Difference between revisions of "'''1. What is FCC?'''"

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The fluid catalytic cracking (FCC) unit converts low-value heavy hydrocarbons into a series of more valuable products such as gasoline and light olefinic compounds. Higher selectivity to these intermediate products is more desirable for FCC reactor performance.
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== Background ==
  
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FCC is a substance that increases the rate of a chemical reaction by reducing the activation energy and is often used in oil refinery process for the rupture of high molecular weight hydrocarbon chains, a process needed to optimize the proportion of gasoline produced.
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The process of the FCC unit consists of the feed injection system, riser, riser outlet separator system, disengager/stripper, regenerator, catalyst cooler (optional), catalyst withdrawal well, catalyst transfer lines, and control systems.
  
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FCC particles, which are designed for a fluidized bed, are a well-known example of a composite catalyst; and the situation encountered can be considered representative
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[[File:FCCdiagram.png|700px|thumb|centre|alt text]]
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The feed mixture is pumped to the base of the riser and divided into equal flows, to each of the feed nozzles. The feed, which has been preheated, is finely atomized and mixed with dispersion steam in the feed nozzles and injected into the riser. The small droplets of feed contact hot regenerated catalyst in a counter-current way and vaporize immediately. The vaporized oil intimately mixes with the catalyst particles and cracks into lighter, more valuable products along with slurry oil, coke, and gas. The product vapors travel up the riser while carrying the catalyst. Residence time in the riser is approximately 2 seconds at design conditions. The specially designed feed injection system ensures the reaction is carried out efficiently to minimize the production of coke, gas, and slurry oil.
  
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please see the link below for a full explanation
  
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[[File:FCCdiagram.png|700px|thumb|centre|alt text]]
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http://air.eng.ui.ac.id/index.php?title=Fluid_catalytic_cracking_Plant

Latest revision as of 13:16, 8 December 2020

Background

The process of the FCC unit consists of the feed injection system, riser, riser outlet separator system, disengager/stripper, regenerator, catalyst cooler (optional), catalyst withdrawal well, catalyst transfer lines, and control systems.

alt text


The feed mixture is pumped to the base of the riser and divided into equal flows, to each of the feed nozzles. The feed, which has been preheated, is finely atomized and mixed with dispersion steam in the feed nozzles and injected into the riser. The small droplets of feed contact hot regenerated catalyst in a counter-current way and vaporize immediately. The vaporized oil intimately mixes with the catalyst particles and cracks into lighter, more valuable products along with slurry oil, coke, and gas. The product vapors travel up the riser while carrying the catalyst. Residence time in the riser is approximately 2 seconds at design conditions. The specially designed feed injection system ensures the reaction is carried out efficiently to minimize the production of coke, gas, and slurry oil.

please see the link below for a full explanation 

http://air.eng.ui.ac.id/index.php?title=Fluid_catalytic_cracking_Plant
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