TUTORIAL 4 SOLUTIONS Lecturer Miss Anis Atikah Ahmad

QUESTIONS The liquid phase reaction A+B C follows an elementary rate law and is

(a)Select type of reactor that could be used by showing appropriate calculations. CSTR 1.

(a)Select type of reactor that could be used by showing appropriate calculations. CSTR Using

(a)Select type of reactor that could be used by showing appropriate calculations. PFR 1.

(a)Select type of reactor that could be used by showing appropriate calculations. 200 dm

(b) Calculate time taken to achieve 90% conversion in a 200 dm 3 batch

(c) Repeat part (b) if the reactor were cooled to 0°C Using the same

(d) Calculate the conversion if the CSTR and PFR were operated at 300 K

(e) Repeat part (d) if CSTR and PFR are connected in parallel with an

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TUTORIAL 4 SOLUTIONS Lecturer: Miss Anis Atikah Ahmad Tel: +604 976 3245 Email: anisatikah@unimap. edu. my

QUESTIONS The liquid phase reaction A+B C follows an elementary rate law and is carried out isothermally in a flow system. The concentrations of A & B feed streams are 2 M before mixing. The volumetric flow rate of each stream is 5 dm 3/min, and the entering temperature is 300 K. The streams are mixed immediately before entering. Two reactors are available. One is gray 200 dm 3 CSTR that can be heated to 77°C or cooled to 0°C, and the other is a white 800 dm 3 PFR operated at 300 K that cannot be heated or cooled but can be painted red or black. Note k = 0. 07 dm 3/mol. min at 300 K and E = 20 kcal/mol. (a) Select type of reactor that could be used by showing appropriate calculations. (b) Calculate time taken to achieve 90% conversion in a 200 dm 3 batch reactor with CA 0 = CB 0 = 1 M after mixing at a temperature of 77°C. (c) Repeat part (b) if the reactor were cooled to 0°C (d) Calculate the conversion if the CSTR and PFR were operated at 300 K and connected in series. The entering volumetric flow rate is 10 dm 3/h. (e) Repeat part (d) if CSTR and PFR are connected in parallel with an entering flow rate of 5 mol/min to each of the reactor.

(a)Select type of reactor that could be used by showing appropriate calculations. CSTR 1. Design equation: 2. Rate Law: 3. Stoichiometry: 4. Combine:

(a)Select type of reactor that could be used by showing appropriate calculations. CSTR Using Arrhenius eq, find k at T=350 K Solving for X,

(a)Select type of reactor that could be used by showing appropriate calculations. PFR 1. Design equation: 2. Rate Law: 3. Stoichiometry: 4. Combine: 5. Solving for X: X= 0. 85

(a)Select type of reactor that could be used by showing appropriate calculations. 200 dm 3 CSTR gives higher conversion than 800 dm 3 PFR Thus, CSTR is chosen.

(b) Calculate time taken to achieve 90% conversion in a 200 dm 3 batch reactor with CA 0 = CB 0 = 1 M after mixing at a temperature of 77°C. Batch 1. Design equation: 2. Rate Law: 3. Stoichiometry: 4. Combine: 5. Solving for t:

(b) Calculate time taken to achieve 90% conversion in a 200 dm 3 batch reactor with CA 0 = CB 0 = 1 M after mixing at a temperature of 77°C. 5. Solving for t:

(c) Repeat part (b) if the reactor were cooled to 0°C Using the same equation in part (b), except the value of k is used at T= 273 K. From Arrhenius eq, Thus,

(d) Calculate the conversion if the CSTR and PFR were operated at 300 K and connected in series. The entering volumetric flow rate is 10 dm 3/h. v 0=10 dm 3/h.

(e) Repeat part (d) if CSTR and PFR are connected in parallel with an entering flow rate of 5 dm 3/h to each of the reactor. 5 dm 3/h. 10 dm 3/h. 5 dm 3/h.