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By Blodgett K.B.

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Description: Catalytic and selective cracking in a short-contact-time riser (1) where oil feed is effectively dispersed and vaporized through a proprietary feed injection system. Operation is carried out at a temperature consistent with targeted yields. Reaction products exit the riser-reactor through a high-efficiency, proprietary riser termination device (2). Spent catalyst that has not been cooled is pre-stripped and back to main menu flows through a rapid preliminary stripping section, followed by a high-efficiency baffled stripper prior to regeneration.

The circulation of hot catalyst (7) from the upper section to the combustor provides added control over the burn-zone temperature and kinetics and enhances radial mixing. Catalyst coolers (8) can be added to new and existing units to reduce catalyst temperature and increase unit flexibility for commercial operations of feeds up to 6 wt% Conradson carbon. For heavier resid feeds, the two-stage regenerator is used. In the first stage, upper zone (9), the bulk of the carbon is burned from the catalyst, forming a mixture of CO and CO2.

Products: Deep catalytic cracking Application: Selective conversion of gas oil and paraffinic residual feedstocks. Products: C2–C5 olefins, aromatic rich, high octane gasoline and distillate. Description: DCC is a fluidized process for selectively cracking a wide variety of feedstocks to light olefins. Propylene yields over 24 wt% are achievable with paraffinic feeds. A traditional reactor/regenerator unit design uses a catalyst with physical properties similar to traditional FCC catalyst. The DCC unit may be operated in two operational modes: maximum propylene (Type I) or maximum iso-olefins (Type II).

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