Terephthalic Acid
Structural Formula Vector Image
Title: Terephthalic Acid
CAS Registry Number: 100-21-0
CAS Name: 1,4-Benzenedicarboxylic acid
Additional Names: p-phthalic acid
Trademarks: Tephthol
Molecular Formula: C8H6O4
Molecular Weight: 166.13
Percent Composition: C 57.84%, H 3.64%, O 38.52%
Literature References: Prepd by oxidation of p-methylacetophenone: Koelsch, Org. Synth. coll. vol. III, 791 (1955). Manuf processes: US 3014961 (1959 to VEB Chemie Werke Buna); Sherwood, Chem. Ind. (London) 1960, 1096. Review: Faith, Keyes & Clark's Industrial Chemicals, F. A. Lowenheim, M. K. Moran, Eds. (Wiley-Interscience, New York, 4th ed., 1975) pp 807-813; A. G. Bemis et al., "Phthalic Acids" in Kirk-Othmer Encyclopedia of Chemical Technology vol. 17 (Wiley-Interscience, New York, 3rd ed., 1982) pp 732-777.
Properties: Crystals. Sublimes at 402°. Practically insol in water, chloroform, ether, acetic acid; slightly sol in cold alcohol, more in hot alcohol; sol in alkalies.
Derivative Type: Dimethyl ester
Additional Names: Dimethyl terephthalate; DMT
Molecular Formula: C10H10O4
Molecular Weight: 194.18
Percent Composition: C 61.85%, H 5.19%, O 32.96%
Properties: White crystals, mp 140.6°. bp 288°.
Melting point: mp 140.6°
Boiling point: bp 288°
CAUTION: Mild irritant.
Use: Forms polyesters with glycols which are made into plastic films and sheets; in analytical chemistry.

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