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Physical & Chemical properties

Vapour pressure

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Endpoint:
vapour pressure
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
Guideline:
other: no data
GLP compliance:
not specified
Type of method:
other: not specified
Temp.:
25 °C
Vapour pressure:
0.14 hPa
Temp.:
52 °C
Vapour pressure:
1.33 hPa
Temp.:
144 °C
Vapour pressure:
133 hPa
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Principles of method if other than guideline:
no data
GLP compliance:
not specified
Temp.:
79 °C
Vapour pressure:
6.7 hPa
Endpoint:
vapour pressure
Type of information:
other:
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Probably values from a literature compilation.
GLP compliance:
not specified

Guaiacol is N°1408.

A=7.32082
B=1786.15
C=196.72

This appears to be valid between 88 and 206°C.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary literature.
GLP compliance:
not specified
Temp.:
89 °C
Vapour pressure:
ca. 13.3 hPa
Temp.:
103 °C
Vapour pressure:
26.7 hPa
Temp.:
118.6 °C
Vapour pressure:
53.3 hPa
Temp.:
128 °C
Vapour pressure:
80 hPa
Temp.:
141.5 °C
Vapour pressure:
133 hPa
Temp.:
161 °C
Vapour pressure:
267 hPa
Temp.:
183 °C
Vapour pressure:
533 hPa
Temp.:
205 °C
Vapour pressure:
1 013 hPa

10 mm Hg was reached at 85.9°C (Stull) or 92°C (Dykyj).

20 mm Hg was reached at 100°C (Stull) or 106°C (Dykyj).

40 mm Hg was reached at 115.6°C (Stull) or 121.6°C (Dykyj).

60 mm Hg was reached at 125.5°C (Stull) or 131°C (Dykyj).

100 mm Hg was reached at 139°C (Stull) or 144°C (Dykyj).

200 mm Hg was reached at 159.1°C (Stull) or 162.7°C (Dykyj).

400 mm Hg was reached at 181.9°C (Stull) or 184.1°C (Dykyj).

760 mm Hg was reached at 205.6°C (Stull) or 205°C (Dykyj).

Endpoint:
vapour pressure
Type of information:
other: secondary source
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary literature.
GLP compliance:
not specified
Temp.:
82 °C
Vapour pressure:
13.33 hPa

This paper compiles a list of chemicals which were found in pulp mill effluents, tabulates their physico-chemical and ecotoxicological  properties, and 

explores the feasibility of establishing broad  structure-property-activity relationships.

A vapor pressure = 1333 Pa at 82°C is cited coming from Boublik et al.  (1973).

Endpoint:
vapour pressure
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary literature and calculation.
Principles of method if other than guideline:
Method: other (calculated)
GLP compliance:
no
Temp.:
25 °C
Vapour pressure:
0.2 hPa

log g-w = 2.115 (experimental : 2.376)

log g-o = -0.276 (experimental : 0.24)

log Ps = 1.317 corresponding to Ps = 20.7 Pa (experimental : 1.387,  corresponding to 24.4 Pa), supposedly at 25°C.

The authors also calculated  Henry's law constant :
log H = -1.31 corresponding to : 0.049 Pa.m3/mol (experimental : -0.89   corresponding to : 0.129 Pa.m3/mol).
Only for this property is the source cited : Sagebiel et al. (1992).

Description of key information

Different studies providing the following values are reported:
0.14 hPa at 25 °C
6.7 hPa at 79 °C
1.33 hPa at 52 °C
ca. 26.7 hPa at 103 °C
ca. 53.3 hPa at 118.6 °C
ca. 80 hPa at 128 °C
ca. 133 hPa at 141.5 °C
ca. 533 hPa at 183 °C
ca. 1013 hPa at 205 °C

Key value for chemical safety assessment

Additional information

The study reporting the value at 25°C has been selected as the key study. As the other values measured at higher temperatures show an increasing Vapour Pressure with temperature, they have been selected as supporting studies.