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Dimethyl terephthalate

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Dimethyl terephthalate Basic information
Dimethyl terephthalate Chemical Properties
  • Melting point:140 °C
  • Boiling point:288 °C
  • Density 1,29 g/cm3
  • vapor density 1.04 (vs air)
  • vapor pressure 1.15 mm Hg ( 93 °C)
  • refractive index 1.4752
  • Flash point:154 °C
  • storage temp. Store below +30°C.
  • solubility water: slightly soluble0.0493g/L at 20°C
  • form Flakes or Pellets
  • color White
  • explosive limit0.8-11.8%(V)
  • Water Solubility It is slightly soluble in water but soluble in hot alcohol and ether.
  • Merck 14,9162
  • BRN 1107185
  • Stability:Stable. Incompatible with strong acids, strong bases, strong oxidizing agents.
  • CAS DataBase Reference120-61-6(CAS DataBase Reference)
Safety Information
  • Risk Statements 36/37/38
  • Safety Statements 24/25
  • RIDADR 3256
  • WGK Germany 1
  • RTECS WZ1225000
  • Autoignition Temperature520 °C DIN 51794
  • TSCA Yes
  • HS Code 2917 37 00
  • ToxicityLD50 orally in Rabbit: 3200 mg/kg
MSDS
Dimethyl terephthalate Usage And Synthesis
  • DescriptionDimethyl terephthalate (DMT) is an organic compound with the formula C6H4(CO2CH3)2. It is the diester formed from terephthalic acid and methanol. It is a white solid that melts to give a distillable colourless liquid.
  • Chemical Propertieswhite chunks
  • UsesDMT is used in the production of polyesters, including polyethylene terephthalate (PET) and poly trimethylene terephthalate. It consists of benzene substituted with carboxy methyl groups (CO2CH3) at the 1 and 4 positions. Because DMT is volatile, it is an intermediate in some schemes for the recyclic of PET, e.g. from plastic bottles.
    Hydrogenation of DMT affords the diol cyclo hexane dimethanol , which is a useful monomer.
  • UsesDimethyl terephthalate (DMT) is used in the production of polyesters, including polyethylene terephthalate (PET) and poly trimethylene terephthalate. It consists of benzene substituted with carboxy methyl groups (CO2CH3) at the 1 and 4 positions. Because DMT is volatile, it is an intermediate in some schemes for the recyclic of PET, e.g. from plastic bottles.
    Hydrogenation of DMT affords the diol cyclohexanedimethanol, which is a useful monomer.
  • Production MethodsDimethyl terephthalate (DMT) has been produced in a number of ways. Conventionally and still of commercial value is the direct esterification of terephthalic acid. Alternatively, it can be prepared by alternating oxidation and methyl-esterification steps from p-xylene via methyl-p-toluate.
  • General DescriptionWhite solid or heated colorless liquid. Has no odor. Liquid solidifies in cool water. Solid and liquid sink in water.
  • Air & Water ReactionsWhen mixed with air, the vapor or dust forms very hazardous and highly reactive mixtures. . Insoluble in water.
  • Reactivity ProfileDIMETHYL TEREPHTHALATE is an ester. Esters react with acids to liberate heat along with alcohols and acids. Strong oxidizing acids may cause a vigorous reaction that is sufficiently exothermic to ignite the reaction products. Heat is also generated by the interaction of esters with caustic solutions. Flammable hydrogen is generated by mixing esters with alkali metals and hydrides. Can generate electrostatic charges. [Handling Chemicals Safely 1980. p. 250]. DIMETHYL TEREPHTHALATE is sensitive to heat. The molten material reacts with water due to the temperature. DIMETHYL TEREPHTHALATE is incompatible with strong oxidizers, strong acids and strong bases.
  • Health HazardMolten DMT will cause severe burns of skin on contact.
  • Fire HazardDIMETHYL TEREPHTHALATE is combustible.
  • Safety ProfileModerately toxic by intraperitoneal route. Mdly toxic by ingestion. An eye irritant. Mutation data reported. When heated to decomposition it emits acrid smoke and irritating fumes
  • Purification MethodsPurify it by recrystallisation from aqueous EtOH, MeOH or CCl4; or by zone melting. [Beilstein 6 H 843, 6 III 4250, 6 IV 3303.] .
Dimethyl terephthalate Preparation Products And Raw materials
Dimethyl terephthalate(120-61-6)Related Product Information
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