Consider Figure E17.6(a), in which the overall heat transfer coefficient (U) is assumed to be 25 W/m °C. It can be noted that in Figures E17.6(b) and E17.6(c)(b), the transients in exit temperature and CO concentration appear to be negligible. Now increase the flowrate of benzene to 0.01 kmol/h, while keeping the flowrate of air constant. Simultaneously increase the temperature of air to 520°C. Did you notice any difference in the transient profile of temperature and benzene and CO concentration at the exit of the reactor compared to what is obtained in Example 17.6? Why or why not?

Example 17.6

Figure E17.6

Transcribed Image Text:

Figure E17.6(a) shows the schematic of a cooled tubular reactor in which maleic anhydride is being produced by oxidizing benzene [15]. This problem is similar to the problem in Appendix B.5. However, there are some differences in the problem specification in this example compared to that in Appendix B.5. Ignoring the quinine formation reaction in Appendix B.5, the following reactions are considered: