flash distillation A three-stage flash unit is being operated in a plant. The feed enters flash drum 2 (FD2). The vapour from FD2 is cooled to a two-phase mixture and flashed in FD1. The vapour from FD1 is taken out as a product, while the liquid from FD1 is heated to the operating temperature of FD2 and returned to FD2. The liquid from FD2 is heated to a two-phase mixture and introduced into FD3. The liquid stream from FD3 is taken out as a product, while the vapour from FD3 is cooled to the operating temperature of FD2 and returned to FD2. The feed is 100 kg/h liquid containing 40% ethanol and the rest being water. This feed is heated to 87 °C and enters FD2. The flow rate and the composition of the vapour stream leaving stage 1 is 50 kg/h and 0.75, respectively. All the flash units are operating at 1 kg/cm2 Calculate the following: a) Sketch the process. b) What is the operating temperature of stages 1 and 3? c) The flow rates and compositions of all streams leaving the three stages.

Shown in the figure below is an electrical circuit containing three resistors and two batteries. R3 10 R2 R1 Write down the Kirchhoff Junction equation and solve it for I, in terms of I, and Iz. Write the result here: Write down the Kirchhoff Loop equation for a loop that starts at the lower left corner and follows the perimeter of the circuit diagram clockwise. Write down the Kirchhoff Loop equation for a loop that starts at the lower left corner and touches the components R1, R2, and 4V. The resistors in the circuit have the following values: R, = 130 • R2 = 50 R3 = 10 Solve for all the following (some answers may be negative): | Amperes I = I, = Amperes Iz = Amperes NOTE: For the equations, put in resistances and currents SYMBOLICALLY using variables like RR2,R3 and I,,12,13. Use numerical values of 10 and 4 for the voltages.