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1 The introduction of catalytic cracking ! on Sat Jan 03, 2015 9:41 am


Thành Viên OGC
Thành Viên OGC
FCC - Fluid Catalytic Cracking.

The catalyst is characterized the FCC, it is kind of particles  ( 40~ 80 micrometer in diameter ) which are aerated with air ( with a pump) go into the regenerator chamber. The aerated catalytic  particles act like a liquid flow together with the fresh feed. Note that, in the regenerator the temperature is 512 celsius degrees and the hydrocarbon fresh feed ( feedstock of FCC ) is vaporized. Economically, no need to provide a heat exchanger ( evaporator ) to vaporize the fresh feed. The fresh feed + catalytic fluid flow into the reactor, there the catalytic cracking reactions happens. The residence time is about 2 seconds with sufficient conditions allow the reactions occur such as temperature, pressures... Then the spent catalysts and cracked products vapor are seperated by a cyclone separator which is located on the top of the reactor. The cracked products go into the fractionator ( distillation column ) and the spent catalysts go to the regenerator from the bottom of the reactor. In the regenerator, the catalyst is burning with air to remove coke formation at the catalyst surface and start a new cycle with a new fresh feed together with some residue from the fractionator.
The catalytic cracking is ion carbocation mechanism and  differs from thermal and steam cracking which is free radical mechanism.
The enclosure below is the pptx file I used to present in a SPE dicussion. For more information please discuss with me through my email address [You must be registered and logged in to see this link.].
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