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1.	For equal sized CSTRs in series carrying out 1^st order reactions of constant density, which of the following is true? (ki is the rate constant in a reactor ‘i’ in series)(a) k1 ≠ k2 ≠ … ≠ kn, τ1 = τ2 = … = τn(b) k1 = k2 = … = kn, τ1 = τ2 = … = τn(c) k1 = k2 = … = kn, τ1 ≠ τ2 ≠ … ≠ τn(d) k1< k2< …
Answer» The correct OPTION is (B) k1 = k2 = … = kn, τ1 = τ2 = … = τn Easy explanation: All the CSTRs are operated at the same TEMPERATURE. Hence, k1 = k2 = … = kn. The VOLUME of all the CSTRs is the same, V1 = V2= … = Vn. τ = \(\frac{V}{v_0},\) hence τ1 = τ2 = … = τn.

2.	State true or false.It is preferable to use a number of CSTRs in series to achieve a specific conversion than a single CSTR.(a) True(b) FalseThe question was asked in an international level competition.Query is from Design of CSTRS in Series topic in division Isothermal Reactor Design of Chemical Reaction Engineering
Answer» Correct ANSWER is (a) True Best explanation: TOTAL VOLUME required to achieve a GIVEN conversion is less than the volume of a single CSTR. A number of CSTRs in series approaches Plug FLOW behavior.