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Home Forums CatCracking FCC Process MAPD Gas

This topic contains 1 reply, has 2 voices, and was last updated by  Anonymous 13 years, 2 months ago.

  • Author
  • #3102

    Ian Murray

    Does anyone have a successful path in controlling/manipulating MAPD Gas content in the PP olefin Stream?

  • #5984


    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.

    Need to discuss further?
    Calll me


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