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terephthalic acid

Product name terephthalic acid
Synonyms 1,4-benzenedicarboxylic acid
GOST no data
CAS 100-21-0

Terephthalic acid - is one isomer of the three phthalic acids; colorless crystalline substance. Almost insoluble in water, alcohols. It sublimes without melting when heated. Being treated with alcohols gives esters.

Production.

  • On an industrial scale, terephthalic acid is produced by oxidation of p-xylene by oxygen from air. This is done using acetic acid as solvent, in the presence of a catalyst such as cobalt-manganese, using a bromide promoter (175-230 °C, 1.5-3.0 MPa, 0.5-3h, 95% yeild). Technical terephthalic acid from this process is purified from 4-formyl benzoic acid by hydrogenation at high temperature and pressure.
  • p-xylene oxidation by diluted H2SO4 in acetic acid in presence of Cr2O3.
  • via the Henkel process, which involves the rearrangement of phthalic acid to terephthalic acid via the corresponding potassium salts.

    Uses.

    Terephthalic acid is used as a monomer component in the production of polymers, principally polyethylene terephthalate (polyester or PET) and polybutylene terephthalate (PBT).

  • Manufacturer(s) OJSC Polief
    Chemical structure of terephthalic acid

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