Nova Patents
EP0405221A2

Alkylaluminoxane process.

Abstract

Alkylaluminoxanes are made in a continuous process by feeding an inert solvent solution of an alkyl aluminum compound and a water/inert solvent emulsion to a first reaction vessel maintained at -20 to 30°C and transferring reaction mixture to a second reaction zone at a rate which maintains a constant liquid level in the first reaction vessel and results in an average residence time of 1-60 minutes.

EP0405221A2, drawing sheet 1
Sheet 1 of 1

Term

Term ended

Projected expiry passed 12 June 2010, 16.3 years ago.

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8 claims: 4 independent, 4 dependent

  1. 1
    A continuous process for making an alkylalumin­oxane, said process comprising:(A) feeding a solution of an alkyl aluminum com­pound in an inert hydrocarbon solvent to a first reaction zone,(B) forming an emulsion of 0.5-10 weight percent water in an inert hydrocarbon solvent and feeding said emulsion to said first reaction zone, the ratio of moles of water to aluminum atoms being 0.4-1:1,(C) removing reaction mixture from said first reac­tion zone at a rate that maintains a constant liquid volume in said first reaction zone, further characterized in that the combined feed rate of said solution of an alkyl aluminum compound and said emulsion results in an average residence time in said first reaction zone of 1 to 60 minutes.
  2. 4
    A process of any of the preceding claims where­in said average residence time in said first reaction zone is 1-10 minutes.
  3. 5
    A process of any of the preceding claims where­in said aluminum alkyl is a tri-C₁₋₄ alkyl aluminum.
  4. 8
    A process of any of the preceding claims where­in said inert solvent is toluene.
Independent claims4