501 South Main St. Galena Park, TX 77547

Process Unit Description Unit Fluid Catalytic Cracking Unit (inc. Gas Con & Treating) Equip. No. Series 7000/7070/7100/7450 7460/7500/7550/7570 7590 Design Capacity 80000 bpd Year Built 1993 Typ. Capacity 150000 bpd Licensor UOP Last Major T/A 2010 The FCCU is a side by side reactor / regenerator design. The reactor is fitted with UOP’s proprietary riser termination hardware and close coupled cyclones. The riser also features UOP’s lift gas technology. The regenerator is a combustor design and is fitted with two back mix catalyst coolers to enable effective residue cracking capability. Reactor / Regenerator / Flue Gas / Main Fractionator Sections Feed is pumped from the feed drum through the preheat exchanger train where Main Fractionator product and pump around streams heat up the feed. The heated feed is sprayed into the riser reactor through the injector nozzles where it is mixed with lift gas and hot regenerated catalyst. The oil / catalyst mixture flows up the riser with the heavier oils cracking into lighter components. At the riser termination the catalyst and oil are separated through a cyclone system. The oil vapors continue out of the reactor to the Main Fractionator. The catalyst now in its spent form and coated with carbon is gravity fed through a catalyst stripper where a counter current flow of steam strips any entrained and absorbed hydrocarbon from the spent catalyst. The stripped spent catalyst flows down the spent standpipe where it enters the lower, or combustor, section of the catalyst regenerator. Here air supplied by a turbine driven air blower is blown through the hot spent catalyst. The carbon on the catalyst combusts generating significant heat. The catalyst is blown up through the combustor through a disengaging riser into the upper regenerator. The upper regenerator serves as a reservoir for the hot regenerated catalyst. Some of the regenerated catalyst circulates through the catalyst coolers generating 600 psig steam, while the rest returns to the base of the riser reactor. There are three storage vessels associated with the catalyst system. One for fresh catalyst, one for purchased equilibrium catalyst and one for used catalyst for disposal. Flue gas from the combustion of the catalyst exits the upper regenerator through a two stage cyclone system before entering the external third and fourth stage separator vessels. The hot flue gas then enters the flue gas expander which is a single stage turbine connected to a power generator. The expander is rated for 25 MW of power. The still hot expanded flue gas then flows through two parallel waste heat boilers superheating 600 psig steam from the slurry pump around boilers and catalyst coolers before generating 600 psig then 50 psig steam. Cooled flue gas is then routed to a gas scrubber where a weak alkaline circulating solution contacts the flue gas to remove sulfur dioxide and some nitrogen oxides. From the scrubber the flue gas exits to atmosphere.