Terephthalic acid

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

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

Water solubility:

0.002 other: % (w/w)

Temp.:

25 °C

pH:

3.88

Remarks on result:

other: Solubility assumed to have been determined without pH adjustment, pH of saturated aqueous solution therefore expected to correspond to 25 degrees C value given at Point 4.20

Water solubility:

0.033 other: % (w/w)

Temp.:

100 °C

pH:

3.3

Remarks on result:

other: Solubility assumed to have been determined without pH adjustment, pH of saturated aqueous solution therefore expected to correspond to 100 degrees C value given at Point 4.20

Water solubility:

0.07 other: % (w/w)

Temp.:

120 °C

pH:

ca. 3

Remarks on result:

other: Solubility assumed to have been determined without pH adjustment, pH of saturated aqueous solution therefore expected to lie between the 100 and 150 degrees C values given at Point 4.20

Water solubility:

0.37 other: % (w/w)

Temp.:

160 °C

pH:

ca. 2.9

Remarks on result:

other: Solubility assumed to have been determined without pH adjustment, pH of saturated aqueous solution therefore expected to approximate to 150 degrees C value given at Point 4.20

Water solubility:

1.8 other: % (w/w)

Temp.:

200 °C

pH:

2.5

Remarks on result:

other: Solubility assumed to have been determined without pH adjustment, pH of saturated aqueous solution therefore expected to correspond to 200 degrees C value given at Point 4.20

Water solubility:

8.5 other: % (w/w)

Temp.:

240 °C

pH:

2.1

Remarks on result:

other: Solubility assumed to have been determined without pH adjustment, pH of saturated aqueous solution therefore expected to approximate to 250 degrees C value given at Point 4.20

Conclusions:

Interpretation of results: slightly soluble (0.1-100 mg/L)The limit of solubility of terephthalic acid (TPA) in water at 25 degrees C is ca. 17 mg/L. TPA is therefore considered to be slightly soluble in water.

Description of key information

The limit of solubility of terephthalic acid (TPA) in water at 25 degrees C is ca. 17 to 19 mg/L.  TPA is therefore considered to be slightly soluble in water.  

Key value for chemical safety assessment

Water solubility:

17 mg/L

at the temperature of:

25 °C