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Chemical Engineering Homework Help

Chemical Engineering Homework Help

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Chemical Engineering Assignment Help

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CH7003 – Practice Problem Set 1

  1. Q1. The following parallel reactions are known to occur (C A is the concentration of A):

{" "} A R r 1 10C A 0.5 Mole/ Lmin

{" "} A S r 2  5C A Mole/ Lmin

{" "} A T r 3 C A 2 Mole/ Lmin

Q2.The feed concentration is CA0=10 mole/L. The volumetric flow rate is 1000L/min. T is the desired product.

  • Find the optimum selectivity and the{" "} conversion at that point. What is the preferred reactor (PF or CSTR)?{" "}
  • Find the optimum yield and the conversion at that yield. (Please use a graph paper){" "}
  • Express r in terms of CA and describe{" "} how you can graphically determine the volume of reactor needed.
  1. Q3. CSTR and PFTR reactors are used in series for the reaction A 4B, r = kCA 2. The feed consists of 90 mol% A and 10mol% inert gas. A, B, and the inert gas can be regarded as ideal gases. v0 = 5 liter/min, k = 1 liter/mole min, and CA0 = 2 moles/liter. If the conversion after the first reactor is set at 50% and after the second reactor is set at 80%, how should you arrange the reactors to minimize the reactors’ total volume, and what should be the sizes of these two reactors?{" "}
  1. A 100‐Litre CSTR is used for a reaction that follows a 2nd‐order rate law:

{" "} ‐ra = kCA0 2(1‐X)2{" "}

where X is the conversion and CA0 is the inlet concentration of the limiting reactant. A conversion of 75% is achieved in the CSTR. A PFR of the same volume is added in series to the CSTR to increase the conversion. Should it be added before or after the CSTR? What is the final conversion?{" "}

  1. Three reactions occur in an isothermal batch reactor:

A —> B r1=k1CA k 1=0.40 h‐1

A —> C + D r2=k2CA k 2=0.15 h‐1

2A —> E r3=k3CA k 3=0.35 h‐1{" "}

Given the following initial concentrations, what is reaction time needed for 90% conversion?

{" "} CA0= 10 mol/L CB0= 0 mol/L Cc 0= 0.8 mol/L CD0= 0.8 mol/L C E0= 0.5 mol/L

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