A butane isomerisation process produces 70 kmole/hr of pure isobutane. A purge s

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A butane isomerisation process produces 70 kmole/hr of pure isobutane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be

Options:

A . 3 kmole/hr

B . 4 kmole/hr

C . 5 kmole/hr

D . 6 kmole/hr

Answer: Option C

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