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Properties - Sulphur Dioxide
November 9, 2001
|
Introduction Physical Properties Vapour Pressure |
Associated Links |
Sulphur dioxide is a clear, colourless gas or liquid. At standard temperature and pressure, it is colourless gas with a sharp pungent odour. Sulphur dioxide gas is twice the density of air. At atmospheric pressure, and at -10°C (14°F), it condenses to form a liquid almost 1½ times the density of water. As the temperature of liquid sulphur dioxide rises, its vapour pressure increases. Liquid sulphur dioxide is not flammable and not explosive but it is intensely irritating to the eyes and respiratory tract. Dry sulphur dioxide is relatively benign to most common metals. However, when even a small amount of moisture is present, sulphur dioxide will react with the moisture to fomr sulphurous acid which will corrode most common metals.
| Colour | Colourless as a gas or liquid |
| Odour | Intense, pungent, irritating |
| Flammability | Not flammable, not explosive in either the gaseous or liquid state |
| Molecular Formula | SO2 |
| Molecular Weight | 64.063 |
| Boiling Point | -10.1°C (14°F) @ 101.3 kPa, 1.0 atmosphere |
| Freezing Point | -75.5°C (-103.9°F) @ 101.3 kPa, 1.0 atmosphere |
| Specific Gravity – Gas | 2.2636 @0°C, 1 atm |
| Critical Temperature | 157.5°C (315.5°F) |
| Critical Pressure | 7883 kPa (1143.3 psia) |
| Critical Volume | 122 cm³/mol |
| Liquid Properties | |
| Specific Gravity | 1.437 @ 0°C (32°F) / Water @ 4°C (39.2°F) |
| Dielectric Constant | 16.5 @ -10.1°C (14°F) |
| Thermal Conductivity | 0.0005715 cal/s cm °C |
| Flammability | Not Flammable |
| deg C | deg F | kPa | psia |
| -40 | -40 | 21.5 | 3.1 |
| -28.9 | -20 | 40.5 | 5.9 |
| -17.8 | 0 | 70.7 | 10.3 |
| -12.2 | 10 | 91.7 | 13.3 |
| -6.7 | 20 | 116.5 | 16.9 |
| -1.1 | 30 | 146.9 | 21.3 |
| 4.4 | 40 | 183.4 | 26.6 |
| 10 | 50 | 226.8 | 32.9 |
| 15.6 | 60 | 277.9 | 40.3 |
| 21.1 | 70 | 338.5 | 49.1 |
| 26.7 | 80 | 408.9 | 59.3 |
| 32.2 | 90 | 489.5 | 71.0 |
| 37.8 | 100 | 579.8 | 84.1 |
| 43.3 | 110 | 683.3 | 99.1 |
| 48.9 | 120 | 801.9 | 116.3 |
| 54.4 | 130 | 936.3 | 135.8 |
| 60.0 | 140 | 1087.3 | 157.7 |
The following Antoine equation adequate correlates the above vapour pressure data.
log10 P = 7.32776 – 1022.80 / (240 + T)
where
T – Temperature (°C)
P – vapour pressure (mm Hg)
