What is the "contact process" when sulfur dioxide is converetd to sulfur dioxide?
Answer:
Good explanation with diagram at
http://en.wikipedia.org/wiki/contact_pro...
It is called "Nothing Happens"
Sulfur dioxide plus "Nothing Happens" = Sulfur dioxide
You surely wanted to ask sulfer dioxide converted to "something else" - Please resubmit
The contact process is the current method of producing sulfuric acid in the high concentrations needed for industrial processes. Vanadium(V) oxide is the catalyst employed.
The process can be divided into three stages:
Preparation and purification of sulfur dioxide :
Catalytic oxidation (using vanadium oxide catalyst) of sulfur dioxide to sulfur trioxide
Conversion of sulfur trioxide to sulfuric acid
Purification of air and SO2 is necessary to avoid catalyst poisoning (ie. removing catalytic activities). The gas is then washed with water and dried by H2SO4.
To conserve energy, the mixture is heated by exhaust gases from the catalytic converter by heat exchangers.
Sulfur dioxide and oxygen then react in the manner as follows:
2 SO2(g) + O2(g) ⇌ 2 SO3(g) : ΔH = −197 kJ mol−1
To increase the reaction rate, high temperatures (450 °C), high pressures (200 kPa or 2 atm), and vanadium(V) oxide (V2O5) are used to ensure a 99.5% conversion. Platinum would be a more suitable catalyst, but it is very costly and easily poisoned. The catalyst only serves to increase the rate of reaction. The catalyst has no effect on how much SO3 is produced.
Hot sulfur trioxide passes through the heat exchanger and is dissolved in concentrated H2SO4 in the absorption tower to form oleum:
H2SO4(l) + SO3 → H2S2O7(l)
Note that directly dissolving SO3 in water is impractical due to the highly exothermic nature of the reaction. Acidic vapour or mists are formed instead of a liquid.
Oleum is reacted with water to form concentrated H2SO4.
H2S2O7(l) + H2O(l) → 2 H2SO4(l)
sulphur dioxide(dry) is converted 2 sulphur trioxide with excess oxygen under the condition of :
1)the presence of vanadium(V)oxide as catalyst
2)temperature of 450C-550C
3)one atmposhere pressure
2SO2+O2---->2SO3
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