Registration Dossier

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Taken from publicly available data, and is considered accurate based on the registrants experience of the substance.
Qualifier:
no guideline available
Principles of method if other than guideline:
Not specified
GLP compliance:
not specified
Type of method:
other: Not specified
Temp.:
20 °C
Vapour pressure:
4 306 Torr
Remarks on result:
other: Equates to 574.086 kPa
Conclusions:
Vapor pressure at 20°C: 4306 torr = 574.086 kPa (Pearson and McConnell, 1975). These references value closely match the registrants experience of the substance and is considered suitable for use, on the basis of a weight of evidence approach.
Executive summary:

Vapor pressure at 20°C: 4306 torr = 574.086 kPa (Pearson and McConnell, 1975). These references value closely match the registrants experience of the substance and is considered suitable for use, on the basis of a weight of evidence approach.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
Not specified.
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 details provided on the method used.
GLP compliance:
not specified
Type of method:
other: Not specified.
Key result
Temp.:
70 °F
Vapour pressure:
84.8 PSI
Remarks on result:
other: equates to 584.68 kPa at 21.11°C
Conclusions:
Vapor pressure at 70°F: 84.8 psia. This equates to 584.68 kPa at 21.11°C. These references value closely match the registrants experience of the substance and is considered suitable for use, on the basis of a weight of evidence approach.
Executive summary:

Vapor pressure at 70°F: 84.8 psia. This equates to 584.68 kPa at 21.11°C. These references value closely match the registrants experience of the substance and is considered suitable for use, on the basis of a weight of evidence approach.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Principles of method if other than guideline:
The measurements were performed with an apparatus which was specially developed for accurate measurements of the saturated-liquid and saturated-vapour densities of pure substances together with the vapour pressure along the whole coexistence curve. Moreover, the apparatus is also suitable for density measurements of the homogeneous gas or liquid phase including the largest part of the critical region. The principle of density measurement is based on a new compensation buoyancy-method using two sinkers instead of the usual single sinker ("Two-Sinker Method"). The essential details of the apparatus were given in a previous paper (Kleinrahm and Wagner, J.Chem. Thermodynamics 1986, 18, 739). Up to now this apparatus has been used for comprehensive measurements of methane and of carbon dioxide.
GLP compliance:
not specified
Type of method:
other: saturated-liquid and saturated-vapour densities
Key result
Temp.:
300 K
Vapour pressure:
683.8 kPa
Remarks on result:
other: The value quoted is an average value of the two pressures presented at 300 K (eq to 26.85°C) of 0.683773 and 0.683824 MPa respectively.

(p,p,T) measurements of dichlorodifluoromethane (R12) in the homogeneous gas and liquid regions, where T is the temperature (IPTS-68), p the pressure, and p the density.

p

p

p

p

p

p

p

p

MPa

Kg m-3

MPa

kg m-3

MPa

kg m-3

MPa

kg m-3

T= 150.000 K

0.521070

1740.14

2.01836

1741.95

4.9402

1745.37

7.93132

1748.84

0.706551

1740.41

2.09491

1742.01

5.38984

1745.91

 

 

1.46669

1741.30

4.89954

1745.31

7.85308

1748.71

 

 

T= 200.000 K

0.105606

1608.12

1.35691

1610.43

5.01437

1617.05

 

 

0.683103

1609.19

2.00173

1611.64

7.61158

1621.62

 

 

0.691904

1609.21

4.02274

1615.28

7.82172

1621.93

 

 

T= 250.000 K

0.1968867

1467.69

0.623629

1469.07

2.00453

1473.34

5.98339

1485.05

0.214425

1467.7

1.20441

1470.88

5.03220

1482.32

7.95081

1490.57

0.568089

1468.87

1.54731

1471.92

5.06294

1482.41

8.00105

1490.69

0.627396

1469.05

1.99882

1473.33

5.11701

1482.58

 

 

T= 260.000 K

0.088605

5.0877

0.188940

11.2128

0.193126

11.4777

 

 

0.088914

5.1057

0.190701

11.3243

0.193679

11.5129

 

 

0.171486

10.1157

0.191630

11.3830

0.194166

11.5436

 

 

