Process Calculations GATE-1999
Q 1: A solution of specific gravity 1.0 consists of 35 % A by weight and the remaining B. If the specific gravity of A is 0.7, the specific gravity of B is
Q 2: Pure A in the gas phase enters a reactor. 50 % of this A is converted to B through the reaction A→3B. The mole fraction of A in the exit stream is
Q 3: It is proposed to produce acetaldehyde by oxidation of ethanol in the gas phase
C_2H_5OH(g)+1/2O_2(g)\rightarrow CH_3CHO(g)+H_2O(g)The ratio of air to ethanol in the fresh feed (before it is mixed with the recycle stream) is 10 to 1. The conversion of ethanol on a single pass through the reactor is 25 %. The unreacted ethanol is completely separated from the reaction products and recycled. What is the ratio of the recycle stream to the fresh feed stream? What is the composition of the outlet stream from the reactor in mass fraction and mole fraction?
Q 4: CaCO3 slurry has to be dried. The drier is designed to remove 100 kg of moisture per hour. Air at 200 C and 40 % relative humidity, enter the drier, and leave at 650 C and 65 % relative humidity. What is the weight (in kg) of bone-dry air required per hour? The atmospheric pressure is 103 kPa. If the humidity of the air entering the drier can be varied, what is the minimum amount of dry air required? The constants for Antoine equation for the vapor pressure of water in mm Hg may be taken as A = 18.306, B = 3816.44, and C = −46.13.