You are evaporating black liquor from 10% to 80% solids. The flow rate of 10% solids black liquor is 900 gal/min. Assume the density of this liquor to be 1000 kg/m3 . a) How much energy is required to evaporate this water? B) Report the estimated amount of energy you would need for 2, 3 , 4 , 5, and 6 effects. C). Value energy at $6/GJ. How much money do you save as you increase the number of effects? D) If each effect costs $2 million dollars, and the annualized cost of capital is 18% of the capital, what is the optimal number of effects to use?