The Contact Process Flashcards

1
Q

What is the purpose of the contact process

A

To make sulphuric acid

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2
Q

5 uses of sulphuric acid

A
  1. Used as an industrial acid
  2. Lead acid batteries in cars
  3. Waste water purification
  4. Fertiliser (ammonium sulphate)
  5. Refining ores
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2
Q

Step 1 of the contact process method 1

A

Burn sulphur in excess air

S + O2 –> SO2

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3
Q

Simple 3 step process for contact process

A
  1. Produce sulphur dioxide (2 methods)
  2. Convert sulphur dioxide to subdue trioxide (reversible reaction)
  3. Convert sulphur trioxide into sulphuric acid
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4
Q

Step 1 of the contact process method 2

A

Heat sulfides in excess air

4FeS2 + 11O2 –> 2Fe2O3 + 8SO2

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5
Q

Step 2 of the contact process

A

Making sulphur dioxide dugout trioxide

2SO2 + O2 2SO3

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6
Q

Conditions for step 2 of the contact process

A
Temperature = 400-450
Pressure= 1-2 atmospheres 
Catalyst= vanadium oxide
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7
Q

Step 3 of the contact process

A
Turn sulphur trioxide to sulphuric acid 
to make oleum 
SO3 + H2SO4 --> H2S2O7 
Dissolve oleum in water 
H2S2O7 + H2O --> 2H2SO4
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8
Q

Step 3 of contact process equation(s)

A

SO3 + H2SO4 –> H2S2O7

H2S2O7 + H2O –> 2H2SO4

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9
Q

Step 2 of the contact process equation(s)

A

2SO2 + O2 2SO3

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10
Q

Step 1 of the contact process method 2 equation(s)

A

4FeS2 + 11O2 –> 2Fe2O3 + 8SO2

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11
Q

Step 1 of the contact process method 1 equation(s)

A

S + O2 –> SO2

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12
Q

Why is sulphuric trioxide not dissolved in water

A

Steamy fumes of sulphuric acid are produced with is dangerous and lowers the yield

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