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Pyrolysis of cracked gasoline into olefins: I. design and construction of a cold model for circulating type reactor

Abstract:

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 gas-solid 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. © 2010 American Chemical Society.