6.52 Single pass and overall conversion: The diagram below shows a chemical process in which component A reacts to become B in the reactor, with reaction stoichiometry of A → 2B, followed by partial separation of A & B in a distillation tower, and recycle of stream 4 (high in unreacted A) back to stream 1.  For the values given in the process stream table below, determine what is the single pass conversion and the overall conversion based upon component A.

Propylene is produced by the dehydrogenation of propane. The product stream leaving a dehydrogenation reactor is found to contain 900 mol/s propane, 99.75 mol/s propylene, and 95 mol/s of H2. This stream is passed to a distillation column, with the distillate containing all of H2, most of propylene, and 0.555% of the molar flow rate of the propane that enters the column. The bottoms from the column, which is recycled back to the reactor, has a propylene molar flow rate equal to 5% of that in the distillate. The distillate is then passed to a second distillation column in which all of the H2 is recovered in the distillate and all of the organics (propane and propylene) are recovered in the bottoms. a) Construct a process flow diagram for this system.

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…

Ethane (C2H6) gas at mass flow rate of 1.5 kg/min is mixed with air (O2 + 3.76N2) at mass flow rate of 1 kg/sec in a steady-state, steady-flow isobaric combustion process. All reactants enter the process at 298 K and 100 kPa, and the fuel burns to complete combustion. a) Determine the Air-Fuel Ratio (AFR) b) Write a balanced reaction equation based on one mole of fuel c) Determine the excess air fraction (%) d) Assuming that the combustion products exit the system at 1000 K, determine the volumetric flow rate of the combustion exhaust (m3 /s) e) Assuming that the combustion products exit the system at 1000 K, determine the rate of heat transfer to/from the system (kW)Repeat steps d and e, but assuming that the combustion product exit the system at 2000 k. Using the values in part e for 1000 k and 2000 k, apply linear interpolation to estimate the adiabatic exit temperature (?̇ = 0) for the combustion products. Next, using conservation of energy analysis, solve for the adiabatic exit…