl) phosphate is used as an intermediate for wetting agents and detergents, as well as a feedstock for chemical synthesis. It plays a crucial role in the production of various plastic materials.
Used as a Plasticizer:
This chemical is employed as a plasticizer, enhancing the flexibility and workability of plastics. It is particularly useful in the production of polyvinyl chloride (PVC) and other plastic materials.
Used as a Solvent:
Bis(2-ethylhexyl) phosphate is used as a solvent in the synthesis of plastic, aiding in the chemical reactions and processes involved in the production of various plastic materials.
Used as a Cation Extracting Agent:
This chemical acts as a cation extracting agent, facilitating the separation and extraction of metal ions from solutions. It is particularly useful in the purification and concentration of metal ions in various industrial processes.
Production Methods
Produced by chlorinating bis(2-ethylhexyl) phosphonate
to give the phosphate diester chloride, followed by hydrolysis,
or by saponification of tris(2-ethylhexyl) phosphate
.
Reactivity Profile
Organophosphates, such as Bis(2-ethylhexyl) phosphate, are susceptible to formation of highly toxic and flammable phosphine gas in the presence of strong reducing agents such as hydrides. Partial oxidation by oxidizing agents may result in the release of toxic phosphorus oxides. Mildly corrosive to most metals; may form flammable hydrogen gas [USCG, 1999].
Health Hazard
Contact with liquid irritates eyes and may cause serious injury; consult an eye specialist. Also causes skin irritation on contact. Ingestion produces irritation similar to that caused by strong vinegar.
Fire Hazard
Special Hazards of Combustion Products: Irritating phosphorus oxides may be released.
Flammability and Explosibility
Nonflammable
Purification Methods
Contaminants of commercial samples include the monoester, polyphosphates, pyrophosphate, 2-ethylhexanol and metal impurities. Dissolve the acid in n-hexane to give an 0.8M solution. Wash this with an equal volume of M HNO3, then with saturated (NH4)2CO3 solution, with 3M HNO3, and twice with water [Petrow & Allen Anal Chem 33 1303 1961]. Similarly, the impure sodium salt, after scrubbing with pet ether, is acidified with HCl and the free organic acid is extracted into pet ether and purified as above [Peppard et al. J Inorg Nucl Chem 7 231 1958], or as described by Stewart & Crandall [J Am Chem Soc 73 1377 1951]. It can be purified via its copper salt [McDowell et al. J Inorg Nucl Chem 38 2127 1976]. [Beilstein 1 IV 1796.]
Check Digit Verification of cas no
The CAS Registry Mumber 298-07-7 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 2,9 and 8 respectively; the second part has 2 digits, 0 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 298-07:
(5*2)+(4*9)+(3*8)+(2*0)+(1*7)=77
77 % 10 = 7
So 298-07-7 is a valid CAS Registry Number.
InChI:InChI=1/C8H19O4P/c1-3-5-6-8(4-2)7-12-13(9,10)11/h8H,3-7H2,1-2H3,(H2,9,10,11)/p-1
298-07-7Relevant articles and documents
Solvent-free microwave synthesis of trialkylphosphates
Meddour-Boukhobza, Laaldja,Elias, Abdelhamid,Didi, Mohamed A.
, p. 255 - 259 (2014/06/23)
Trialkylphosphates are synthesized from alcohols by reaction with reactive phosphorus oxychloride under microwave irradiations and classical heating. Effects of these irradiations on the nature of the products and on the yield are studied. The compounds were characterized by their spectroscopic data and elemental analysis. The obtained results show that the products of these reactions are essentially trialkylphosphates and alkylphosphoric acids. They always show as the nature of the formed products and the yields in trialkylphosphates are comparable to those obtained in the classical conditions of heating. The speed of the reaction was increased by a factor from 40 to 120.
Convenient preparation of long-chain dialkyl phosphates: Synthesis of dialkyl phosphates
Aitken, R. Alan,Collett, Chris J.,Mesher, Shaun T. E.
, p. 2515 - 2518 (2012/09/05)
Reaction of phosphorus oxychloride with a primary alcohol (1.8 equiv) and triethylamine (1.8 equiv) in toluene, followed by filtration and treatment with steam, gives dialkyl phosphates in good yield and essentially free from trialkyl phosphate contamination. Georg Thieme Verlag Stuttgart · New York.
Determination of phosphoric acid mono- and diesters in municipal wastewater by solid-phase extraction and ion-pair liquid chromatography-tandem mass spectrometry
Quintana, Jose Benito,Rodil, Rosario,Reemtsma, Thorsten
, p. 1644 - 1650 (2008/02/05)
The first analytical method for the determination of 13 phosphoric acid mono- and diesters from aqueous samples is presented. The method consists of solid-phase extraction (SPE) and ion-pair liquid chromatographic separation with tri-n-butylamine coupled to electrospray ionization tandem mass spectrometry in the negative ion mode. Due to a lack of pure standards, only 3 of the 13 esters could be quantified. SPE recoveries ranged from 71 to 112% for di-n-butyl phosphate, diphenyl phosphate, and di-(2-ethylhexyl) phosphate (DEHP) with limits of quantification from 7 to 14 ng/L for 100-mL samples. At analyte concentrations ≥1 μg/L, aqueous samples can be analyzed by direct injection without extraction. In municipal wastewater, six diesters and one monoester were unambiguously identified by comparison with synthesized reference material. DEHP showed highest concentrations of 60 and 5 μg/L in raw and treated wastewater, respectively. The detection of monoethylhexyl phosphate was confirmed by LC-Q-TOF-MS analysis, and it was found at a concentration level comparable to DEHP. Laboratory degradation tests show that phosphoric acid diesters can be formed as intermediates in the microbial degradation of trialkyl phosphates that are being used as flame retardants and plasticizers.