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Parameter Estimation for a Chemical Reaction

Introduction

This application estimates the rate parameters for a reversible reaction with dimerization of an intermediate.

A+B k__2k__1 C

C+Ck__4k__3D

It does this by doing the following:

Parameterizing (with respect to k__1,k__2,k__3 and k__4) the numerical solution of the different equations that describe the reaction kinetics

Calculating the sum of the square of the errors between the model predictions and experimental data

Minimizing the sum of the square of the errors to find the best fit values of k__1,k__2,k__3 and k__4

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restart:withplots:withOptimization:

Parameters and Experimental Data

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A__02.1: B__03.1:

Concentrations of C and D over time

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times07142128354249566370:

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C_exp01.0651.3830.97931.1070.72890.72360.46740.60310.61490.3369:

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D_exp00.00580.22030.40190.36380.4560.50140.7150.47230.72190.7294:

Reaction Kinetics

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de1ⅆⅆtC__Ct=k__1A__0C__Ct2 C__DtB__0C__Ct2C__Dtk__2C__Ct2k__3C__Ct2+2k__4C__Dt:

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de2ⅆⅆtC__Dt=k__3C__Ct2k__4C__Dt:

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icC__C0=0,C__D0=0:

Sum of Square of Errors

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resdsolvede1,de2,ic,parameters=k__1,k__2,k__3,k__4,numeric:

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sseprock__1,k__2,k__3,k__4 local i; resparameters=k__1,k__2,k__3,k__4: addC_expirhsselecthas,restimesi,C__C2+D_expirhsselecthas,restimesi,C__D2, i=1 .. numelemstimes end proc:

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sse0.01,0.002,0.02,0.002

2.00578059621453

(4.1)

Minimize the Sum of the Square of the Errors

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optParsMinimize'sse'k__1,k__2,k__3,k__4,initialpoint=k__1=0.011 ,k__2=0.002,k__3=0.02,k__4=0.002,assume=nonnegative,optimalitytolerance=0.00001

optPars0.231411169620961532,k__1=0.0632294154111440,k__2=0.0186953983808340,k__3=0.0144413290425876,k__4=0.

(5.1)

Compare Experimental Results to Model

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resdsolvede1,de2,ic,parameters=k__1,k__2,k__3,k__4,numeric:

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resparameters=optPars2:

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p_Codeplotres,t,C__Ct,t=0..70,color=ColorTools:-Color149255,165255,166255,legend=C,filled=true:

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p_C_expplottimes,C_exp,style=point,symbol=solidcircle,symbolsize=20,color=ColorTools:-Color149255,165255,166255:

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p_Dodeplotres,t,C__Dt,t=0..70,color=ColorTools:-Color58255,83255,155255,legend=D:

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p_D_expplottimes,D_exp,style=point,symbol=solidcircle,symbolsize=20,color=ColorTools:-Color58255,83255,155255:

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displayp_C,p_C_exp,p_D,p_D_exp,symbol=solidcircle,size=800,400,axesfont=Calibri,legendstyle=font=Calibri,labels=Time,Concentration,labelfont=Calibri,labeldirections=horizontal,vertical,gridlines

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