51528-32-6

Basic information

• Product Name: ethylmethylphosphinic acid
• Synonyms: ethylmethylphosphinic acid;Einecs 257-254-2
• CAS NO: 51528-32-6
• Molecular Formula: C₃H₉O₂P
• Molecular Weight: 108.076121
• EINECS: 257-254-2
• Mol File: 51528-32-6.mol
• Article Data: 6

Chemical Properties

• Melting Point: 7-8 °C
• Boiling Point: 297.8°Cat760mmHg
• Flash Point: 133.9°C
• Appearance: /
• Density: 1.083g/cm³
• Vapor Pressure: 0.000316mmHg at 25°C
• Refractive Index: 1.403
• PKA: 3.04±0.50(Predicted)
• CAS DataBase Reference: ethylmethylphosphinic acid(CAS DataBase Reference)
• NIST Chemistry Reference: ethylmethylphosphinic acid(51528-32-6)
• EPA Substance Registry System: ethylmethylphosphinic acid(51528-32-6)

Safety Data

• Hazardous Substances Data: 51528-32-6(Hazardous Substances Data)

Usage

General Description

Ethylmethylphosphinic acid, also known as EMPA, is a chemical compound with the formula C3H9O2P. It is an organophosphorus compound that is primarily used as a chelating agent in the production of nuclear fuel reprocessing solvents. EMPA is also utilized as a complexing agent in the separation of actinides and lanthanides in hydrometallurgy processes. It is a colorless, water-soluble liquid that is highly toxic and should be handled with care. EMPA has also been studied for its potential use in the treatment of metal poisoning and as a precursor in the synthesis of various organic compounds. Due to its hazardous nature and potential applications in nuclear processes, it is highly regulated and controlled.

InChI:InChI=1/C3H9O2P/c1-3-6(2,4)5/h3H2,1-2H3,(H,4,5)

Upstream product

• 15715-41-0 methyldiethoxyphosphine 
• 74-85-1 ethene 
• 4206-94-4 methylphosphinic acid 
• 30405-01-7 methyl-ethyl-phosphinic acid isobutyl ester 
• 29786-16-1 ethyl-phosphonic acid-chloride dimethylamide 
• 676-58-4 methylmagnesium chloride 

Downstream Products

• 51528-37-1 ethylmethylphosphinic acid anhydride 

Relevant articles and documents

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Preparation method for methylethylphosphinic acid and aluminum salt thereof

The invention discloses a preparation method for methylethylphosphinic acid and an aluminum salt thereof, belonging to the technical field of organic synthesis. To reduce the production cost of methylethylphosphinic acid and improve the purity of methylethylphosphinic acid, the invention provides the preparation method for methylethylphosphinic acid and the aluminum salt thereof. The preparation method comprises the following steps: reacting dichloromethylphosphine with water to obtain an aqueous dichloromethylphosphine solution; with di-tert-butyl peroxide as an initiator, reacting the aqueous dichloromethylphosphine solution with ethylene so as to obtain methylethylphosphinic acid; and reacting the methylethylphosphinic acid with an aqueous solution of Al(SO).18HO to obtain the aluminum salt of methylethylphosphinic acid. According to the invention, the aqueous dichloromethylphosphine solution is directly used for preparing the methylethylphosphinic acid, reaction conditions are screened so as to realize high-yield preparation of high-purity methylethylphosphinic acid, and the high-purity methylethylphosphinic acid is directly used for preparing the aluminum salt of methylethylphosphinic acid; so the purification operation of each intermediate is eliminated, which allows production efficiency to be significantly improved and production cost to be reduced.

Process for preparing salts of dialkylphosphinic acids

The invention relates to a process for preparing salts of dialkylphosphinic acids, which comprisesa) reacting alkylphosphonous and/or hypophosphorous acid and/or alkali metal salts thereof with olefins in the presence of a free-radical initiator to give dialkylphosphinic acids and/or alkali metal salts thereof andb) reacting the dialkylphosphinic acids and/or alkali metal salts thereof obtained according to a) with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K to give the metal dialkylphosphinate salts.The invention likewise relates to the use of the metal dialkylphosphinate salts prepared by the process according to the invention for preparing flame retardants.