Energy balance around the II condenser

Energy balance around the Benzene Column:
Since water is added as washing liquid to the extracted aromatic stream, there will be a
considerable temperature drop in the system and further more the enrgy losses in clay
treater and separator also contributes to the temperature drop. ∴Assume the feed
temperature to the Benzene column = 98 o C and the refference temperature is taken as
=0 o C
∴(Cp) B = 1.856 kJ/kg.K
(Cp) T = 1.809 kj/kg. K
(Cp) X = 1.841 kJ/kg.K
∴ (Cp) avg. = Σ (x i x Cp i )
and,
= 1.825 kJ/kg.K
(λ)B = 389.5 kJ/kg
(λ)T = 391.3 kJ/kg
(λ)X = 396.2 kJ/kg
Now assuming the Reflux Ratio as;
R = 1.2
∴The flow rate to the condenser = ( R + 1 ) D
= (1.2 + 1) 1.014
= 2.2308 kg/s
∴The heat load on the condenser;
Qc = m x λ
= 868.89 KW
To find Q b;