Sulfuric Acid Production by DCDA Process
Sulfuric Acid Production by DCDA Process
Step 2: Sulfur Dioxide Conversion
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Before sending sulfur dioxide to the converter, it undergoes pretreatment to remove impurities. First, sulfur dioxide is treated in a washing tower to reduce its temperature, then it is passed through a venturi scrubber to remove fine particles. Subsequently, it is routed to the cooling tower to further lower its temperature and remove water. Afterward, it passes through mist precipitators to eliminate any remaining fine particles and mist.
The conversion of sulfur dioxide and oxygen into sulfur trioxide is highly dependent on the amount of excess oxygen. Therefore, sulfuric acid is diluted with dry air to provide the necessary quantity of air for catalytic reaction. The last treatment step before entering the contact process at the converter is the drying tower, where any remaining water is removed from the sulfur dioxide gas.
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Finally, the purified sulfur dioxide is sent to the converter for the contact process, during which it is converted into sulfur trioxide (SO3) in the presence of a catalyst. Typically, the catalyst used is either vanadium pentoxide (V2O5) or alumina (Al2O3).
2SO2 + O2 2SO3
The equilibrium mentioned above is highly sensitive to temperature and the excess of oxygen. Therefore, controlling the concentrations of SO2 and O2 after treatment process is crucial to establish optimal conditions before the conversion process.
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