Multiple wye catalytic cracker and process for use

Details Multiple wye catalytic cracker and process for use Multiple wye catalytic cracker and process for use

C - Chemistry, Metallurgy

10

G

C10G 11/18 (2006.01) B01J 8/26 (2006.01)

Patent

CA 2078282

-14- ABSTRACT The conventional wye (where the clean regenerated catalyst returns from the regenerator to contact the feed as it enters the riser) is replaced with two or more wyes, all connected between the regenerator outlet and the inlet to a common short cracking riser. Each wye has a separate injector which can inject: e.g., diesel oil, so that neat (unmixed) diesel contacts clean catalyst and the mixture rises up a smaller riser before entering a short main riser where the largely cracked mixture is admixed with similar cat-vacuum bottoms, etc. mixtures from the other wyes. Most cracking occurs before entering the common riser so the effect is similar to a riser cracker operating on a single unmixed feed.

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