molasses is fermented to obtain liquor containing ethyl alcohol. For this, CO2 rich gas containing some ethyl alcohol will be used. Alcohol will be gained by absorption by using water in a sieve type...

molasses is fermented to obtain liquor containing ethyl alcohol. For this, CO2 rich gas containing some ethyl alcohol will be used. Alcohol will be gained by absorption by using water in a sieve type rack column. Find the required number of equilibrium stages under the specified conditions.

NOTE: Gas - LIQUID counter current, isothermal, isobaric system, mass transfers other than ethyl alcohol can be neglected.

Inlet gas: 180 kmol / h; 98% Co2 2% ethyl alcohol; 30 ° c, 110 kPa

Inlet liquid: 100% water; 30 ° C, 110 kPa

Required ethyl alcohol recovery: 97%