Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

OP-I-15products fraction, the latter effect being more evident for n-C16 than for n-C28, likely due tothe higher contribution of secondary cracking reactions; b) an increase of pressure alwaysdepressed conversion, without significant influence on product distribution in the case of n-C16, but with a lowering of the light fractions in the case of n-C28; c) an increase of H 2 /waxfeeding ratio slightly improved conversion with a small increase of the light products fraction.scheme:At first, kinetic modelling has been attempted by considering the following reactionn-Cx iso-Cx cracking productsBy using a simple PFR model with first order isomerisation reaction, apparent activationenergy values of 31.2 and 31.1 kcal/mol were obtained for n-C16 and n-C28, respectively.The reaction order with respect to H 2 was -0.54 in the case of n-C28, whereas for n-C16 a nonreliable value was obtained. Indeed, the assumption that H 2 partial pressure was equal to totalpressure was unacceptable at low pressure and a different approach is needed. Attention isnow focused on the development of a more detailed reaction scheme, aimed at designing atool to provide a reliable description of the behaviour of the two model compounds hereanalyzed and suitable to be extended to the interpretation of the hydrocracking of realfeedstocks.References1. B. Debrandere, G.F. Froment, in «Hydrotreatment and hydrocracking of oil fractions», G.B. Froment,B. Delmon, P. Grange, Eds., Elsevier B.V., Amsterdam, 1997, p. 379.2. H. Kumar, G.B. Froment, Ind. Eng. Chem. Res, 46 (2007) 4075.3. J.C. Chavarria, J. Ramirez, M.A. Baltanas, H. Gonzalez, Catal. Today, 98 (2004) 235.4. M.J. Girgis, Y.P. Tsao, Ind. Eng. Chem. Res., 35 (1996) 386.5. V. Calemma, S. Peratello, C. Perego, Appl. Catal. A: General, 190 (2000) 207.6. V. Calemma, S. Peratello, F. Stroppa, R. Giardino, C. Perego, Ind. Eng. Chem. Res., 43 (2004) 934.7. L. Pellegrini, S. Locatelli, S. Rasella, S. Bonomi, V. Calemma, Chem. Eng. Sci., 59 (2004) 4781.8. V. Calemma, C. Perego, P. Pollesel, L. Pellegrini, S. Correra, Catal. Today, 106 (2005) 282.55