Ejercicios resueltos, Exámenes de Ingeniería Química

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BBE 3033 FINAL L Mm Air at 45%C and 10% relative humidity is to be humidified adiabatically to 60% relative humidity, Use the psychometric chart to obtain the Tollowing numbers: (a) (5 points) The dry bulb and adiabatic saturation temperature of the final air. (b) (5 points) The dew point of the final air (e) (5 points) The absolute humidity and humid volume 0 final air, (d) (3 points) The rate at which water must be added to humidify 15m*/min of the entering air. (20 points) Two aqueous sulfuric acid solutions containing 20.0 wt% FH2SOs (specific gravity=1.139) and 60.0 wt % H>SOy (specific gravity=1,498) are mixed to form a 4.00 molar solution (specific gravity=-1,213). Assuming 100 kg of 20% solution as the basis calculate: (a) (10 points) the mass fraction of sulfuric acid in the product solution. (b) (10 points) the feed ratio (Hiters of 20% solution/liter of 60% solution). (30 points) A rotary dryer operating at atmospheric pressure dries 10 tons/day of wet grain at 70F, trom a moisture content of 10% to 1% moisture. The air flow is countercurrent to the flow of grain, enters at 225F dry bulb and 110F wet-bulb temperature, and leavos at 125F dry-bulb (sce figure). Saturated Air 125F dry bulb q¿_— __—-— Air, 225F dry bulb — | po “8 110F wet bulb j AAA NA Grain, 1% water Grain, 10% water CTE = 7 L1OF 7OF Q Determine: (a) the humidity of entering and leaving air if the latter is saturated, (b) the water removal in pounds per hour, (e) the daily product output in pounds per day, and (d) the heat input to the dryer. Assume that there is no heat loss from the dryer, that the grain is discharged at 110F, and that its specific heat is 0.18. (30 points) A fuel gas containing 85 mole % methane and the balance ethane is burned completely with pure oxygen at 25 “C at latm. Suppose the reactor is continuous. Take a basis of calculation of 1 mols of the fuel gas, combusted with stoichiometric amount of oxygen, (a) (10 points) Please calculate the rate at which heat must be transferrcd from the reactor if the products are brought back down to 25 *C. (b) (15 points) Please calculate the final temperature of the combustion gas if the process is under adiabatic condition at constant pressure latm. (e) (5 points) Please calculate the final volume of the combustion gas if the process is under adiabatic condition at constant pressute Latm. 1f the volume of the reactor can only be coristant and the pressure can change, what do you expect to happen to the reactor?