Application of a Kinetic Model for Catalytic Cracking. Some Correlations of Rate Constants

The catalytic cracking of a fischer‐tropsch synthesis product

“…I1 a aussi ftf montrt que le craquage des moltcules linfaires se produit probablement sur le premier site actif ti I'intkrieur d'un pore de zfolithe; il s'en suit que les produits formes sont presque'entierement compris dans la gamme C, B Clo et sont fortement isomfrists. he past record of the studies of catalytic cracking can T be divided in two: the study of pure compound cracking (Pachenkov and Kazanskaya, 1958;Voge, 1958;Good, Voge and Greensfelder, 1949;Greensfelder and Voge, 1945;Pickert et al, 1964;Miale, Chen and Weisz, 1966;Schulz and Geertsema, 1980;Corma and Lopez Agudo, 1982;Dimitrov, 1959;Venuto et al, 1966;Corma and Wojciechowski, 1982) and the study of gas oil cracking (Greensfelder, Voge and Good, 1949;Borodzinski, Corma and Wojciechowski, 1980;Walsh and Rollman, 1977;Appleby, Gibson and Good, 1962;Blue and Engle, 1951;Nace, Voltz and Weekman, 1971;Voltz , Nace and Weekman, 1971;Borodzinski, Corma and Wojciechowski, 1980;Pachovsky and Wojciechowski, 1975;Watson and Nelson, 1933). Here we report the cracking of a synthetic feedstock which falls neatly between these two categories.…”

Why FCC riser is taller than model predictions?

“…However, deviation was quite prominent in the inlet and exit regions. They used more rigorous fluid dynamic equations based on particulate phase fluctuating energy explained by Gidaspow,16 but took the simplest three-lump model proposed in a twin article by Weekman et al 17,18 Applying a conservative approach, Souza et al 11 considered 2-D flow with six lumps. However, the continuity and momentum equations were greatly simplified due to assumptions of incompressible homogeneous mixture with laminar flow.…”

Kinetic Analysis of Complex Reactions Using FEMLAB

“…Mobil scientists pioneered this research and proposed a lumped reaction network describing such processes that centers mainly on the interest of gasoline production [11,12]. It was believed that the coke produced during the cracking is the main cause of catalyst deactivation, and the gasoline yield is governed by the relative reaction rates in the parallel-serial reaction network as shown in Fig.…”

“…Again, the non-linear stiff problem solver fldaspak was used to ensure convergence. Simulation was conducted using typical process parameters obtained by experiment [11,12]. A feedstock P3 containing 46.2 wt % paraffin, 35.1 wt % naphthenes and 18.6 wt % aromatics gives kinetic rate constants k 1 = 28.0, k 2 = 1.86, k 3 = 6.0 and catalyst deactivation rate constant k d = 30.5, all with the unit of h ±1 (weight fraction ±1 ), in a Fluid Catalytic Cracker (FCC) operated at 482 C. Two catalyst residence times (t c = 1.25 and 5.0 min) were used for activity calculations.…”