Hydrocarbons, C3-4

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP status not known, guideline not known, information from a published handbook, acceptable with restrictions

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Type of method:

other: method not reported

Temp.:

16.85 °C

Vapour pressure:

217 kPa

Key result

Temp.:

21.85 °C

Vapour pressure:

255 kPa

Conclusions:

The vapour pressure of buta-1,3-diene is 255 kPa at 21.85ºC.

Executive summary:

No information on the test methods used is available in the publication. However, this information is taken from a peer reviewed handbook and so can be considered reliable and suitable for use as the key study for this endpoint. The vapour pressure of buta-1,3-diene is 255 kPa at 21.85ºC.

Reference 2

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP; non-guideline; Information from published handbook, data compendium, review article or other reference text; acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

not known

Type of method:

other: Not known

Temp.:

-7.3 °C

Vapour pressure:

100 kPa

Key result

Temp.:

25 °C

Vapour pressure:

1 160 kPa

Remarks on result:

other: Extrapolated from reported result at lower temperature

Extrapolated using EUSES v 2.1.2

Conclusions:

The vapour pressure of 2-methylpropene was determined to be 1160 kPa at 25°C. The endpoint value was extrapolated from a result at a lower temperature.

Executive summary:

No information on the methods used is available. However, this information is taken from a reliable peer reviewed handbook and is considered reliable and suitable for use for this endpoint. The vapour pressure of 2 -methylpropene was determined to be 1160 kPa at 25°C. The endpoint value was extrapolated from a results at a lower temperature.

Reference 3

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP, non-guideline, Information from published handbook, acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

No data reported

Type of method:

other: No data reported

Temp.:

-12 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

1 750 kPa

Remarks on result:

other: Calculated for standard temperature from 100 kPa at -12°C

Key result

Temp.:

21.85 °C

Vapour pressure:

319 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Temp.:

26.85 °C

Vapour pressure:

370 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Conclusions:

The vapour pressure of isobutane is 319 kPa at 22°C.

Executive summary:

The vapour pressure of isobutane is 319 kPa at 22°C. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

Reference 4

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP, non-guideline, Information from published handbook, acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

No data reported

Type of method:

other: No data reported

Temp.:

-0.8 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

677 kPa

Remarks on result:

other: Calculated for standard temperature from 100 kPa at -0.8°C

Key result

Temp.:

21.85 °C

Vapour pressure:

221 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Temp.:

26.85 °C

Vapour pressure:

258 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Conclusions:

The vapour pressure of butane is 221 kPa at 22°C.

Executive summary:

The vapour pressure of butane is 221 kPa at 22°C. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

Reference 5

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP; non-guideline; Information from published handbook, data compendium, review article or other reference text; acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

not known

Type of method:

other: Not known

Key result

Temp.:

25 °C

Vapour pressure:

1 100 kPa

Remarks on result:

other: But-1-ene: Extrapolated from reported result at lower temperature

Key result

Temp.:

25 °C

Vapour pressure:

>= 484 - <= 605 kPa

Remarks on result:

other: 2-butene: Extrapolated from reported result at lower temperature

Temp.:

-6.6 °C

Vapour pressure:

100 kPa

Remarks on result:

other: But-1-ene

Temp.:

3.4 °C

Vapour pressure:

100 kPa

Remarks on result:

other: cis-2-butene

Temp.:

0.6 °C

Vapour pressure:

100 kPa

Remarks on result:

other: trans-2-butene

Extrapolated using EUSES v 2.1.2

Conclusions:

The vapour pressure of butene was determined to be 484 -1100 kPa at 25°C. The endpoint value was extrapolated from lower temperatures results for but-1-ene and but-2-ene.

Executive summary:

No information on the methods used is available. However, this information is taken from a reliable peer reviewed handbook and is considered reliable and suitable for use for this endpoint. The vapour pressure of butene was determined to be 484 -1100 kPa at 25°C. The endpoint value was extrapolated from lower temperature results for but-1 -ene and but-2 -ene.

Reference 6

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP status not known, guideline not known, information from a published handbook, acceptable with restrictions

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Type of method:

other: Method not known

Temp.:

-88.8 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

26 000 000 kPa

Remarks on result:

other: Calculated to standard temperature from 100 kP at -88.8°C

Key result

Temp.:

21.85 °C

Vapour pressure:

3 917 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Temp.:

26.85 °C

Vapour pressure:

4 355 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Conclusions:

The vapour pressure of ethane is 3917 kPa at 22°C.

Executive summary:

No information on the primary source of the data or the methods used is available. However, this information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint. Most up to date source at the time. The vapour pressure of ethane is 3917 kPa at 22ºC.

