4-chlorobenzonitrile

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1993

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Qualifier:

equivalent or similar to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

GLP compliance:

not specified

Type of method:

other: ebulliometric method

Key result

Test no.:

#1

Temp.:

>= 80.4 °C

Vapour pressure:

>= 6.76 hPa

The measured vapour pressures are presented in table 1.

Table 1: Vapour pressure of 4 -Chlorobenzonitrile.

Temperature [K]	Vapour pressure [kPa]
390.6	3.6
401.1	5.8
411.0	8.4
419.0	11.1
425.6	13.9
431.2	16.8
437.1	20.3
443.2	24.6
449.1	29.4
454.9	34.81
460.5	40.7
466.1	47.6
475.0	60.2
483.4	74.7

The experimental vapour pressures were also correlated by Antoine equations and by Cragoe-Marks equation.

Conclusions:

The vapour pressure of 4 -Chlorobenzonitrile was 6.67 hPa at 80.4 °C and 16 hPa at 98 °C.

Executive summary:

A modified ebulliometer and an apparatus based on comparative ebulliometry have been assembled for vapour-pressure measurement on high-boiling substances with melting temperatures as high as about 400 K. Two very similar ebulliometers essentially of the standard Swietoslawski design were used. The reference ebulliometer was filled with water as a reference fluid of known water pressure and partly enclosed in a Perspex box which shielded the instrument from temperature fluctuations in the surroundings. The measuring ebulliometer was filled with the investigated substance and placed in an air thermostat with transparent front wall. Then the vapour pressure of 4 -Chlorobenzonitrile in the temperature range of 380 - 490 K was determined. The vapour pressure of 4 -Chlorobenzonitrile was 6.67 hPa at 80.4 °C and 16 hPa at 98 °C.

Description of key information

The vapour pressure of 4 -Chlorobenzonitrile was 6.67 hPa at 80.4 °C and

16 hPa at 98 °C.

Key value for chemical safety assessment

Vapour pressure:

6.67 hPa

at the temperature of:

80.4 °C

Additional information

A modified ebulliometer and an apparatus based on comparative ebulliometry have been assembled for vapour-pressure measurement on high-boiling substances with melting temperatures as high as about 400 K. Two very similar ebulliometers essentially of the standard Swietoslawski design were used. The reference ebulliometer was filled with water as a reference fluid of known water pressure and partly enclosed in a Perspex box which shielded the instrument from temperature fluctuations in the surroundings. The measuring ebulliometer was filled with the investigated substance and placed in an air thermostat with transparent front wall. Then the vapour pressure of 4 -Chlorobenzonitrile in the temperature range of 380 - 490 K was determined. The vapour pressure of 4 -Chlorobenzonitrile was 6.67 hPa at 80.4 °C and 16 hPa at 98 °C.