CME 323 Lecture 8 , 9, & 10 - Batch, CSTR, & PFR Isothermal Reactor Design 2023/2024 passed

CME 323 Lecture 8 , 9, & 10 - Batch, CSTR, & PFR Isothermal Reactor DesignBatch operation - correct answer - no inflow & outflow - well-mixed - for liquids - no density change - for gas - no volume change time needed to achieve a first order reaction - correct answer t = 1/k1 ln( 1 / (1-X) ) time needed to achieve a second order reaction - correct answer t = 1/k2CA0 dX/(1-X) ^2 from 0 to X Damkӧhler Number (Da) - correct answer provides a quick estimate of the degree of conversion that can be achieved in CSTR Da - correct answer -rA0V/FA0 "A reaction rate" / "A convection rate" Da for first order (IR) - correct answer Da = τk Da for second order (IR) - correct answer Da = τkCA0 If DA _____, then X _____ - correct answer 10 , 0.9 0.1 , 0.1 X = τk / (1 + τk) - correct answer X = Da1 / (1 + Da1) CSTRs in series - correct answer - no volumetric flow rate ( v = v0) - all operating at the same temp (k1 = k2) For CSTRs in series, when Da is _____, ____ conversion is achieved with ____ reactors - adding more reactors is ____ - correct answer - high - 90% - two or three - not really cost effective For CSTRs in series, when Da is ____, the conversion continues to ____ with each reactor ____ - correct answer - low - increase - added CSTRs in Parallel: if reactors of equal size are operated at the _____ and have ____, the ____ will be the ____ in each reactor. - correct answer - same temp - identical feed rates - conversion - same The conversion achieved in any of the reactors in ___ is ___ if the reactant were fed in one stream to ____ - correct answer - CSTR - the same - one large volume