Chemical Process
Black liquor is converted into white liquor by

Selective liquid extraction
Evaporation and burning the concentrate followed by causticisation of products
Multi-effect evaporation only
Extractive distillation

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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

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

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