Optimal process for catalytic cracking of higher olefins on ZSM-5

Sundberg, J.; Aretin, Tassilo von; Tonigold, Markus; Rehfeldt, Sebastian; Hinrichsen, Olaf; Klein, Harald

doi:10.1016/j.cej.2018.04.060

Cited by 20 publications

(8 citation statements)

References 32 publications

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“…But after 6 s, when the maximum value of 45.5 wt % is reached, the concentration of olefins decreases by cracking to lighter olefins (in the LPG and dry gas boiling point ranges), by later cyclization to aromatic hydrocarbons, and by their conversion into paraffins via hydrogen-transfer reactions. 47 However, the concentration of naphthenes in the naphtha lump slightly decreases over time from 7.2 to 2.3 wt % by their cracking to paraffins and olefins. The concentration of aromatics in the naphtha lump, in turn, significantly decreases from 57.5 to 27.6 wt % mainly due to the rise in condensation reactions which leads to the formation of coke and heavy aromatics in the LCO and HCO lumps.…”

Section: Methodsmentioning

confidence: 99%

Cracking of Scrap Tires Pyrolysis Oil in a Fluidized Bed Reactor under Catalytic Cracking Unit Conditions. Effects of Operating Conditions

et al. 2019

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Tire valorization by catalytic cracking of scrap tires pyrolysis oil has been investigated in a riser simulator reactor under fluid catalytic cracking (FCC) unit conditions using an equilibrated FCC catalyst. A parametric study has been done under testing conditions representative of an industrial unit. The extent of the reactions has been quantified by obtaining the yields of product lumps: dry gas, liquefied petroleum gases, naphtha, and light cycle oil. Moreover, a detailed composition of each lump has been obtained considering their chemical nature and number of carbon atoms. The obtained results expose the capacity of this unit for large-scale tire recycling.

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Section: Methodsmentioning

confidence: 99%

Cracking of Scrap Tires Pyrolysis Oil in a Fluidized Bed Reactor under Catalytic Cracking Unit Conditions. Effects of Operating Conditions

et al. 2019

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“…A helpful overview can be found in [3]. The conversion of higher olefins to mainly propene using a recycle reactor concept comparable to MTP is viable [161,162]; however, thus far, no commercial process has been achieved.…”

Section: Olefin Crackingmentioning

confidence: 99%

Kinetic Modeling of Catalytic Olefin Cracking and Methanol-to-Olefins (MTO) over Zeolites: A Review

Hinrichsen

2018

Catalysts

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The increasing demand for lower olefins requires new production routes besides steam cracking and fluid catalytic cracking (FCC). Furthermore, less energy consumption, more flexibility in feed and a higher influence on the product distribution are necessary. In this context, catalytic olefin cracking and methanol-to-olefins (MTO) gain in importance. Here, the undesired higher olefins can be catalytically converted and, for methanol, the possibility of a green synthesis route exists. Kinetic modeling of these processes is a helpful tool in understanding the reactivity and finding optimum operating points; however, it is also challenging because reaction networks for hydrocarbon interconversion are rather complex. This review analyzes different deterministic kinetic models published in the literature since 2000. After a presentation of the underlying chemistry and thermodynamics, the models are compared in terms of catalysts, reaction setups and operating conditions. Furthermore, the modeling methodology is shown; both lumped and microkinetic approaches can be found. Despite ZSM-5 being the most widely used catalyst for these processes, other catalysts such as SAPO-34, SAPO-18 and ZSM-23 are also discussed here. Finally, some general as well as reaction-specific recommendations for future work on modeling of complex reaction networks are given.

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“…Model-based process optimization can help to identify the potential for improvement, but for this at first, reliable models to describe the process are mandatory. Because of the large number of components involved and the complexity of the reaction mechanism, it remains challenging to establish reliable kinetic models suitable for process design of the MTP process. − The interconversion reactions of olefins on H-ZSM-5 are an important part of the reaction scheme of many petrochemical processes such as, for example, catalytic olefin cracking, which can be integrated in refineries, or the methanol to olefin/propylene or gasoline processes (MTO/MTP/MTG). ,− …”

Section: Introductionmentioning

confidence: 99%

Identification of Reaction Pathways and Kinetic Modeling of Olefin Interconversion over an H-ZSM-5 Catalyst

Warnecke

Lin

Haag

et al. 2020

Ind. Eng. Chem. Res.

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Kinetic investigations with a commercial H-ZSM-5 catalyst were performed to enable the modeling of the interconversion reactions of olefins in a temperature range from 420 to 490 °C. Different olefin feedstocks ranging from C2 up to C7 were investigated using a Berty-type reactor. Additional mixed olefin feedstock experiments were performed to obtain improved information about the bimolecular reaction pathways. The experiments include a wide range of conversions to cover the full range of typical industrial process conditions. The reaction pathways and the rate law approach of olefin cracking were analyzed systematically to identify a suitable and comprehensive model structure. A lumped kinetic model with 11 interconversion reactions based on a Langmuir–Hinshelwood–Hougen–Watson approach is found to be the best trade-off between accuracy and model complexity. The comparison between the model and experiments demonstrates that the kinetic model can predict the olefin behavior with a high accuracy for mixed as well as single olefin feedstock. A detailed kinetic model for the formation of side products has also been derived but will be discussed separately in another publication on hydrogen transfer on H-ZSM-5. Compared to existing kinetic models, the kinetic model proposed in this work shows distinct advantages because of the use of mixed feedstock, the widest range of conversions investigated so far, the use of a gradient-free and isothermal Berty-type reactor, and high-performance online gas chromatography analytics.

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Optimal process for catalytic cracking of higher olefins on ZSM-5

Cited by 20 publications

References 32 publications

Cracking of Scrap Tires Pyrolysis Oil in a Fluidized Bed Reactor under Catalytic Cracking Unit Conditions. Effects of Operating Conditions

Cracking of Scrap Tires Pyrolysis Oil in a Fluidized Bed Reactor under Catalytic Cracking Unit Conditions. Effects of Operating Conditions

Kinetic Modeling of Catalytic Olefin Cracking and Methanol-to-Olefins (MTO) over Zeolites: A Review

Identification of Reaction Pathways and Kinetic Modeling of Olefin Interconversion over an H-ZSM-5 Catalyst

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