Contact Process - Making Conc. Sulfuric Acid
- Created by: Katy **
- Created on: 19-04-14 16:03
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- Making Conc. Sulfuric acid
- Raw Materials
- sulfur
- air
- water
- H2SO4
- 1st Reaction
- burn sulfur in air
- sulfur dioxide gas
- corrosive
- sulfur dioxide gas
- Sulfur + Oxygen ? Sulfur dioxide
- S + O2 ? SO2
- burn sulfur in air
- 2nd Reaction
- sulfur dioxide is reacted with more air
- sulfur trioxide
- Sulfur dioxide + Oxygen ? Sulfur trioxide
- 2SO2(g) + O2(g) ? 2SO3(g)
- reversible reaction
- Temperature
- increase
- reaction will decrease temperature
- reaction goes backwards
- yield of SO3 decrease
- rate of reaction increase
- cause problems with SO3 yield & rate
- reaction will decrease temperature
- decrease
- reaction will increase temperature
- reaction goes forwards
- yield of SO3 increase
- rate of reaction decrease
- cause problems with SO3 yield & rate
- reaction will increase temperature
- SO3 yield & rate require different temperatures
- moderate temperautre
- 400-500'c
- increase rate
- vanadium (VI) dioxide catalyst
- moderate temperautre
- increase
- Pressure
- increase
- reaction will decrease pressure
- reaction goes forwards
- yield of SO3 increase
- rate of reaction increase
- reaction will decrease pressure
- decrease
- reaction will increase pressure
- reaction goes backwards
- rate of reaction decrease
- yield of SO3 decrease
- reaction will increase pressure
- 1 atmosphere used
- 95% yield of SO3
- high rate
- cost for high pressures not balanced by increase in SO3 yield or rate
- increase
- sulfur dioxide is reacted with more air
- 3rd Reaction
- sulfur trioxide is added into concentrated sulfuric acid
- oleum (mixture)
- oleum is dilluted with water
- conc. H2SO4
- SO3 can't be added to water
- too dangerous
- highly exothermic
- SO3 + H2O ? H2SO4
- sulfur trioxide is added into concentrated sulfuric acid
- act as dehydrating agent
- Vanadium (VI) oxide catalyst
- can be poisoned by impurtites
- stop working
- Raw Materials
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