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Properties - Sulphur Dioxide
November 9, 2001
Introduction
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.
Physical Properties
| 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)
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