Semibatch catalytic cracking

Although a wide variety of catalysts have been employed to crack PE, zeolites have proven particularly effective. For example, Garforth et al. reported that activation energies (La) measured when PE was catalytically cracked by HZSM-5, HY, and MCM-41 were much lower than when no catalyst was present. [66] They concluded that HZSM-5 and HY have similar activities and that both of these zeolites were more effective than MCM-41. Manos and co-workers found that catalytic cracking of PE by HZSM-5 and HY was effective in producing gasoline size hydrocarbons in a laboratory semibatch reactor [67, 68]. Mordi and co-workers reported that H-Theta-1 and H-Mordenite... 

S. C. Cardona and A. Corma, Tertiary recycling of polypropylene by catalytic cracking in a semibatch stirred reactor. Use of spent equilibrium FCC commercial catalyst, Appl. Catal. B Env., 25, 151 (2000). 

S. C. Cardana. and A. Corma, Kinetic stndy of the catalytic cracking of polypropylene in a semibatch stirred reactor, Catal. Today, 75, 239 (2002). 

The large spectrum of reactors is shown in Fig. 2 with the vertical axis showing the progression from the simplest types such as a delayed coker (a semibatch reactor) to the highly complex fluid catalytic cracking (FCC) unit, which has both the reaction phase and the catalyst being transported through the reactor. 

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