A binary mixture containing 50 mole % benzene and the remainder toluene at 10°C is fed continuously to a heated tank operating at 50°C. Two outlet streams at 50°C leave the tank. One of streams is vapor containing 68.4 % mole benzene, and the other one is liquid containing 40 % mole benzene. How much energy needs to be transferred (Q) to the mixture per mole of feed?

At approximately atmospheric pressure, methane gas is burned completely with 30% excess air. Both the air and methane enter the furnace at 30 °C saturated with water vapor, and the flue gases leave the furnace at 1500 °C. Calculate how much heat is lost from the furnace per mole of methane. In your solution, show analytically all calculations, including the analytical derivation of the number of moles of water vapor entering the furnace. Use steam tables to determine Psat, and compare your answer with the answer you would obtain using Antoine’s and Wagner’s equations. For the latter, you can determine A, B, C, D as in ** above.

A fruit juice at 20°C with 5% total solids is being concentratedin a single-effect evaporator. The evaporator is being operatedat a suffi cient vacuum to allow the product moisture to evaporate at 80°C, and steam with 85% quality is being supplied at 169.06 kPa. The desired concentration of thefi nal product is 40% total solids. The concentrated productexits the evaporator at a rate of 3000kg/h. Calculate the(a) steam requirements and (b) steam economy for theprocess, when condensate is released at 90°C. The specifi cheat of liquid feed is 4.05kJ/(kg°C), and of concentratedproduct is 3.175kJ/(kg°C).   A single-effect evaporator is being used to concentrate10,000 kg/h of tomato juice from 5% total solids to 30% totalsolids. The juice enters the evaporator at 15°C. The evaporatoris operated with steam (80% quality) at 143.27 kPa. Thevacuum inside the evaporator allows the juice to boil at 75°C.Calculate (a) the steam requirements and (b) steam economyfor the process. Assume the…

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3. Superheated steam at 300°C and 1 atm is to be fed to a heat exchanger. It is produced by mixing an available stream of saturated steam at 1 atm discharged from a turbine at a rate of 1150 kg/h with a second stream of superheated steam at 400°C and 1 atm. The mixing may be considered adiabatie. Calculate the amount of superheated steam at 300°C produced and the required volumetric flow rate of the 400°C steam.

A single-effect evaporator is concentrating a feed so 50 wt %. The solution has a negligible boiling-point elevation. The heat capacity of the feed is ep 4.06 kJ/kg. K and the feed enters at 15.6°C. Saturated steam at 101.32 kPa is available for heating, and the pressure in the vapor space of the evaporator is 15.3 kPa. A total of 4536 kg/h of water is to be evaporated. The overall heat-transfer coefficient is 1988 W/m2. K. What is the required surface area in m2, the steam consumption and the steam economy? State and explain 3 factors that may affect the process of evaporation.