Enichem S.p.a

Montedison S.p.a.

Consiglio Nazionale Delle Ricerche

Eniricerche S.p.a.

Giuseppe Braca

Glauco Sbrana

Stefano Pinori

Anna M Raspolli Galletti

Guglielmo Bertolini

Maurizio Brunelli

Guglielmo Gregorio

Aldo Giusti

Anna M Raspolli

Anna M Galletii

Franco Zanni

Alessandro Ricci

A catalyst active in the preparation of ethylene homo and copolymers consists of a nickel complex bound to a polystyrene support and definable by the general formula (I): ##STR1## in which Ph, m and n have the meaning given in the description. The catalyst preparation and its use in ethylene polymerization and ethylene copolymerization with other unsaturated monomers are described.

Nickel catalyst active in ethylene homo and copolymerization

A catalyst active in the polymerization of ethylene or the copolymerization of ethylene with unsaturated monomers consists of a nickel complex catalyst bonded to a polystyrene substrate, and definable by the general formula (I): ##STR1## where R, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 have the meanings given in the description. The preparation is described of the catalyst and its use in the polymerization of ethylene and the copolymerization of ethylene with other unsaturated monomers.

Polymerization catalyst, the process for its preparation and its use in

A process is described for producing ethyl acetate either alone or in mixture with acetic acid, by homologation of methyl acetate with CO and H.sub.2 in the presence of a catalyst in the form of a Ru compound and a catalysis promoter of hard acid type. The process has considerable advantages over known processes, in particular with regard to the reaction rate and the low formation of undesirable by-products.

Process for producing ethyl acetate by homologation of methyl acetate

A process is disclosed for preparing esters having the general formulae:

Process for preparing esters from ethers or esters of lower homologous

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Pisa, Italy

Giuseppe Braca