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A typical fluid catalytic cracking unit in a petroleum refinery. Fluid catalytic cracking (FCC) is the conversion process used in petroleum refineries to convert the high-boiling point, high-molecular weight hydrocarbon fractions of petroleum (crude oils) into gasoline, alkene gases, and other petroleum products.
A large vapor cloud formed and traveled downwind about 640 feet (200 m) to the fluid catalytic cracking (FCC) unit, where ignition occurred. A control building, the alkylation unit, the FCC unit, and the carbon monoxide boiler sustained heavy damage. Windows were broken up to 1.5 miles (2.4 km) away.
Fluid catalytic cracking is a commonly used process, and a modern oil refinery will typically include a cat cracker, particularly at refineries in the US, due to the high demand for gasoline. [10] [11] [12] The process was first used around 1942 and employs a powdered catalyst. During WWII, the Allied Forces had plentiful supplies of the ...
In short, the alky produces a high-quality gasoline blending stock by combining two shorter hydrocarbon molecules into one longer chain gasoline-range molecule by mixing isobutane with a light olefin such as propylene or butylene from the refinery's fluid catalytic cracking unit (FCCU) in the presence of an acid catalyst. [2] [3]
A schematic diagram of the power recovery system in a fluid catalytic cracking unit. The combustion flue gas from the catalyst regenerator of a fluid catalytic cracker is at a temperature of about 715 °C and at a pressure of about 2.4 barg (240 kPa gauge).
The first large scale commercial implementation, in the early 1940s, was the fluid catalytic cracking (FCC) process, [1] which converted heavier petroleum cuts into gasoline. Carbon-rich "coke" deposits on the catalyst particles and deactivates the catalyst in less than 1 second.
Catalytic cracking, coking and other such conversion units are referred to as secondary processing units. The Nelson Complexity Index, captures the proportion of the secondary conversion unit capacities relative to the primary distillation or topping capacity. The Nelson Complexity Index typically varies from about 2 for hydroskimming ...
Naphtha, natural gas, refinery off-gas and gas from cokers and thermal crackers are good sources. Thus natural gas is one of the most wanted feed stocks for petrochemicals production. The thermal cracking of natural gas proceeds at very high temperature resulting in olefins (Mostly ethylene/propylene). The temperature in a gas cracker exceeds ...