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Process for transitioning between incompatible catalysts

  • US 10,494,454 B2
  • Filed: 03/24/2016
  • Issued: 12/03/2019
  • Est. Priority Date: 03/24/2015
  • Status: Active Grant
First Claim
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1. A process for transitioning from a first continuous polymerization reaction, in a reactor, conducted in the presence of a first catalyst to a second continuous polymerization reaction in the reactor conducted in the presence of a second catalyst, wherein the first and second catalysts are incompatible, the process comprising:

  • (a) discontinuing the introduction of the first catalyst from a catalyst feeding system into a reactor and emptying the catalyst feeding system of the first catalyst;

    (b) introducing a first catalyst killer to the reactor to substantially deactivate the first catalyst in the reactor;

    (c) introducing a second catalyst killer to the catalyst feeding system to substantially deactivate the first catalyst in the catalyst feeding system;

    (c2) introducing a first portion of a second catalyst to the catalyst feeding system to remove any remaining second catalyst killer by the reaction of the second catalyst and the second catalyst killer;

    (c3) removing a reaction product from the reaction of the second catalyst with the second catalyst killer from the catalyst feeding system;

    (d) introducing a second portion of the second catalyst to the catalyst feeding system and(e) introducing the second catalyst to the reactor from the catalyst feeding system,wherein the second catalyst killer is the same as or different from the first catalyst killer.

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