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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Sulphuric Acid on the Web

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Properties - Sulphur Dioxide
November 9, 2001

Introduction
Physical Properties
Vapour Pressure
Associated Links

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

Vapour Pressure

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)