1 / 25

Lecture 20 Thursday 3/20/08 Multiple Reactions with Heat Effects

Lecture 20 Thursday 3/20/08 Multiple Reactions with Heat Effects. User Friendly Equations Relate T and X or F i. Heat Exchange. Elementary gas phase reaction carried out in a PBR The feed consists of both inerts I and Species A with the ratio of inerts to the species A being 2 to 1.

wherry
Download Presentation

Lecture 20 Thursday 3/20/08 Multiple Reactions with Heat Effects

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lecture 20 Thursday 3/20/08Multiple Reactions with Heat Effects

  2. User Friendly Equations Relate T and X or Fi

  3. Heat Exchange Elementary gas phase reaction carried out in a PBR The feed consists of both inerts I and Species A with the ratio of inerts to the species A being 2 to 1. (a) Adiabatic. Plot X, Xe, T and the rate of disappearance as a function of V up to V=40 dm3. (b)Constant Ta. Plot X, Xe, T, Ta and Rate of disappearance of A when there is a heat loss to the coolant and the coolant temperature is constant at 300 K for V = 40 dm3. How do these curves differ from the adiabatic case? Variable Ta Co-Current. Plot X, Xe, T, Ta and Rate of disappearance of A when there is a heat loss to the coolant and the coolant temperature varies along the length of the reactor for V = 40 dm3. The coolant enters at 300 K. How do these curves differ from those in the adiabatic case and part (a) and (b)? (d) Variable Ta Counter Current. Plot X, Xe, T, Ta and Rate of disappearance of A when there is a heat loss to the coolant and the coolant temperature varies along the length of the reactor for V = 20 dm3. The coolant enters at 300 K. How do these curves differ from those in the adiabatic case and part (a) and (b)?

  4. Mole Balance (1) Rate Law (2) (3) (4)

  5. Stoichiometry (5) (6) Parameters (7) – (15)

  6. Energy Balance Adiabatic and CP = 0 (16A) Additional Parameters (17A)&(17B) Heat Exchange (16B)

  7. (16B) A. Constant Ta (17B) Ta = 300 Additional Parameters (18B – (20B): Ta, , Ua, B. Variable Ta Co-Current (17C) C. Variable Ta Counter Current (18C) Guess Ta at V = 0 to match Ta = Tao at exit, i.e., V = Vf

  8. User Friendly Equations Relate T and X or Fi

  9. Heat Exchange Elementary liquid phase reaction carried out in a PFR The feed consists of both inerts I and Species A with the ratio of inerts to the species A being 2 to 1.

  10. Multiple reactions with heat effects Multiple Rxns Mole balances – every species (no conversion!) Rates – rate laws net/relative rates Stoichiometry – Heat effects –

  11. Rate is given for 2C, but ΔHRis given for 2A! Make sure it is in respect to A; A needs a coefficient of 1!!!!!!! 1) Mole balance:

  12. 2) Rate laws: 3) Stoich: 4) Heat effects: Parameters:

More Related