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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Information contained in an authoritative, standard reference work in industrial chemistry. The authors were employed at the Amoco Chemical Company, with direct access to company data/information relevant to the commercial production of terephthalic acid.
Reason / purpose:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
Procedure not stated
GLP compliance:
not specified
Type of method:
other: procedure not stated
Key result
Sublimation:
yes
Remarks:
at 402 degrees C and atmospheric pressure
Remarks on result:
other: [Ref. Doc. Table 2]
Melting / freezing pt.:
427 °C
Sublimation:
yes
Remarks:
Sublimation point: 404 degrees C
Remarks on result:
other: Melting point determined by the sealed tube method. [Ref. Doc. Table 13]
Conclusions:
Terephthalic acid sublimes at 402 - 404 degrees C at atmospheric pressure. Melting has been observed to occur at 427 degrees C under sealed tube conditions.

Description of key information

Terephthalic acid (TPA) sublimes at 402 - 404 degrees C at atmospheric pressure.  Under normal conditions TPA will therefore undergo direct transition from the solid to the vapour phase without melting.  Melting has been observed to occur at 427 degrees C under sealed tube conditions.

Key value for chemical safety assessment

Additional information