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How the feed stream does enters the nth stage of the staged counter current extraction?

How the feed stream does enters the nth stage of the staged counter current extraction? Correct Answer Extracting solvent enters 1st stage

The Raffinate phase is collected from the 1st stage while the extract phase is collected from the nth stage. Using the method of staged counter current process of extraction, the concentration driving force is maintained more or less uniform in all the stages of extraction comprising the cascade.

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