OP-II-3

OP-III-B-14aromatics (ca. 70 wt. %) but also contains alkenes and cycloalkanes. Coke is alsoformed on the catalytic surface, however the fraction of PyGas transformed into cokeis negligible. Based to our previous knowledge of the kinetic modeling ofhydroprocessing of model compounds, a kinetic scheme has been proposed(Figure 1) for the hidroprocessing of PyGas.Figure 1. The proponed kinetic scheme for PyGas hydroprocessing overPtPd/HZSM-5 catalyst.x iestimated (g i/g tot)0.60.40.2MethaneC 2+n-alkanesIsoalkanesCycloalkanesAromaticsOlefins0.00.0 0.2 0.4 0.6x iexperimental (g i/g tot)Figure 2. Parity diagram for theproposed kinetic model.We have observed that the increase ofP H2 and space time favors the crackingreactions and the hydrogenation of olefins.The temperature favors the C 2+ n-alkaneyield while diminishes the isoalkane yield.The parameter estimation has been done bymeans of an in-house written code based onthe Matlab's function lsqcurvefit using thelarge-scale algorithm. The good agreementbetween the estimated and experimentaldata is shown in Figure 2.References[1] C. Song, X. Ma, Appl. Catal., B: Environ. 41 (2003) 207.[2] R.G. Tailleur, J. Ravigli, S. Quenza, N. Valencia, Appl. Catal., A: Gen. 282 (2005) 227.[3] J. Weitkamp, A. Raichle, Y. Traa, Appl. Catal., A: Gen. 222 (2001) 277.[4] P. Castaño, J.M. Arandes, B. Pawelec, M. Olazar, J. Bilbao, Ind. Eng. Chem. Res. 47 (2008) 1043.[5] P. Castaño, A.G. Gayubo, B. Pawelec, J.L.G. Fierro, J.M. Arandes, Chem. Eng. J. 140 (2008) 287.[6] P. Castaño, B. Pawelec, J.L.G. Fierro, J.M. Arandes, J. Bilbao, Appl. Catal., A: Gen. 315 (2006) 101.208