Let’s assume that the reaction, which in this case happens to be an elementary reaction, A → B + C occurs in an ideal isothermal batch reactor. The rate constant is k = 0.1 sec-1. Find the time required for CA to reach 0.5 x CA0 (i.e., half of its initial concentration).

Consider the process shown below where a feed of pure A enters a reactor where the reaction A-B occurs. The separator after the reactor is not working properly. The final circuit product is only 95 mol. 9% B with 5 mol.9% A, and the recycle stream contains 5 mol.% B and 95 mol.% A. Recycle (R) x4.R = 0.95, xB.R = 0.05 Feed (F) Reactor Product (P) XAF = 1 Separator A→ B X4P = 0.05 XB.F = 0 XB.P = 0.95 If the single pass conversion in the reactor is Cs = 17 %, then determine the required recycle rate, expressed as moles recycled (Stream R) per mole of feed (Stream F). Enter your answer rounded off to two decimal places.

Answer question 1 & 2

s.) 7) The elementary reaction A+B → D is to be carried out to obtain a desired product (D). The rate constant for this reaction is k₁ = 150*exp(-5,000/T). Unfortunately, under conditions required for the reaction to occur, species B also undergoes a second-order decomposition to form an undesired product, B2U, with ry = k₂C, and k₂ = 300*exp(-2,000/T). 212 - a) What is the instantaneous selectivity for this system (SD/U)? Your answer must be simplified as much as possible. 4 Species: A, B, C, D, U YD = rD -VA ŶD= FD KD CA KU FAO-FA 4-02 b) Describe a reactor system (draw a schematic AND describe with words) and operating conditions you would use to maximize the selectivity to D.

Estimate the activation energy and pre-exponential factor for a first-order decomposition reaction that has the following rate constants at these temperatures. k (10-³s-¹) T (°C) Ea= A= 2.46 0 kJ/mol x10¹5 45.1 20.0 576 40.0

The second-order liquid phase reaction C6 H 5COCH2Br + C6H5N⎯⎯→C6H5COCH2NC5H5Bris carried out in a batch reactor at 35°C. The specific reaction-rate constant is 0.0445 dm3/mol/min.Reactor 1 is charged with 1,000 dm3, where the concentration of each reactant after mixing is 2M. What will be the conversion and concentration of each species in reactor 1 after 10, 50, and 80minutes in the reactor that is being drained?

You are carrying out a reaction in the laboratory. You need to convert 1.00 mole of reactant X into products. This reaction shows first-order kinetics, and the reaction mixture has a constant volume of 1.00 L. At 1:00pm, you start the reaction at 25\deg C with 1.00 mole of reactant X. At 2:00pm, you find that 0.70 moles of reactant X remain. You immediately increase the temperature of the reaction mixture to 35\deg C. At 3:00pm, you discover that 0.25 moles of reactant X are still present. You want to be able to finish the reaction by 4:00pm, but you cannot stop the reaction until only 0.01 moles of reactant X remain. You must increase the temperature again. What is the minimum temperature required to complete the reaction by 4:00pm? (Remember, the reaction is complete when only 0.01 moles of X remain.)

Into a combustion reactor, hexane at 23 mol/s and 75% excess dry air are fed. The fractional conversion of hexane is 30%. Assume that air is 21 mol% oxygen and 79 mol% nitrogen. HINT: Consider all the reactants that exit the reactor. a.  Draw a complete flowchart of the process. Clearly state any assumptions. b. Perform a degree-of-freedom analysis. Clearly state which type of DOF analysis you are doing. c. What is the mole fraction of carbon dioxide in the flue gas on a dry basis?

The overall gas phase reaction  3A --> B + 2C occurs via the following sequence of elementary steps 2A <--> I1 + B    k1,k-1 A + I1 --> 2I2        k2 I2 --> C               k3 1. write an expression for the overall reaction rate, r, in terms of the rate step 3, r3 2. using the answer from 1, obtain an expression for the reaction rate, r, in terms of rate constants and concentrations of reactants and products, only use PSSH.

(Please correct answer and don't use hand rating). Consider the following reaction between naphthalene and oxygen in the gas phase with STOICHOOMETRIC FEED in a flow reactor without pressure drop: see in the image Which of the following options would be the value of the "delta" parameter taking oxygen as the limiting reagent ? a)-0,5 b)+0,5 c)-1 d)-1/9