Question

Which one of the following statements is NOT correct with respect to a batch reactor?

• A. No reactant is added after the reactor has started operation.
• B. No product is withdrawn during the course of the reactor operation.
• C. The reactor operates under steady state.
• D. The reactor operation is carried out for a pre-specified duration.

Hint:

Batch reactors are always unsteady-state because the reaction progress changes with time.

Answer 1

The Correct Option is A

Step 1: Understand batch reactor fundamentals.
A batch reactor is a closed system in which all reactants are charged at the beginning. No reactant enters and no product leaves during operation. The mass inside the reactor remains fixed during the process.
Step 2: Check each statement.
(A) True — no reactant is added after start-up. This is a defining feature of batch reactors.
(B) True — no product is removed until the reaction is complete.
(C) False — batch reactors do \emph{not} operate at steady state. Conditions (concentration, temperature, reaction rate) vary continuously with time.
(D) True — batch reactors run for a fixed or predetermined reaction time.
Thus the only incorrect statement is (C).
Final Answer: (C)