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EC number: 210-784-8 | CAS number: 623-27-8
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: isothermal thermogravimetry
Test material
- Reference substance name:
- Terephthalaldehyde
- EC Number:
- 210-784-8
- EC Name:
- Terephthalaldehyde
- Cas Number:
- 623-27-8
- Molecular formula:
- C8H6O2
- IUPAC Name:
- benzene-1,4-dicarbaldehyde
- Test material form:
- solid: particulate/powder
Constituent 1
- Specific details on test material used for the study:
- Batch (Lot) Number: 180401
Expiry date: 01 April 2020 (retest date)
Physical Description: Light yellow powder
Purity/Composition: 99.6%
Storage Conditions: At room temperature
Results and discussion
Vapour pressureopen allclose all
- Key result
- Test no.:
- #1
- Temp.:
- ca. 20 °C
- Vapour pressure:
- ca. 0.25 Pa
- Test no.:
- #2
- Temp.:
- ca. 25 °C
- Vapour pressure:
- ca. 0.46 Pa
Any other information on results incl. tables
The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°Cand 25°Care given inTable 2andTable 3.
The vapour pressure regression curve of the log PTof the test item as function of the reciprocal temperatures is shown inFigure 9. The equation of the curve was: log PT= -4630´1/T + 15.19 (r = 0.994, n = 6).
Table 2
Results of the Vapour pressure Isothermal TGA Analysis
Temperature |
Weight loss |
νT |
logνT |
logPT |
PT |
70 |
15.8067 |
1.89 x 10-3 |
-2.72 |
1.65 |
4.5 x 101 |
|
19.0981 |
2.28 x 10-3 |
-2.64 |
1.76 |
5.7 x 101 |
80 |
34.1986 |
4.08 x 10-3 |
-2.39 |
2.08 |
1.2 x 102 |
|
32.5007 |
3.88 x 10-3 |
-2.41 |
2.05 |
1.1 x 102 |
90 |
68.5095 |
8.18 x 10-3 |
-2.09 |
2.47 |
2.9 x 102 |
|
63.9258 |
7.63 x 10-3 |
-2.12 |
2.43 |
2.7 x 102 |
Table 3
Vapour Pressure of the Test Item
Temperature |
logPT |
PT |
PT |
20 |
-0.61 |
0.25 |
1.9x10-3 |
25 |
-0.34 |
0.46 |
3.4x10-3 |
Applicant's summary and conclusion
- Conclusions:
- The isothermal TGA effusion method was applied for the determination of the vapour pressure of Terephthaldehyde.
The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was 0.25 Pa and 0.46 Pa respectively (1.9 x10^-3 and 3.4 x 10 ^-3 mmHg )
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