Manufacture of Liquid Sulphur Dioxide

Part of the SpringerBriefs in Applied Sciences and Technology book series (BRIEFSAPPLSCIENCES, volume 151)


The conventional method of producing sulphur dioxide is by combustion of sulphur followed by absorption-desorption, drying and cryogenic condensation. This process is capital intensive, hazardous, saddled with corrosion and high utility consumption. \({\text{S}} + {\text{O}}_{ 2} \to {\text{SO}}_{ 2} \quad\Delta {\text{H}} = - 2 9 7 {\text{ KJ}}/{\text{Mol}}\). Molten sulphur at 140 °C is fired in a 8–10 meter long furnace using preheated (80 °C) air. The theoretical temperature achieved by the exit gases exceed 1000 °C. For the production of liquid SO2, high concentrations 16–18 % are necessary. Since the adiabatic temperature in single stage combustion will be high (1600–1800 °C), a two-stage combustion system can be used. It is interesting to note that a highly exothermic nature of sulphur oxidation in a furnace at about 1000 °C can be carried out at reasonably low temperatures 50–110 °C in a pressurised reactor. This is possible by reaction. \({\text{S}}\left( {\text{Liq}} \right) + 2 {\text{ SO}}_{ 3} \left( {\text{Liq}} \right) \to 3 {\text{SO}}_{ 2} \left( {\text{Gas}} \right)\), \(\Delta {\text{H}} = - 74.3 {\text{ KCal}}/{\text{g mole}}\), \(\Delta {\text{F}} = - 3 6. 7 1 {\text{ KCal}}/{\text{g mole}}\). Since the free energy change is large and negative, the reaction is almost instantaneous. In addition, the reaction generates one additional mole in gaseous form. Thus the pressure of the reactor builds up.


Sulphur Dioxide Chlorine Dioxide Sodium Chlorate Liquid Sulphur Acid Mist 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© The Author(s) 2016

Authors and Affiliations

  1. 1.Navdeep Enviro and Technical Services Pvt LtdAmbernathIndia

Personalised recommendations