Chemical Process
Mannheim furnace is used in the manufacture of

Corundum
Hydrochloric acid
Calcium carbide
H₂SO₄ by Chamber process

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Chemical Process
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

Always contain some amount of nickel (as their complete removal is very difficult)
Cause cholesterol build up and blood clotting
Are prone to rancid oxidation
Have affinity to retain harmful sulphur compounds

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