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Home Forums CatCracking FCC Process MAPD Gas RE: MAPD Gas



MAPD is a thermally derived product.
Depending on the type of unit hardware there are several options:

In some circumstances ZSM-5 additivies have been observed to
decrease di-olefin production.

In addition, improved feed injector technology deployed during a TAR would
definitely be a positive improvement. This could be coupled with the
addition of additional feed injectors (redesign). This leads to improved
catalyst to oil contacting and quenching.

Adding dispersion steam or improving the feed dispersion of the feed injectors
(higher dP, more atomizing steam) can also improve the situation.

Lowering feed preheat temperature would lower the feed injection region temperature
reduing MAPD production. It would also increase cat-to-oil lowering regen temp which
again lowers reaction mix zone temperature. These also both lead to higher hydrogen
transfer mechanisms which reduce di-olefin production.

Also, we have seen salted or plugged feed injectors which when they have
been cleared have led to decreased MAPD production.

Finally, the use of a lighter feedstock (diesel or naphtha) as a reaction zone quench
or as lift gas technology would help.

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