Trifluoromethanesulphonic anhydride

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

No specific testing date available.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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

Type of method:

static method

Key result

Temp.:

20 °C

Vapour pressure:

70.93 hPa

Remarks on result:

other: 70.93 mbar +/- 0.54 mbar.

Key result

Temp.:

25 °C

Vapour pressure:

93.18 hPa

Remarks on result:

other: 93.18 mbar +/- 0.54 mbar.

The results presented in the following Figure 1 were obtained from the raw data reported in Table 1. The measured data is self-consistent, as shown by the coefficient of determination: R²=0.9998.

Definition of terms: Texp = Experimental temperature (°C)

Pexp = Experimental pressure (mbar)

Table 1: Data recorded during the experiment

Texp	Pexp	1/Texp	ln(Pexp)
[°C]	[mbar]	[K-1]	withPexpinmbar
5.55	29.38	0.00359	3.380
5.60	29.47	0.00359	3.383
5.61	29.55	0.00359	3.386
10.45	40.05	0.00353	3.690
10.43	39.98	0.00353	3.688
10.41	40.03	0.00353	3.690
20.29	71.95	0.00341	4.307
20.26	71.98	0.00341	4.307
20.29	71.89	0.00341	4.306
30.01	122.04	0.00330	4.822
30.00	121.88	0.00330	4.821
30.00	121.95	0.00330	4.822
39.69	196.51	0.00320	5.281
39.71	196.51	0.00320	5.281
39.74	196.45	0.00320	5.280
49.15	302.540	0.00310	5.704
49.16	302.604	0.00310	5.704
49.13	302.584	0.00310	5.704

The uncertainty of measurement for pressure was about 0.4 mbar and for temperature, it was about 0.05 °C

The measured vapour pressures were used to regress the coefficients of Antoine's law reported in Table 2 using the following equation. They enable to calculate the vapour pressure of the test item at any given temperature provided this temperature falls within the range specified in the same table. Ln P = A + (B/(T + C))

With Pcal (calculated pressure) in mbar and T in K

Table 2: Antoine's law coefficients

A	B	C
18.04779	-3413.43701	-45.55132

The maximum error involved by the modelling of vapour pressure with our Antoine’s law is about 0.8 mbar which is in magnitude of the uncertainty of measurement of pressure.

Table 3: Average of measured values and calculated data with Antoine’s law coefficients

Texp	Pexp	Pcalc	Pexp-Pcalc
[°C]	[mbar]	[mbar]	[mbar]
5.59	29.47	30.25	0.78
10.43	40.02	40.75	0.72
20.28	71.94	72.04	0.10
30.00	121.95	121.15	0.80
39.72	196.49	196.06	0.43
49.15	302.58	302.97	0.40

Conclusions:

The vapour pressure of the test item at 20 °C is 70.93 mbar +/- 0.54 mbar.
The vapour pressure of the test item at 25 °C is 93.18 mbar +/- 0.54 mbar.

Executive summary:

In a study (2016), the vapour pressure of trifluoromethanesulfonic anhydride was determined using a static cell, according to the OECD 104 and EU A.4 guidelines. Measurements were performed at temperatures from 5 °C up to 49 °C. For each temperature, once the temperature and pressure inside the cell were stable, three readings were made, spaced by not less than 5 minutes. Using the Antoine’s law, the vapour pressure was calculated at 20 and 25°C as follows :

The vapour pressure at 20°C was 70.93 mbar +/- 0.54 mbar.

The vapour pressure at 25°C was 93.18 mbar +/- 0.54 mbar.

Description of key information

One reliable key study scored as reliability 1 is available for this endpoint. The vapour pressure of trifluoromethanesulfonic anhydride was determined using a static cell, according to the OECD 104 and EU A.4 guidelines. The vapour pressure at 20°C was 70.93 mbar +/- 0.54 mbar. The vapour pressure at 25°C was 93.18 mbar +/- 0.54 mbar.

Key value for chemical safety assessment

Vapour pressure:

70.93 hPa

at the temperature of:

20 °C