contact process

Question 1

what is the main stage for contact process

Answer 1

oxidation of sulfur dioxide -> sulfur trioxide
2SO2 + O2 ⇌ 2SO3
-> this process is exothermic

Question 2

catalyst use in contact process

Answer 2

vanadium(V) oxide, V2O5

Question 3

temperature

Answer 3

450 ºC

Question 4

pressure

Answer 4

2 atm

Question 5

why temperature

Answer 5

The forward reaction is exothermic,
-> So increasing the temperature shifts the position of equilibrium to the left in the direction of the reactants
-> the higher the temperature, the lower the yield of sulfur trioxide
-> however, low temperature = low rate of reaction

-> 450 = balance between higher temperature + low equilibrium yield at high temperature

Question 6

why pressure

Answer 6

• High pressures can be dangerous and very expensive equipment is needed
• A higher pressure causes the sulfur dioxide to
  + position of equilibrium lies far to the right

Question 7

what is the first stage

Answer 7

S + O2 -> SO2

Question 8

what is oleum

Answer 8

H2S2O7

Question 9

why SO3 shouldn’t put in water to produce H2SO4

Answer 9

mist of sulfuric acid would be produced
-> difficult to condense
-> highly dangerous

Question 10

equation for creating sulfuric acid

Answer 10

H2O + H2SO7 → 2H2SO4
water + oleum -> sulfuric acid

Question 11

how many stages are there

Answer 11

3 stages

Question 11

how many stages are there

Answer 11

3 stages