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Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they.

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Presentation on theme: "Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they."— Presentation transcript:

1 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they take place. Lecture 16

2 Web Lecture 16 Class Lecture 25 – Thursday 4/14/2011 Bioreactors Monod Equation Yield Coefficients Washout 2

3 A given enzyme can only catalyze only one reaction. Urea is decomposed by the enzyme urease, as shown below. Michaelis Menten Equation The corresponding mechanism is: 3

4 Nutrient (S) + + Products cells more cells 4

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8 inoculum t=0 time  8 Cells + Substrate  More Cells + Product

9 9 Exponential Growth Phase Death Phase Stationar y Phase Lag Phase 0 time lnC c a)Phases of Bacteria growth: I. Lag II. Exponential III. StationaryIV. Death b) Monod growth rate law:

10 10 Accumulation = [In] - [Out] + [Growth] - [Death]

11 Rate Laws: C p *= Product Concentration at which all metabolism ceases 11

12 12

13 13 Can’t separate substrate consumption used for cell growth from that used for product formations during exponenial growth.

14 v 0 C S0 V=V 0 vCCCSvCCCSC Volume=V 14 1) Mass balance:

15 15

16 2) Rates: 3) Parameters: 16

17 1.) d(C C )/d(t)=-D*C C +(r g -r d ) 2.) d(C S )/d(t)=-D*(C S0 -C S )-Y sg *r g -m*C C 3.) d(C P )/d(t)=-D*C P +Y PC *r g 4.) rg=(((1-(C P /C pstar ))**0.52)*mumax*(C S /(K S +C S ))*C C 5.) D=0.2 6.) k d =0.01 7.) r d =k d *C C 8.) C S0 =250 9.) Y PC =5.6 10.) m=0.3 11.) mumax=0.33 12.) Y SC =12.5 13.) K S =1.7 17

18 1. Steady State - Neglect Death Rate and Cell Maintenance 2. Cell 18

19 3. Substrate 19

20 CSTR Washout C DWDW DC 20 Washout dilution rate

21 How does this figure relate to drinking a lot of fluids when you have an infection or cold? DC C DWDW D D maxprod 21

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