Catalytic+Cracking

=Catalytic Cracking + Recorded lesson=

__2. identify the industrial source of ethylene from the cracking of some of the fractions from the refining of petroleum__

Catalytic cracking is the process in which high molecular weight (high boiling point) fractions from crude oil are broken into lower molecular weight substances in order to increase the output of high-demand products.

This reaction usually occurs in a column called a cat cracker. Alkanes with 15 to 25 carbon atoms per molecule are broken into two smaller molecules, one an alk__**ane**__ and the other an alk__**ene.**__

A good example:

Pentadecane --> Decane + Pentene or **C**15**H**32-->**C**10**H**22 + **C**5**H**10

These can be broken down further into smaller substances.

The catalyst used for cracking alkanes are inorganic compounds called __**zeolites.**__ They are crystalline, aluminosilicates (compounds of aluminium, silicon and oxygen with some metal ions attached.) The reaction is typically held at __**500 degrees**__ with an absence of air with pressures higher than one atmosphere.

Hey guys, sorry but i thought i could split up the lesson and get it all on wikispaces but didn't work so here are 4 parts to this lesson

wont do it in future :)

Part 1 http://www.mediafire.com/?2phjrp9urovwnqn Part 2 http://www.mediafire.com/?8rn66qgfabclgfq Part 3 http://www.mediafire.com/?1cki2z54k7id7u2 Part 4 http://www.mediafire.com/?apdrbkmi9bf619c

Youtube clip:

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