Question 1:

A) How does the catalyst affect the heat of the reaction?

(a)Makes it more endothermic

(b)Makes it more exothermic

(c) Has no effect

(d) It depends on the specific reaction

B) What is the rate of heat exchange between a CSTR and a heat exchanger if we assume that the mass flow of refrigerant is so high that its temperature can be considered constant. The surface of the heat exchanger is 8.3 m2, the total heat transfer coefficient U is 324 J / m2 s oC the coolant temperature is 15oC and the reactor 88oC.

(a) 324 kW

(b) 63.5 kW

(c) 196.3 kW

(d) 228.6 kW

How can you increase the U value of a reactor?

(a) Increase the heat transfer area

(b) Use a less conductive reactor wall material (c) Improve the mixing of the reaction liquid

(d) Operate on a semi-batch reactor

C)What is the molar flow of refrigerant required for the cooling exchanger of a CSTR operating at 88oC if the exchanger has an area of 8.3 m2, total heat transfer coefficient U 324 J / m2 s oC, the refrigerant has inlet and outlet temperatures 15 and 35oC and the refrigerant has an average heat capacity of 11 J / mol K;

a)24.65 mol / s

(b) 763.5 mol / s

(c)2489 mol / s

(d)11 mol / s

D)What is the advantage of operating with a large temperature difference between the reactor and the heat transfer fluid?

(a) Increases mixing

(b) Reduces the accumulation of unwanted material in equipment

(c) Increases selectivity

(d) Increases the rate of heat transfer

Answer with explanations. Thanks