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1.

Percy prepares vegetable curry (liquid) in a pressure cooker. If the raw potatoes are P, the raw tomatoes are T, the raw onions are O, and the cooked meal is M, then 2P + T + O → 3M may represent the cooking process. Sometime during the process, Manu opens the lid and checks the curry to find that the potatoes are half-cooked (take XP = 0.5). Volume of the cooker is 5L and CPo = CTo = COo = 1.5. What can you say about the composition in the cooker at the instant of time when the lid is opened, if initial temperature was 310K?(a) XT = 0.35(b) CO = 1.125(c) T = 380K(d) CM = 2.5The question was posed to me in an internship interview.My enquiry is from Introduction to Reactor Design in section Homogenous Reactions in Ideal Reactors of Chemical Reaction Engineering

Answer» RIGHT option is (B) CO = 1.125

Best explanation: If we assume the PRESSURE cooker to be a batch reactor, P, T, O as the reactants and M as the product, we can USE material balance to get

XT = CAo*b*XA/(a*CBo)

CO = CAo*(1-0.5*XA)

CM = CAo*(3*XA)

It is a liquid reaction so CHANGE in volume can be ignored. Thus we cannot say anything about the temperature based on the given information.
Discussion
2.

Which of the following is NOT a part of reactor design?(a) Size of the reactor(b) Type of the reactor(c) Flow rates of the reactant and product streams(d) Method of operationThe question was posed to me at a job interview.This question is from Introduction to Reactor Design in division Homogenous Reactions in Ideal Reactors of Chemical Reaction Engineering

Answer»

Correct option is (c) Flow rates of the REACTANT and product streams

To explain: In general, most reactors are not a stand-alone unit. They are PART of huge plants. This means that the flow rates of reactant and/or product streams depend on a lot of factors and may even be pre-decided. The purpose of reactor design, THEREFORE, is to determine the reactor size and type and the SUITABLE METHOD of operation to meet the flow rate or other requirements.
Discussion