Triphenyl phosphate

  • Phosphorsäuretriphenylester
  • TPP
  • TPHP

Colorless crystals with phenolartigem odor

Fixed

1.18 g · cm -3

49.4 ° C

400 ° C ( 220 ° C at 5 hPa)

8.8 MPa (100 ° C)

  • Practically insoluble in water (2 mg · l-1 at 20 ° C) and gasoline
  • Soluble in ethanol, benzene, diethyl ether, chloroform, acetone

Attention

3500 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search available

Triphenyl phosphate (TPP or TPHP ) is a chemical compound consisting of colorless to white, odorless platelets in the pure state. It is mainly used as a plasticizer and a flame retardant. Triphenyl phosphate is a fish poison, it inhibits the enzyme acetylcholinesterase. It is made from phosphorus oxychloride and phenol.

Properties

TPP is hydrolyzed in alkaline solution to give diphenyl phosphate and phenol. The thermal decomposition starts at 600 ° C, but is not yet complete at 1000 ° C. Trace amounts of TPP in the environment originate from the hydraulic oil leaks and the combustion of plastic materials and can be detected anywhere.

Use

Mainly used TPP as flame retardants in electrical and automotive components. In addition, it is as a plasticizer for cellulose acetate resins ( celluloid ), where an intentional side-effect being the induced severe flammability. In addition, TPP component of hydraulic oils and lubricants.

CAS registry number PubChem Vapor pressure Dangerous Substances Directive (67/548/EEC) Hydrolysis Digital Object Identifier
648380
de