Characterizing Chemical Reactors: Team Activity and Idealized Reactor Designs - Prof. Holl, Study notes of Chemistry

Download Characterizing Chemical Reactors: Team Activity and Idealized Reactor Designs - Prof. Holl and more Study notes Chemistry in PDF only on Docsity! 1 T opic 1: Introduction T eam A ctivity: O rganize into team s of 3-4. C haracterize your assigned reactor in term s of: 1. M ixing 2. Inputs/O utputs 3. S hape 4. D raw a cartoon diagram , the sim plest you can, of your reactor elem ents. 5. S hare your cartoon on the board… 5 m in. 6. W hat is it that engineers w ould need to predict about a reactor? C onsider that you are trying to convince m anagem ent to build a reactor, to change the current design or inputs. 7. W hat basic principles w ould you then need to m athem atically m odel the perform ance of a reactor? 2 T eam 1: C atalytic converter http://w w w .aa1car.com /library/converter.gif 5 T eam 4: E m ulsion polym erization reactor en.w ikipedia.org 6 T eam 5: H aber process for nitrogen fixation to fertilizer ibchem .com 7 T eam 6: F erm entation reactor w w w -bioc.rice.edu 10 T em perature sim ulation for a B atch reacto r used in adhesive resin form ulation. F luent. S ee virtual dem o of C S T R at virtual.cvut.cz/virtual experim ents/cstr P lu g flo w reacto rs are assum ed to have good radial m ixing, but w ill have gradients along the length of the tube. 11 W hat overlying physics governs reactions and flow dynam ics happening in these reactors? A A A C N R t ∂ = −∇ • + ∂ B S L 2 nd ed, p 583. E quation of continuity for species A in m olar quantities. 12 W hat are the sim plifying design assum ptions for each of these ideal reactors? • B atch • C S T R • P F R 15 • D escriptions of chem ical reactions, kinetics – Interm ediates – T ransition state – E xtent of reaction… keeps track of num ber of tim es a reaction event, i.e.productive collision, occurs (m oles) – R eaction rate, r • If forw ard event occurs m ore often than the reverse, then ∆ξ is positive. If reverse event occurs m ore often than the forw ard, then ∆ξ is negative. If the system is at equilibrium , then ∆ξ is zero. – S electivity . r tV ξ ∆ = ∆