Exxon Flexicracker

The latest model is known as Exxon Flexicracker (Figure 22) (56). In this model, the U-tubes are replaced by a standpipe that is followed by upwardly sloped laterals, referred to as J-bends. This model takes advantage of riser cracking and spent catalyst in the J-tube is controlled by a slide valve. Reactor temperature is controlled by pressure differential between the regenerator and reactor. 

Figure 22. Exxon Flexicracker. (Reproduced with permission from reference 56. Copyright 1996.)...

Flexicracking A version of the FCC process developed by Exxon Research Engineering Company. Seventeen units were operating in 1996. 

In 1979, Exxon built its first Flexicracker which is a side-by-side configured FCC unit with an elevated reactor vessel. This unit contained a straight external vertical riser terminating in a proprietary separation system. 

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