Ethyl Corporation

Albemarle Corporation

William R Beard

Won S Park

Herbert M Scull

Noel H Brantley

Robin L Neil

A process for producing a tetrahydrocarbylaluminate is provided. This process comprises contacting sodium potassium alloy and a trihydrocarbylaluminum compound such that a tetrahydrocarbylaluminate is formed as a mixture of its sodium salt and potassium salt.

Preparation of aluminates

Dihydrocarbylamino metal compounds

The methylaluminoxane composition (MAOC) is a solid at 25&deg; C. that has a total aluminum content of about 39 to 47 wt %. The MAOC is either free of aluminum as trimethylaluminum (TMA) or if TMA is present, not more than about 30 mole % of the total aluminum in the MAOC is TMA. In the solid state the MAOC contains no more than about 2000 ppm (wt/wt) of aromatic hydrocarbon. The cryoscopic number average molecular weight of MAOC as determined in benzene is at least about 1000 amu, and the MAO has sufficient solubility in n-heptane at 25&deg; C. to provide a solution containing 4 to as high as 7.5 wt % or more of dissolved aluminum. By vacuum distilling a solution of ordinary MAO in aromatic hydrocarbon long enough under proper conditions, MOAC is formed.

Methylaluminoxane compositions, enriched solutions of such compositions, and the preparation thereof

A process for preparing a silane mixture of the formula

Process for preparation of organosilicon halides

Alkylaluminoxanes having 2 or more carbons in the alkyl group are reacted with a methyl halide using a bismuth containing catalysts to form methylaluminoxane by alkyl group exchange.

Process for preparing methylaluminoxanes

Trimethylaluminum is made by reacting a methyl halide with a tri-C.sub.2+ alkylaluminum, e.g. triethylaluminum, in the presence of a catalyst form by reacting bismuth metal with an alkylaluminum compound, e.g. trialkylaluminum, and an alkyl halide.

Trimethylaluminum process

Trimethylaluminum is made by gradually feeding a methyl halide to a reaction vessel containing a tri-C.sub.2+ alkylaluminum (e.g. triethylaluminum) and a catalyst formed from a bismuth compound and an alkyl or aryl organoaluminum compound thereby forming trimethylaluminum and C.sub.2+ alkyl halide and continuously distilling the C.sub.2+ alkyl halide, and any methyl halide that fails to react, from the reaction vessel thereby avoiding the accumulation of trialkylaluminum and alkyl halide which not only tends to form alkylaluminum halides but can be very hazardous on a large scale if a temperature excursion should occur.

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Baton Rouge, LA, United States of America

William R Beard