Phosphinic acid, P-[3-(acetyloxy)-3-cyanopropyl]-P-methyl-, butyl ester

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

GLP compliance:

yes (incl. QA statement)

Type of method:

dynamic method

Test material

Test material information

Constituent 1

Reference substance name:

Phosphinic acid, P-[3-(acetyloxy)-3-cyanopropyl]-P-methyl-, butyl ester

EC Number:

605-460-1

Cas Number:

167004-78-6

Molecular formula:

C11 H20 N O4 P

IUPAC Name:

Phosphinic acid, P-[3-(acetyloxy)-3-cyanopropyl]-P-methyl-, butyl ester

Test material form:

liquid: viscous

Results and discussion

Vapour pressure

Vapour pressure 1

Key result

Temp.:

230 °C

Vapour pressure:

1 100 Pa

Remarks on result:

other: measured value

Vapour pressure 2

Key result

Temp.:

50 °C

Vapour pressure:

< 10 Pa

Remarks on result:

other: extrapolated value

Vapour pressure 3

Key result

Temp.:

20 °C

Vapour pressure:

< 1 Pa

Remarks on result:

other: extrapolated value

Vapour pressure at 50°C (if relevant for classification of gas under pressure)

Key result

Vapour pressure:

< 0.1 hPa

Any other information on results incl. tables

Individual Results

Vapour Pressure (Dynamic Method)

The vapour pressure was measured with the dynamic method in the temperature range of 216 °C to 240 °C. The upper temperature was limited because of an observed change of the colour from yellow into brown (thermal decomposition of the test item). The measured vapour pressures at the corresponding temperatures are listed in the following table:

Temperature / °C	Vapour pressure / hPa
215.5	0.6^1)2)
220.2	3.0^1)2)
224.4	6.0^2)
230.1	10.5^3)
234.3	15.4^3)
236.9	19.9^3)
240.0	25.1^3)

1) The data are not included in the graphical representation in Figure 2, as the recommended measuring range is approximately 5 up to 1000 hPa.
2) Determined within a single measurement
3) Determined within three measurements

 

The measured vapour pressure values show a linear dependency within the measured temperature range according to the August equation, which has the mathematical form of the Clausius-Clapeyron equation.

Log10 P = A-(B/T)
with the constants A = 21.46
B = -10287.85

The reliability of a numerical extrapolation for much lower temperatures (20, 25 and 50 °C) is limited due to the limitation of the used equation and the narrow measurable temperature range. Therefore the result of the vapour pressure measurement is given as 11 hPa at 230 °C (rounded values). The estimated vapour pressure at 50 °C is < 10-1 hPa and at 20 °C is < 10-2 hPa.

 

Final Results
Vapour Pressure

The vapour pressure of the test item AE F125869, technical substance, was determined using the dynamic method.
The measured vapour pressure was 1100 Pa at 230 °C.
The estimated vapour pressure values at 20 °C and 50 °C were extrapolated from the experimental data. A numerical extrapolation for these temperatures was not possible due to the limitation of the used equation and the narrow measurable temperature range.

T / °C	p / hPa	p / Pa
230	11	1100
20	< 0.01	< 1
50	< 0.1	< 10