Chemical Process
Penicillin is separated from fermented broth by

Extractive distillation
Evaporation in calendria
Extraction with amyl or butyl acetate
Ternery azeotropic 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
It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
Its calorific value is very less

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