Kinetics of Noncatalytic Hydrocracking

FIGURE 6.15 General reaction network for catalytic hydrocracking of heavy oils. 

Tn = k yvR + hyvoo + sTmd loTiv rg = k4yvR + kjyvGo + KyMo + h yN 

The inlet and outlet compositions in the reactor were calculated considering the following equation  

The kinetic model was incorporated to the following reactor model and was solved using the Runge-Kutta method  

It was assumed that mass transfer limitations are not present due to the absence of catalysts and that the reactor behaves as a plug-flow reactor. A sequential method for determining the parameter values was employed, which is reported elsewhere (Ancheyta and Sotelo, 2000). The minimization of the objective function, based on the sum of square errors between the experimental and calculated product compositions, was applied to And the best set of kinetic parameters. This objective function was solved using the least-squares criterion with a nonlinear regression procedure based on Marquardt s algorithm. 

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