Q1. The fresh feed to the process contains 19.6wt%K2SO4. The wet filter cake consists of solid K2SO4 crystals and a 40.0wt%K2SO4 solution, in a ratio 10kg crystals/ kg solution. The filtrate, also a 40.0% solution, is recycled to join the fresh feed. Of the water fed to the evaporator, 45.0% is evaporated. The evaporator has a maximum capacity of 175kg of water evaporated/s. (a) Assume the process is operating at maximum capacity. (i) Draw a completed box flow diagram. (ii) Label the boundary and streams for each system. (b) Provide the degree-of-freedom analysis for the overall system and subsystems. Use the table to show the result. (c) Calculate (i) the maximum production rate of solid K2SO4, (ii) the rate at which fresh feed must be supplied to achieve this production rate, (iii) the ratio kg recycle /kg fresh feed. (iv) the composition and feed rate of the stream entering the crystallizer if the process is scaled to 75% of its maximum capacity [10+5+15marks]