T= 300.000 K

0.196023

9.8656

0.625871

34.8378

0.882549

1305.66

2.02310

1312.74

0.196579

9.8955

0.653242

36.6409

0.989723

1306.27

2.07618

1313.05

0.197690

9.9534

0.660564

37.1292

1.28087

1308.08

3.53347

1321.65

0.378700

19.8197

0.669299

37.7131

1.28596

1308.14

4.85560

1329.00

0.386229

20.2483

0.670567

37.7989

1.28943

1308.16

5.01835

1329.86

0.486436

26.1127

0.678337

38.3227

1.46784

1309.31

6.53294

1337.77

0.545300

29.7091

0.709733

1304.46

1.50036

1309.49

7.92885

1344.66

0.589405

32.4849

0.882592

1305.56

1.53267

1309.70

8.03605

1345.17

T= 330.000 K

0.203561

9.2284

0.933834

47.9897

1.36495

77.9373

1.39835

80.6397

0.440353

20.6947

1.18146

64.2157

1.38693

79.7066

1.40849

81.4790

0.616964

29.8591

1.33082

75.2468

1.39194

80.1143

 

 

 

Experimental results for the vapour pressurepō, the saturated-liquid density p’, and the saturated-vapour density p”,of dichlorodifluoromethane (R12), whereTis the temperature (IPTS-68)

T

p”

pō

p’

pō

T

p”

pō

p’

pō

K

kg m-3

MPa

kg m-3

MPa

K

kg m-3

MPa

kg m-3

MPa

120.000

 

 

1818.42

 

260.000

 

 

1437.30

0.195368

120.000

 

 

1818.45

 

260.000

 

 

 

0.195369

130.000

 

 

1791.93

 

270.000

 

0.277449

 

 

140.000

 

 

1765.68

 

270.000

 

 

1406.09

0.277562

150.000

 

 

1739.56

 

270.000

 

 

 

0.277658

160.000

 

 

1713.47

 

280.000

 

0.383596

 

 

160.000

 

 

1713.52

 

280.000

 

0.383626

 

 

170.000

 

 

1687.35

 

280.000

 

 

1373.68

0.383694

180.000

 

0.002248

1661.07

 

280.000

 

 

 

0.383845

180.000

 

 

 

0.002218

290.000

 

0.517561

 

 

190.000

 

 

1634.64

0.004922

290.000

 

0.517628

 

 

200.000

 

 

1607.96

0.010008

290.000

 

 

 

0.517586

210.000

 

 

1580.89

0.018854

290.000

 

 

 

0.517647

220.000

 

 

1553.43

0.033180

290.000

 

 

 

0.517653

220.000

 

 

1553.44

 

290.000

 

 

1339.84

0.517786

220.000

 

 

1553.46

 

290.000

 

 

 

0.517925

230.000

 

 

1525.45

0.055227

300.000

38.6912

0.683773

 

 

240.000

 

 

1496.84

0.087569

300.000

 

0.683824

 

 

240.000

 

 

 

0.087583

300.000

 

 

1304.29

0.683880

245.000

 

 

 

0.108536

300.000

 

 

 

0.684095

245.000

 

 

 

0.108546

300.000

 

 

1304.29

 

250.000

 

 

1467.54

 

310.000

 

 

1266.64

0.886405

250.000

 

 

1467.55

 

310.000

 

0.886481

 

 

255.000

 

 

 

0.161984

320.000

 

 

1226.38

1.12996

255.000

 

 

 

0.161993

320.000

 

1.13019

 

 

255.000

 

 

 

0.161993

320.000

 

 

1226.33

 

260.000

 

0.195187

 

 

320.000

 

 

1226.36

1.13070

260.000

 

0.195221

 

 

330.000

 

 

1182.77

1.41971

260.000

11.6130

0.195259

 

 

330.000

82.4281

1.41994

 

 

260.000

 

 

1437.34

0.194168

340.000

 

 

1134.75

 

260.000

 

 

 

0.195353

 

 

 

 

 

 

Conclusions:
The study focuses on the pressure, density, temperature) relations of dichlorodifluoromethane (R12) and of chlorodifluoromethane (R22) in parts of the homogeneous gas and liquid regions and on the coexistence curve of the substance.

The study details vapour pressures over a wide range of temperatures for the substance. The value quoted in this summary is an average value of the two pressures presented at 300 K of 0.683773 and 0.683824 MPa respectively. These values match with other data available and is considered appropriate for use on the basis of a weight of evidence approach.
Executive summary:

The study focuses on the pressure, density, temperature) relations of dichlorodifluoromethane (R12) and of chlorodifluoromethane (R22) in parts of the homogeneous gas and liquid regions and on the coexistence curve of the substance.

