Dimethyl Terephthalate

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  • Dimethyl 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.

  • The other names for DMT are Terephthalic acid methyl ester; Methyl Terephthalate; Dimethyl-p-phthalate;  1,4-Benzenedicarboxylic acid, dimethyl ester; Di-Me terephthalate; Dimethylester kyseliny tereftalove; Methyl 4-carbomethoxybenzoate; Methyl-p-(methoxycarbonyl)benzoate; Dimethyl 4-phthalate; Dimethyl ester of 1,4-Benzenedicarboxylic acid; Dimethyl-1,4-benzenedicarboxylate.

  • 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 methylp-toluate.

  • DMT is used in the production of polyesters, including polyethylene terephthalate (PET) and polytrimethylene terephthalate.

  • It is a building block for an assortment of products from X-ray and video films to polyester fibers and electrical capacitors.

  • DMT is an ideal choice for virtually any industrial plastics application. This compound is used as an intermediate of herbicides and a component of paints, ink and adhesives.

  • Dimethyl terephthalate is recovered from polymer mixtures containing polymers of terephthalic acid & glycol & a chloride polymer, by adding base to neutralize the hydrochloric acid formed by the degradation of the chloride polymer.

  • In order to separate ethylene glycol from dimethyl terephthalate is accomplished by distillation using methyl benzoate or the methyl ester of p-toulic acid as an azeotropic agent.
    Dimethyl terephthalate(DMT) and purified terephthalic acid are feed stocks for the production of polyester.

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