Modeling the thermal cracking of ethane and propane in a non-isothermal vertical pneumatic transport reactor

Koyama, Hiroki; Dranoff, Joshua S.

doi:10.1021/ie00010a002

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…The cyclone type reactor appears ideal for effecting these ultrafast chemical reactions coupled with separation. The technology was used for ablative pyrolysis of biomass and important simulation information has recently been developed for this purpose. (Review in Houard et al 2010) …”

Section: Resultsmentioning

confidence: 99%

Pyrolysis of Cracked Gasoline into Olefins: I. Design and Construction of a Cold Model for Circulating Type Reactor

Freitez

Galiasso

González

et al. 2010

Ind. Eng. Chem. Res.

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A new concept of reactor-a prototype of transported-loop reactor that reduces residence time for the cracking of a light naphtha stream-enhances commercial, low-value, light streams with an alternative process to applying these fractions to light olefins (ethylene and propylene). In particular, a prototype of a transported-loop reactor was developed to reduce the resistance time in the cracking of a light naphtha stream to produce olefins. In particular, a prototype of a transported-loop reactor has been developed to reduce resistance time in the cracking of a light naphtha stream to produce olefins. It is currently used to study the gassolid fluid-dynamic. The novel device includes a uniflow-type reactor and a partial gasification downer riser circulating reactor. The novelty lies in converting the light naphtha at a very high temperature and ultrashort residence time by contacting a hot solid with the naphtha to immediately separate the olefins to avoid further reactions. The solid is then partially gasified to provide autothermal operation of the reactors. The design of the equipment provides information about the gas/solid contact to develop several prototypes of the pyrolysis and the carbon gasification reactor. The cold model will derive suitable hydrodynamic relationships and performance constraints for high solid loading not available in the literature. The main result obtained is the need to provide an initial high solid contact to ensure the heat transfer and then proceed to separate the gas and solid. The other result is the effect of the hydrocyclone in the clustering behavior of the circulation reactor. Knowledge of the fluid dynamic in both reactors and kinetic information already developed will facilitate design and scale-up of a new process for cracked naphtha valorization.

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Section: Resultsmentioning

confidence: 99%

Pyrolysis of Cracked Gasoline into Olefins: I. Design and Construction of a Cold Model for Circulating Type Reactor

Freitez

Galiasso

González

et al. 2010

Ind. Eng. Chem. Res.

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“…One of the most interesting applications is related to steam cracking technology (Berg et al, 1989;Koyama et al,, 1992). The unit consists of two risers (reactor and combustor) operating at different conditions (gas velocity, pressure), which exchange a solid stream through downcomers and feeders.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic model for short contact time circulating fluidized bed

Tinaburri¹

1996

AIChE Journal

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Hydrodynamics of circulating fluidized bed risers: A review

et al. 1995

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Any vessel in which solids are transported upward by a gas stream and then recycled to the bottom may be classified as a Circulating Fluidized Bed (CFB). We describe possible CFB operating regimes in the context of this broad classification and highlight commercial processes that employ CFB technology and potential applications. Process design and development require a fundamental understanding of gas and solids hydrodynamicssolids hold-up, mixing and velocity distribution. We discuss techniques used to measure solids mass flux, which is a critical parameter for both design and control. In the last decade, significant research efforts have been devoted to new experimental techniques to measure both gas and solids spatial and temporal distribution. We list these techniques and detail the different modelling approaches that have emerged based on the new data. Characterization of the data is still incomplete and the available models require further refinement to reliably predict the effect of scale, operating conditions and particle characteristics on hydrodynamics. N'importe quel contenant dans lequel des particules sont emportks dans la direction ascendante par un courant gazeux puis recyclkes par le bas peut Stre class6 c o m e un Lit Fluidisk Circulant (LFC). Nous dkrivons les rkgimes possibles des op6rations dans ces LFC en tenant compte de cette dkfinition ktendue et les prockddcs industriels existants et potentiels qui utilisent cette technologie des LFC. La conception et le dkveloppement des proctklks exigent une comprkhension fondamentale des hydrodynamics du gaz et des particulesrktention de solides, degrk de mklange et distribution des vitesses. Nous discutons les diffkrentes techniques utiliskes pour mesurer le taux de circulation de solide qui est un paramttre critique pour aussi bien le design que le contr6le. Durant le dernitres mks, un effort significatif'de recherche a kt6 consenti au dkveloppement de nouvelles techniques exp6rimentales pour mesurer les distributions temporelle et spatiale des diffkrentes caractkristiques du gaz et du solide. Nous reportons ces techniques et nous dktaillons le diffkrentes approches de modklisation qui ont kt6 introduites en se basant sur ces nouvelles donnks.La caradrisation de ces donnks est encore incompltte et les modkles existants doivent Stre encore raflids afin de pddire ad6quatement les effets d'khelle, des conditions @ratoires et des mactkristiques des particules sur I'hydrodynamique.

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Modeling the thermal cracking of ethane and propane in a non-isothermal vertical pneumatic transport reactor

Cited by 8 publications

References 11 publications

Pyrolysis of Cracked Gasoline into Olefins: I. Design and Construction of a Cold Model for Circulating Type Reactor

Pyrolysis of Cracked Gasoline into Olefins: I. Design and Construction of a Cold Model for Circulating Type Reactor

Hydrodynamic model for short contact time circulating fluidized bed

Hydrodynamics of circulating fluidized bed risers: A review

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