Chemical Process
Salt is added in the kettle during soap manufacture to separate

Soap from lye
Glycerine from lye
The metallic soap
The unsaponified fat from soap

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

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

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