Catalytic composition and a process for converting ethylene to light alpha olefins
AssigneeInstitut Francais du Petrole
InventorsDominique Commereuc, Serge Boivineau, Fran.cedilla.ois Hugues, Lucien Saussine
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Abstract
A catalytic composition for the production of light alpha olefins by ethylene oligomerisation is produced by mixing a zirconium compound with an organic compound selected from the group formed by acetals and ketals, with an aluminium hydrocarbyl compound selected from the group formed by chlorine-containing or bromine-containing aluminium hydrocarbyl compounds and with an aluminium hydrocarbyl compound selected from tris-(hydrocarbyl)-aluminium compounds. Addition of a tris-(hydrocarbyl)-aluminium compound greatly increases the activity. A process for producing light alpha olefins by ethylene oligomerisation is also claimed.
Claims19
An improved catalytic composition, characterized in that said improved catalytic composition is obtained by mixing:
- at least one zirconium compound with formula ZrX.sub.x Y.sub.y O.sub.z, where X is a chlorine or bromine atom, Y is a radical selected from the group consisting of alkoxy RO.sup.-, amido R.sub.2 N.sup.-, and carboxylate RCOO.sup.- groups, where R is a hydrocarbyl radical containing 1 to 30 carbon atoms, x and y have whole number values of 0 to 4 and z is equal to 0 or 0.5, the sum x+y+2z being equal to 4;
- with at least one organic compound with formula (R.sub.1 ')(R.sub.2 ')C(OR.sub.1)(OR.sub.2) where R.sub.1 ' and R.sub.2 ' are constituted by a hydrogen atom or a hydrocarbyl radical containing 1 to 30 carbon atoms, R.sub.1 and R.sub.2 being hydrocarbyl radicals containing 1 to 30 carbon atoms;
- with at least one aluminium compound with formula AlR".sub.n X.sub.3-n where R" is a hydrocarbyl radical containing 1 to 6 carbon atoms, X is a chlorine or bromine atom, and n is a number in the range 1 to 2;
- and with at least one trishydrocarbyl aluminium compound with formula AlR'".sub.3 where R'" is a hydrocarbyl radical containing 1 to 6 carbon atoms.
Dependencies are inferred from the claim text.