1. Lecture 10 Tuesday 2/5/08 Definition of Selectivety Instantaneous S D / U = r D /r U Overall = F D /F U Semibatch Reactors Read Problem P4-23 on page 246 before Lecture begins

15. Semibatch and Rate Law Intro Semibatch reactors example: A + B → C + D A B, v 0 Initial V 1)Mole balances: A: in – out + gen = acc 0 - 0 + r A V = dN A /dt B: F B – 0 + r B V = dN B /dt

16. 2) Rate Law: 3) Stoich: 4) Parameters:

17. example: A + B → C + D + CO 2 1)Mole balances: mass balances: 2) Rate law: A B, v 0 CO 2

18. 3) Stoich: 4) Parameters:

19. Finding the Rate Law (Done in a batch reactor) Assume power law relation: Guess and check for α = 0, 1, 2 and check against experimental plot ttt CACA 1/C A ln(C A0 /C A )