The study details vapour pressures over a wide range of temperatures for the substance. The value quoted in this summary is an average value of the two pressures presented at 300 K (i.e., 26.85°C) of 0.683773 and 0.683824 MPa respectively. These values match with other data available and is considered appropriate for use on the basis of a weight of evidence approach.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
Not applicable
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Principles of method if other than guideline:
The static equilibrium apparatus and the procedures used for this work are described by Kang and Lee (1996). The equilibrium temperature was measured with a T-type thermocouple converter (Yokogawa Elec. Corp., model STED-210-TT*B) having an accuracy of +/- 0.1 °C. The equilibrium pressure was determined by a gauge pressure transmitter (Yokogawa Elec. Corp., model UNE43-SAS3*B) and a barometer having accuracies of +/- 0.5 kPa and +/- 0.05 kPa, respectively.
The mass of each component introduced into the cell was determined with a digital balance having an accuracy of +/-0.01 g. The compositions of the vapor phase were not measured. The compositions of the liquid phase were calculated from the total composition by correction for the mass of each component existing in the vapor phase. The densities of the both phases were estimated by using the Peng-Robinson equation of state (1976) with the binary interaction parameters obtained by data reduction of the experimental data. Factors affecting the accuracy of the liquid-phase mole fractions would be the accuracy of the masses of each component introduced into the cell and the estimated densities of both phases. The effect of 10% errors in the estimated densities for the liquid and the vapor phase gives an error of approximately 0.0001 and 0.0005 in the respective mole fraction. The estimated accuracy of the liquid-phase composition was +/- 0.001.
GLP compliance:
not specified
Type of method:
other: Isothermal vapor-liquid equilibria
Temp.:
-30 °C
Vapour pressure:
4 129 kPa

Vapour-Liquid Equilibria for CFC-12 (1) + Chlorine (2) at 10.0°C

P/kPa

x1

y1(calcd)

P/kPa

x1

y1(calcd)

502.1

0.0000

0.0000

518.3

0.4495

0.4072

511.2

0.0484

0.0630

513.4

0.5004

0.4486

517.9

0.1000

0.1190

508.0

0.5487

0.4894

521.9

0.1520

0.1683

501.7

0.5988

0.5335

524.4

0.1995

0.2094

494.7

0.6487

0.5795

523.3

0.2503

0.2509

485.9

0.6995

0.6290

525.0

0.3013

0.2911

477.1

0.7517

0.6831

523.8

0.3497

0.3287

467.9

0.7995

0.7357

521.6

0.3997

0.3677

457.0

0.8504

0.7956

518.3

0.4502

0.4078

447.0

0.8952

0.8521

514.0

0.4993

0.4477

435.3

0.9501

0.9265

 

 

 

422.6

1.0000

1.0000

Binary Parameters of the Peng-Robinson Equation of State and Standard Deviations of the Measured Variables for the Binary Systems

System

t/°C

012

Standard deviations

P/kPa

t/°C

100x1

CFC-12 (1) + Chlorine (2)

10.0

0.0075

0.2

0.02

0.00

Conclusions:
The study focuses on the Isothermal Vapor-Liquid Equilibria of the substance. However, the vapour pressure is reported for the pure substance at -30 deg C as 4129 kPa. This is the approximate boiling point of the substance and is considered to be just above the saturation temperature.
Executive summary:

The study focuses on the Isothermal Vapor-Liquid Equilibria of the substance. However, the vapour pressure is reported for the pure substance at -30 deg C as 4129 kPa. This is the approximate boiling point of the substance and is considered to be just above the saturation temperature.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
Not specified
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 method specified.
GLP compliance:
not specified
Type of method:
other: No method specified.
Key result
Temp.:
30 °C
Vapour pressure:
7.6 atm
Remarks on result:
other: Equates to 770.1 kPa.
Key result
Temp.:
20 °C
Vapour pressure:
4 250 mm Hg
Remarks on result:
other: Equates to 566.6 kPa.
Conclusions:
Two values are presented, as follows:

Equates to 770.1 kPa. 30°C
Equates to 566.6 kPa. 20°C

These references value closely match the registrants experience of the substance and is considered suitable for use, on the basis of a weight of evidence approach.
Executive summary:

Two values are presented, as follows:

Equates to 770.1 kPa. 30°C

Equates to 566.6 kPa. 20°C

These references value closely match the registrants experience of the substance and is considered suitable for use, on the basis of a weight of evidence approach.

Description of key information

Vapour pressure: 566.6 kPa at 20°C

Key value for chemical safety assessment

Vapour pressure:
566.6 kPa
at the temperature of:
20 °C

Additional information

Five references are available for review. The reference values closely matches the registrants experience of the substance and is considered suitable for use, on the basis of a weight of evidence approach. The value at 20 deg C is chosen as the most appropriate one for use in the assessment process, as this closely matches values obtained from the other studies.