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EC number: - | CAS number: -
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- Oct-Dec 2020
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 021
- Report date:
- 2021
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
Test material
- Reference substance name:
- Low molecular weight organic substances from fast pyrolysis bio-oil
- IUPAC Name:
- Low molecular weight organic substances from fast pyrolysis bio-oil
- Reference substance name:
- Monomers from fast pyrolysis bio-oil
- IUPAC Name:
- Monomers from fast pyrolysis bio-oil
- Reference substance name:
- Dimers from fast pyrolysis bio-oil
- IUPAC Name:
- Dimers from fast pyrolysis bio-oil
- Reference substance name:
- Trimers from fast pyrolysis bio-oil
- IUPAC Name:
- Trimers from fast pyrolysis bio-oil
- Reference substance name:
- Higher oligomers from fast pyrolysis bio-oil
- IUPAC Name:
- Higher oligomers from fast pyrolysis bio-oil
- Reference substance name:
- Water
- EC Number:
- 231-791-2
- EC Name:
- Water
- Cas Number:
- 7732-18-5
- Molecular formula:
- H2O
- IUPAC Name:
- water
- Test material form:
- liquid: viscous
- Remarks:
- Brown /black highly vicous liquid
Constituent 1
Constituent 2
Constituent 3
Constituent 4
Constituent 5
Constituent 6
Results and discussion
Vapour pressureopen allclose all
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.001 Pa
- Remarks on result:
- other: calculated from the regression equation
- Remarks:
- 132 g/mol
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from the regression equation
- Remarks:
- 242 g/mol
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from the regression equation
- Remarks:
- 246 g/mol
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from the regression equation
- Remarks:
- 342 g/mol
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from the regression equation
- Remarks:
- 360 g/mol
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from the regression equation
- Remarks:
- 504 g/mol
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from the regression equation
- Remarks:
- 666 g/mol
Any other information on results incl. tables
As indicated, the vapour pressure was calculated on the basis of the molecular weight of the known constituents. Below you can find the observations made:
| experiment no. | MW 132 g/mol | MW 242 g/mol | MW 246 g/mol | MW 342 g/mol | ||||
| T (K) | mean p | T (K) | mean p | T (K) | mean p | T (K) | mean p | |
| 4 | 348.2 | 1.41E-02 | 348.2 | 1.04E-02 | 348.2 | 1.03E-02 | 348.2 | 8.75E-03 |
| 5 | 363.2 | 3.43E-02 | 363.2 | 2.53E-02 | 363.2 | 2.51E-02 | 363.2 | 2.13E-02 |
| 6 | 378.2 | 5.48E-02 | 378.2 | 4.05E-02 | 378.2 | 4.01E-02 | 378.2 | 3.40E-02 |
experiment no. |
MW 360 g/mol | MW 504 g/mol | MW 510 g/mol | MW 666 g/mol | ||||
| T (K) | mean p | T (K) | mean p | T (K) | mean p | T (K) | mean p | |
| 4 | 348.2 | 8.53E-03 | 348.2 | 7.21E-03 | 348.2 | 7.17E-03 | 348.2 | 6.27E-03 |
| 5 | 363.2 | 2.08E-02 | 363.2 | 1.76E-02 | 363.2 | 1.75E-02 | 363.2 | 1.53E-02 |
| 6 | 378.2 | 3.32E-02 | 378.2 | 2.80E-02 | 378.2 | 2.79E-02 | 378.2 | 2.44E-02 |
On the basis of these results, the vapour pressure at 20°C and 25°C was calculated:
| Vapour pressure (Pa) | MW 132 g/mol | MW 242 g/mol | MW 246 g/mol | MW 342 g/mol | MW 360 g/mol | MW 504 g/mol | MW 510 g/mol | MW 666 g/mol |
| Vapour pressure at 20°C | 5.93E-04 | 4.38E-04 | 4.34E-04 | 3.68E-04 | 3.59E-04 | 3.03E-04 | 3.02E-04 | 2.64E-04 |
| Vapour pressure at 20°C | 8.35E-04 | 6.16E-04 | 6.11E-04 | 5.19E-04 | 5.05E-04 | 4.27E-04 | 4.25E-04 | 3.72E-04 |
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure was examined at 3 different temperatures. The vapour pressure of the known constituents has been determined. The vapour pressure ranges between 2.64 x 10-4 Pa (constituent with highest molecular weight) and 5.93 x 10-4 Pa (constituent with lowest molecular weight) at 20°C.
- Executive summary:
The vapour pressure of the test item BTG Pyrolytic Lignin was determined at three different temperatures (75, 90 and 105 °C) according to OECD 104 resp. EU A.4 using the effusion method (Knudsen cell).
The test item is a complex reaction product consisting of several chemical constituents, and therefore the vapour pressure was calculated based on the molecular mass of a number of known constituents. The vapour pressure ranges between 2.64 x 10-4 Pa (constituent with highest molecular weight) and 5.93 x 10-4 Pa (constituent with lowest molecular weight) at 20°C.
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