Exit gas from a chlorinator consists of a mixture of 20 mol% chlorine in air. This concentration is to be reduced to 1% chlorine by water absorption in a packed column to operate isothermally at 20°C and atmospheric pressure. Using the following equilibrium x-y data, calculate for 100 kmol/h of feed gas:

(a) The minimum water rate in kilograms per hour.

(b) NOG for twice the minimum water rate. Data for x-y at 20°C (in chlorine molefractions):

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0.0001 0.00025 0.0003 0.0002 0.00015 0.006 0.012 0.024 0.04 0.06 y