1. Reverse feed double-effect evaporator is used to concentrate a feed of 10% solids to 20%. The heattransfer coefficients are U1=300 and U2= of which has a surface area of 800ft2. Both the rise in boiling point and the heat of solution n The feed enters the 2 nd evaporator at 100F, and steam enters the first evaporator number 1 at 100 psi. The 2nd evaporator's vapor space is under 2 psia of pressure. Assume that liquid water has the same thermal capacity as all other liquid solutions. Determine the solution's feed rate ( F ) and product rat 20% solids solution. Initial assumptions for feed rate and inlet steam temperature are 1000lbm/hr and 350F. 2. A 30% solution of magnesium bromide at 100 kg/h is cooled and crystallized to a hexahydrate at 50C. Find the yield when: a. there is no evaporation b. 10% of water is evaporated