Terephthalic acid

Melting point / freezing point

Link to relevant study record(s)

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 for cross-reference:

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.