Question

I'm confused how to do part b-iii. It should be an answer of 50 kg/h

1 One hundred kilograms per hour of a solution that is one-fifth by mass KCI and the rest water is concentrated by removing 60 kg of water per hour in an evaporator. Part of the concentrated stream leaving the evaporator is recycled and joins the fresh feed at the evaporator inlet. The other part of the evaporator outlet stream is fed into a filter dryer in which the KCl-water mixture is further concentrated to 98% w w KCL The stream entering the evaporator contains 70% w/w water. (a) Draw the process kow diagram showing all fow rates and compositions given. [4 marks) (b) Calculate the flow rates and compositions of the tollowing materniat streams (i) Concentrated (98% w/w) producti )Water leaving the filter-dryer. (ili) Recycle stream (v Streams entering and leaving the evaporator [3 marks] [3 marks] [8 marks] (2 marks)

Answer 1

removing 6oKgqw๗a A) dije 18.ci product (a e-l.wla) concentrated じ)

ji) a, edes leaving filte-chy eg tDeten in ateh out 60 + fa, +0,0 2 x 20.408 80 195 k (i Recycle stean Dryen feed -19.592+20.408 UotglhY. feed tetes in ate ou Tot al balance ts iven b Recle rate is Jatev Civ ) ,stream entei"1 and leavinY the evapaata produ 나 from ev49dh Q , 160-60