Process for the (co-)polymerisation of olefins

Patent metadata

Field	Value
Publication number	US-2016200837-A1
Application number	US-201414914281-A
Country	US
Kind code	A1
Filing date	Sep 3, 2014
Priority date	Sep 10, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present invention relates to a process for improving cleaning and/or drying of a polymerisation reactor by adding a compound that reacts with the catalyst poisons to scavenge it.

First claim

1 - 15 . (canceled)

16 . Process for the polymerisation or copolymerisation of olefins by bringing the said olefins into contact with a catalyst under polymerisation or copolymerisation conditions in a reactor comprising a charge powder, preferably an olefin polymer bed, which process comprises, prior to the introduction of the catalyst into the reactor, the introduction of a scavenger into the reactor which reacts with catalyst poison present, wherein the scavenger is added to the reactor until the charge powder comprises a remaining amount of scavenger comprised between 0.1 and 2.5 moles per ton of charge powder, preferably between 0.3 and 2 moles per ton of charge powder.

17 . Process for the polymerisation or copolymerisation of olefins by bringing the said olefins into contact with a catalyst under polymerisation or copolymerisation conditions in a reactor, which process comprises, prior to the introduction of the catalyst into the reactor, the introduction of a scavenger into the reactor which reacts with catalyst poison present, wherein the scavenger is added such that the level in the reactor of the product of decomposition of said scavenger and catalyst poison is controlled.

18 . Process for the polymerisation or copolymerisation of olefins by bringing the said olefins into contact with a catalyst under polymerisation or copolymerisation conditions in a reactor, which process comprises, prior to the introduction of the catalyst into the reactor, the introduction of a scavenger into the reactor which reacts with catalyst poison present, wherein the addition of the scavenger is performed as a series of sequential injections of scavenger, and said injections are continued until the increase in level in the reactor of the product of decomposition of said scavenger and catalyst poison during an individual addition of the scavenger is less than the expected amount of the product of decomposition corresponding to a complete reaction of all the scavenger added with poison.

19 . Process for the polymerisation or copolymerisation of olefins by bringing the said olefins into contact, under polymerisation or copolymerisation conditions in a reactor system, which process comprises, prior to the introduction of the catalytic system in the reactor system:
i) the introduction of a scavenger into the reactor system which reacts with the catalyst poison present, and ii) subsequently introducing a catalyst poison into the reactor system.

20 . Process according to claim 16 wherein the catalyst poison is water.

21 . Process according to claim 16 wherein the scavenger is selected from the group consisting of trialkyl metals (e.g. Triethylaluminium (TEA) and/or Triethylborane (TEB) and/or Triisobutylaluminium (TiBA)) and aluminoxanes (e.g. triisobutyl aluminoxane (TiBAO) and methylaluminoxanes (MMAO)), or mixtures thereof.

22 . Process according to claim 16 wherein the reactor is a gas phase reactor, preferably a fluidised bed gas phase reactor.

23 . Process according to claim 16 wherein a cocatalyst is used in combination with the catalyst, preferably an organometallic compound, for example an organoaluminium compound.

24 . Process according to claim 16 wherein the principal olefin is ethylene and/or propylene.

25 . Process according to claim 17 wherein the catalyst poison is water.

26 . Process according to claim 17 wherein the scavenger addition is performed after the introduction of the charge powder, preferably the olefin polymer charge powder, into the reactor.

27 . Process according to claim 17 wherein the remaining amount of scavenger (unreacted) is preferably comprised between 0.1 and 2.5 moles per ton of charge powder, more preferably between 0.3 and 2 moles per ton of charge powder.

28 . Process according to claim 17 wherein the scavenger is selected from the group consisting of trialkyl metals (e.g. Triethylaluminium (TEA) and/or Triethylborane (TEB) and/or Triisobutylaluminium (TiBA)) and aluminoxanes (e.g. triisobutyl aluminoxane (TiBAO) and methylaluminoxanes (MMAO)), or mixtures thereof.

29 . Process according to claim 17 wherein the reactor is a gas phase reactor, preferably a fluidised bed gas phase reactor.

30 . Process according to claim 17 wherein a cocatalyst is used in combination with the catalyst, preferably an organometallic compound, for example an organoaluminium compound.

31 . Process according to claim 17 wherein the principal olefin is ethylene and/or propylene.

32 . Process according to claim 18 wherein the catalyst poison is water.

33 . Process according to claim 18 wherein the scavenger addition is performed after the introduction of the charge powder, preferably the olefin polymer charge powder, into the reactor.

34 . Process according to claim 18 wherein the remaining amount of scavenger (unreacted) is preferably comprised between 0.1 and 2.5 moles per ton of charge powder, more preferably between 0.3 and 2 moles per ton of charge powder.

35 . Process according to claim 18 wherein the scavenger is selected from the group consisting of trialkyl metals (e.g. Triethylaluminium (TEA) and/or Triethylborane (TEB) and/or Triisobutylaluminium (TiBA)) and aluminoxanes (e.g. triisobutyl aluminoxane (TiBAO) and methylaluminoxanes (MMAO)), or mixtures thereof.

36 . Process according to claim 18 wherein the reactor is a gas phase reactor, preferably a fluidised bed gas phase reactor.

37 . Process according to claim 18 wherein a cocatalyst is used in combination with the catalyst, preferably an organometallic compound, for example an organoaluminium compound.

38 . Process according to claim 18 wherein the principal olefin is ethylene and/or propylene.

39 . Process according to claim 19 wherein the catalyst poison is water.

40 . Process according to claim 19 wherein the scavenger addition is performed after the introduction of the charge powder, preferably the olefin polymer charge powder, into the reactor.

41 . Process according to claim 19 wherein the remaining amount of scavenger (unreacted) is preferably comprised between 0.1 and 2.5 moles per ton of charge powder, more preferably between 0.3 and 2 moles per ton of charge powder.

42 . Process according to claim 19 wherein the scavenger is selected from the group consisting of trialkyl metals (e.g. Triethylaluminium (TEA) and/or Triethylborane (TEB) and/or Triisobutylaluminium (TiBA)) and aluminoxanes (e.g. triisobutyl aluminoxane (TiBAO) and methylaluminoxanes (MMAO)), or mixtures thereof.

43 . Process according to claim 19 wherein the reactor is a gas phase reactor, preferably a fluidised bed gas phase reactor.

44 . Process according to claim 19 wherein a cocatalyst is used in combination with the catalyst, preferably an organometallic compound, for example an organoaluminium compound.

45 . Process according to claim 19 wherein the principal olefin is ethylene and/or propylene.

Assignees

• Ineos Europe Ag

Inventors

• Desportes Serge
• Lalanne-Magne Claudine Viviane
• Viguier Renaud

Classifications

• C08F2/005 Primary

  by addition of a scale inhibitor to the polymerisation medium · CPC title

• C08F2/008 Primary

  cleaning reaction vessels using chemicals (mechanical methods B08B9/08) · CPC title

• C08F2410/02

  Anti-static agent incorporated into the catalyst · CPC title

• C08F10/06

  Propene · CPC title

• C08F10/02

  Ethene · CPC title