Chemical Process
The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

None of these
Remove lignin by way of crystallisation
Avoid mechanical weakening of fibre
Increase the cellulose content

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Chemical Process
In the manufacture of H₂SO₄, vanadium catalyst as compared to platinum catalyst

All of these
Gives higher conversion efficiency
Has a longer life and is not poisoned by arsenic
Handles lower SO₂ content gas (7 -10% SO₂), thus increasing the capital cost of the plant

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