Problem 1 Common salt and CaCO; react according to the following flowchart to produce CaCl2. The conversion of CaCO; in the reactor is 76%, based on the input to the reactor. All the unreacted CaCO3 is recycled back to the reactor. Calculate a) The kg of CAC12 produced per 1000 kg of feed. b) The molar composition of the exit stream c) The kg of CaCO3 recycled per 1000 kg of feed Note: NazCO3 is not reacting. Write the stoichiometry cquation

The formation of NO from Na and O is to be carried out in a small batch reactor. As a first approximation, we shall consider that the reaction time is more rapid than the time of cylinder compression, consequently, the reaction takes place isothermally in car eylinder at 2700 K, in a constant volume reactor (cylinder) and under a pressure of 20 atm, the initial concentration of N2 is 0.0696 mol/liter. By a specifying constant volume, we are assuming that reaction take place rapidly with respect to the movement of the piston in the cylinder. Consider that the feed consists of 77% N2, 15% Oz and 8% other gases, which may be considered inert. At this temperature the equilibrium constant (Ke-0.01). The reaction is reversible: Na + 0z + 2NO With a rate equation: Cho -TN, = k ( CN, Co, Ke Calculate: a) The equilibrium conversion of N2. b) The time required to achieve 80% of the equilibrium conversion. The formation reaction rate- constant k at this temperature is 1.11 liter mol.h' Hint: dx…

2.133 Methanol is being produced according to the reaction CO + 2H2 CH3OH A synthesis gas stream consisting of 67.1% H2, 32.5% CO, and 0.4% CH4 (by mole) is fed into the process described below at a rate of 100 mol/h. The effluent stream from the reactor is fed into a separator (Fig. P2.13) where the methanol is completely removed, and the unconverted reactants are recycled to the reactor. To avoid the buildup of methane, a portion of the recycled stream is purged. At present operating conditions, the CO 1 2 Reactor 3 Separator 4 → Methanol 5 7 Purge Figure P2.13 Methanol rector with a separator.

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An experiment on the growth rate of certain organism requires an environment of humid air enriched in oxygen. Three input streams are fed into an evaporation chamber to produce an output stream with the desired composition. A: Liquid water fed at rate of 20 cm³/min B: Air (21% O₂ and 79% N₂) C: Pure O₂ with a molar flow rate one-fifth of the molar flow rate of stream B The output gas is analyzed and is found to contain 1.5 mole% water. Draw and label the flowchart of the process, and calculate all unknown stream variables.

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Using RCRA procedures, determine if the following are classified as hazardous wastes. State the reason why or why not is is hazardous. If it is a hazardous waste, state the RCRA waste category number. Assume that the industry porducing the waste is a RCRA hazardous waste generator. 1. Sawdust in a warehouse contaminated by a spill of pentachlorobenzene. 2. Sludge from the treatment of water from the chemical conversion coating of aluminum. 3. An aqueous industrial waste stream from a plastic manufacturing plant that is discharged to a river.

In the separation process illustrated below, fresh feed stream F consists of 20% A and 80% B on a mass basis. F mixes with recycle stream R to produce mixed stream M, which enters the separator. The mass ratio of A:B in stream M is 2:3. Product stream P, which leaves the separator at 100 kg/h, is pure A, while waste stream W is 5 mass % A. Recycle stream R is 80 mass % A. (a) Find all unknown stream flow rates. (b) Calculate the recycle ratio.

Acetic acid anhydride needs to be hydrolyzed in a continuouslyoperating cascade reactor consisting of four identical stirred tankreactors (CSTRs). The hydrolysis reaction is assumed to followfirst-order kinetics in diluted aqueous solutions.a) How large should the CSTRs be to achieve a conversion of95% at the outlet of the cascade when all the reactors operate at15°C?[10 marks]b) How large should the CSTRs be to achieve the sameconversion when all the reactors operate at 40°C?[3 marks]c) How large should be the CSTRs to achieve the sameconversion if the first reactor operates at 10°C, the second oneat 15°C, the third at 25°C, and the fourth at 40°C?[12 marks]Input volumetric flow rate of 90 L min-1is used for all cases.The rate constant has the following values at the giventemperatures: T (degrees) : 10 /15/25/40 k(min^-1) : 0.0567/0.0806/0.1580/0.3800

Powerplant cooling water with a temperature of 35 °C and a flowrate of 10 m3/s is discharged into a river with a temperature of 10 °C and a flowrate of 50 m3/s.a) What will the new temperature of the river be downstream of the mixing point? Draw and label your figure and state any assumptions.b) Using your knowledge of Henry’s law to justify your answer, how will this change in river temperature influence the amount of oxygen gas dissolved in the water?