Chemical Process
Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.

Sulphite
Neutral sulphite semi-chemical
Sulphate/kraft
Mechanical

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Chemical Process
In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

Removing some quantity of SO₃ during intermediate stage
Increasing the oxygen concentration
Maintaining low temperature & pressure in the converter
Putting more quantity of V₂O₅ catalyst in the converter

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