A butane isomerisation process produces 70 k.mole/hr of pure iso-butane. 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_________________?
(A) 3 kmole/hr
(B) 4 kmole/hr
(C) 5 kmole/hr
(D) 6 kmole/hr
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