Chemical Process
Economics of 'Solvay Process' depends upon the efficiency of

Ammonia recovery
Ammoniation of salt solution
Ammonia recovery and size of the plant
Carbonating tower

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Chemical Process
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

Tar neutralises the residual acids present in pitch
Its calorific value is very less
All of these
It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop

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