02/ [Extra Credit, 2S points hermodynamic Limitations and Reactor Design Reversi
ID: 805892 • Letter: 0
Question
02/ [Extra Credit, 2S points hermodynamic Limitations and Reactor Design Reversible reactions are known to be subject to equilibrium limitations. the limitations (eq rium conversion) however, might depend on type and the operating conditions The plot below shows the effect of adding inerts (0, Ci"/CA") the equilibrium limitations for a constant volume batch reactor and those of an (equivalent) tubular (with a negligible pressure drop) reactor, for the elementary gas-phase reaction A 2 B Equ librium umilations in Datch and rlow Reactor. Constant Volume Batch Reax 07 Flow Reactor with negligible Presiure Dvo 066 0.45 04 0 02 0.4 06 08 1.2 1.4 1.6 1.8 2 Fraction of inerts, c ca Note: Explain you answers (you should support them with equations, but no calculations are required!) (a, 15 points) Can you explain why flow reactors seem to be less restricted by equilibrium limitations than constant volume batch reactors? CHE 404: Chemical Reactor Design First Mid-Term Exam Page 8/11Explanation / Answer
For a gaseous phase ractions, A ?2B, the equilibrium constant = pB2/pA.
Thus adding Iner gas to the system at constant volume, decrease the partial pressure of both A and B. Because the above reaction proceeds with volume expansion, decreasing pressure increases the equlibrium constant.
In a flow reactor, however, the pressure drop is negligible, and therefore, the extent of affect is less pronounced than that in constant volume reactor.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.