Gasoline demand is weakening as diesel becomes more widely used. At the same time, propylene demand is soaring and the steam cracking route is unable to keep up. In response, Shell Catalysts & Technologies has developed the MILO S (Middle distillate and Lower Olefins Selective) process.
The hardware is all proven, which makes it ideal for revamping an existing FCC. FCC technology from Shell Catalysts & Technologies includes a range of features, some of which are not available elsewhere.
Feed injection system
Proprietary side- and bottom-entry feed nozzles offer good riser coverage and mixing with the catalyst. This can result in higher gasoline yields, less dry gas, lower steam consumption and reduced pressure requirements.
Riser internals improves catalyst distribution and reduces spent catalyst reflux, which minimizes nonselective thermal cracking.
Close-coupled reactor cyclones with coke catcher
In addition to providing high separation efficiency, close-coupled cyclones minimize post-riser cracking and reactor vessel coking.
Proprietary PentaFlow stripper packing removes up to 95% of hydrocarbons. The relatively open design prevents plugging, enhances catalyst flux and facilitates access for maintenance.
Catalyst circulation enhancement technology
This improves circulation rates by up to 50% and is applicable to both the stripper and the regenerator standpipes; it improves stability and pressure build-up by optimizing the catalyst condition near the inlets.
Shell pioneered third-stage separator (TSS) technology and has installed more than 60 units over the past 50 years.