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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2013-03-25 to 2013-03-26
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed, 2011-04-11
Type of method:
method according to Siwoloboff
Boiling pt.:
317 °C
Atm. press.:
99 094 Pa
Decomposition:
yes
Decomp. temp.:
317 °C
Remarks on result:
other: first measurement
Boiling pt.:
318 °C
Atm. press.:
99 136 Pa
Decomposition:
yes
Decomp. temp.:
318 °C
Remarks on result:
other: third measurement
Key result
Boiling pt.:
317.5 °C
Atm. press.:
>= 99 094 - <= 99 136 Pa
Decomposition:
yes
Decomp. temp.:
317.5 °C
Remarks on result:
other: mean of two measurements

Results

The following observations were made:

Observations

Determination

Boiling Point

Atmospheric Pressure

First determination

317.0 °C (590.2 K)

99094 Pa

Second determination

325.0 °C (598.2 K)

99077Pa

Third determination

318.0 °C (591.2 K)

99136 Pa

 

For the calculation of the value of the mean and the evaluation, the result of the second determination was discarded because the deviation between the first two determinations was too high and the third experiment confirmed the result of first determination.


 Observations

First

determination

Second

determination

Third

determination

210°C: A few bubbles rose on the boiling capillary, but not a constant chain of bubbles. The test item became slightly darker.

210°C: A few bubbles rose on the boiling capillary, but not a constant chain of bubbles. The test item became slightly darker.

210°C: A few bubbles rose on the boiling capillary, but not a constant chain of bubbles. The test item became slightly darker.

240°C: White vapours were observed.

245°C: White vapours were observed.

240°C: White vapours were observed.

250°C: No more bubbles rose (constantly) on the boiling capillary and the test item became clearly darker.

250°C: No more bubbles rose (constantly) on the boiling capillary and the test item became clearly darker.

250°C: No more bubbles rose (constantly) on the boiling capillary and the test item became clearly darker.

325°C: Bubbles rose permanent on the boiling capillary, but not a constant chain of bubbles.

340°C: Bubbles rose permanent on the boiling capillary, but not a constant chain of bubbles.

330°C: Bubbles rose permanent on the boiling capillary, but not a constant chain of bubbles.

390°C: A chain of bubbles rose on the boiling capillary andheating was turned down to cool down slowly.

395°C: A chain of bubbles rose on the boiling capillary andheating was turned down to cool down slowly.

388°C: A chain of bubbles rose on the boiling capillary andheating was turned down to cool down slowly.

317°C: Thechain of bubbles broke and the test item filled the lower part of the capillary.

325°C: Thechain of bubbles broke and the test item filled the lower part of the capillary.

318°C: Thechain of bubbles broke and the test item filled the lower part of the capillary.

After cooling down, the test item hadchanged its colour to reddish amber with a black residue at the surface.The test item was more viscous after the test.

After cooling down, the test item hadchanged its colour to reddish amber with a black residue at the surface.The test item was more viscous after the test.

After cooling down, the test item hadchanged its colour to reddish amber with a black residue at the surface.The test item was more viscous after the test.

 

Evaluation

A pressure correction following Sidney-Young was not applied as the test item decomposes. The boiling point was stated as 317.5 °C (590.7 K) under decomposition, which is the mean of the two determinations.

Conclusions:
The boiling point of the test item VP 112/18 was determined with 317.5 °C (590.7 K) under decomposition.
The test item became more viscous and had changed its colour to reddish amber with a black residue at the surface after the test which was a clear sign of decomposition.

Description of key information

The boiling point of naphthenic acids, zinc salts, basic was determined with 317.5 °C (590.7 K) under decomposition between 99094hPa and 99136hPa.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
317.5 °C

Additional information

Naphthenic acids, zinc salts, basic became more viscous and had changed its colour to reddish amber with a black residue at the surface after the test which was a clear sign of decomposition.