1. (30 pts) To use in production of a fertilizer, it is desirable to obtain KNO3 with 99.5% purity from 1000kg/h of an aqueous solution containing 15%KNO3 and 1.5% insoluble impurities. The proposed process is depicted below. The fresh feed and the recycle are mixed and sent to an evaporator in which KNO3 is concentrated to 50%. This solution is cooled in a crystallizer yielding two separate streams: one consisting of pure crystals of KNO3 and carrying a certain amount of liquor, the other stream composed of only liquor. This latter stream is in part recycled and the rest is purged to prevent the accumulation of impurities. This stream contains 0.6kgKNO/KgH2O and 12% impurities. The wet crystals are completely dehydrated in a dryer. a) What is the mass flow rate of the purge (kg/h) ? b) What is the product mass flow rate (kg/h) ? c) What is the efficiency of the process (kgKNO3 in the product/ kgKNO3 fed)