(Solved): An organic compound containing 10%DM at 50\deg C is fed to a double-effect evaporator by the feedba ...

An organic compound containing

at

is fed to a double-effect evaporator by the feedback method to be concentrated. Saturated steam is supplied to the first effect as the heating medium at 5000 g.per second and

absolute pressure. In the

effect, the evaporation pressure is constant at

. The heating surface area of the evaporator is

. Heat transfer coefficients are calculated as

and

. The specific heat of the solution can be taken equal to that of water. If the boiling.point rise is neglected, calculate the concentration of the concentrated solution (product) leaving the system at the evaporator outlet, how many kg.per second should be fed to the system, the evaporation capacity of the system and the steam economy.