Reference 7

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP status not known, information from a published handbook, acceptable with restrictions

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the Handbook of Vapor Pressures and Heats of Vapourization of Hydrocarbons and Related Compounds states that data included has been collected, calculated, critically selected and compiled. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

No data reported

Type of method:

other: No data reported

Key result

Temp.:

-90 °C

Vapour pressure:

212.4 kPa

Remarks on result:

other: No further details provided

Conclusions:

The vapour pressure of ethylene is 212 4hPa at -90˚C.

Executive summary:

The vapour pressure of ethylene is 2124 hPa at -90˚C. No information on the methods used is available. However, this information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use as the key study for this endpoint.

Reference 8

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP, non-guideline, Information from published handbook, acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Type of method:

other: No data reported

Temp.:

-161.7 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

50 400 000 000 000 000 kPa

Remarks on result:

other: Calculated for standard temperature from 100 kPa at -161.7°C: 5.04E+19 Pa

Temp.:

-83.15 °C

Vapour pressure:

4 520 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K.

Key result

Temp.:

25 °C

Vapour pressure:

445 000 000 kPa

Remarks on result:

other: Calculated for standard temperature from 4520 kPa at -83.15°C: 4.45 E+11 Pa

Conclusions:

The vapour pressure of methane is 4.45 E+8 kPa at 25˚C.

Executive summary:

The vapour pressure of methane is 4.45 E+8 kPa at 25˚C. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

Reference 9

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non-GLP, non-guideline, Information from published handbook, acceptable with restrictions.

Principles of method if other than guideline:

The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.

GLP compliance:

not specified

Remarks:

No data reported

Type of method:

other: No data reported

Temp.:

-42.3 °C

Vapour pressure:

100 kPa

Temp.:

25 °C

Vapour pressure:

36 000 kPa

Remarks on result:

other: Calculated for standard temperature from 100 kPa at -42.3°C

Key result

Temp.:

21.85 °C

Vapour pressure:

878 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Temp.:

26.85 °C

Vapour pressure:

998 kPa

Remarks on result:

other: Vapour pressure of fluids at temperatures below 300 K

Conclusions:

The vapour pressure of propane is 878 kPa at 22°C.

Executive summary:

The vapour pressure of propane is 878 kPa at 22°C. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint.

Reference 10

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study was conducted to standard guideline, major restrictions in reporting but otherwise considered reliable for assessment

Qualifier:

according to guideline

Guideline:

other: ASTM D-323

GLP compliance:

not specified

Type of method:

other: Reid Method

Temp.:

20 °C

Vapour pressure:

59.89 PSI

Conclusions:

The vapour pressure of 95465-89-7 is reported as 59.89 PSI.

Executive summary:

The study was conducted according to a standard guideline and is considered suitable for assessment. The vapour pressure of 95465-89-7 is 59.89 PSI.

Description of key information

The vapour pressure of the substances in the category ranges from 143 kPa to 3917 kPa at 20 to 25ºC, with methane presenting a vaopur pressure of 4.45E+8 kPa at 25°C, which is 5-6 orders of magnitude higher than the rest.

Key value for chemical safety assessment

Vapour pressure:

872 kPa

at the temperature of:

22 °C

Additional information

Data are available for 95465-89-7 from a proprietary study conducted according to standard guidelines (Repsol 2009). The vapour pressure of 95465-89-7 is 143 kPa at 20°C.

Data from the CRC handbook (Lide 2008) were available for the substances methane, ethane, propane, 2-methylpropane (isobutane), 2-methylpropene, butane, butene and 1,3-butadiene. The information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use for this endpoint. Data for ethylene was taken from handbook by Zwolinski and Wilhoit (1971), which is peer reviewed and is considered reliable and suitable for use as the key study for this endpoint. Vapour pressure values of constituents at 20-25ºC have been extrapolated from results at lower temperatures. The vapour pressure of methane is 4.45 E+8 kPa at 25˚C, ethane is 3917 kPa at 22˚C, ethylene is 212.4 kPa at -90˚C, propane is 878 kPa at 22°C, 2-methylpropane is 319 kPa at 22°C, 2 -methylpropene is 1160 kPa, butane is 221 kPa at 22°C butene is 484 - 1100 kPa at 25ºC, and 1,3 -butadiene is 255 kPa at 22ºC.

The data available for these substances can be read across to other members of the category. The mean of the vapour pressure values for the category is 872 kPa at 22°C (excluding methane of the mean for having a value of orders of magnitude higher than the rest) and this has been used to complete the 'key value for chemical safety assessment'. This value may change for streams that do not contain 1,3 -butadiene.