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AssigneeInstitut Francais du Petrole
InventorsDominique Commereuc, Alain Forestiere, François Hugues, Hélène Olivier-Bourbigou
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A process is described for carrying out olefin oligomerisation in two catalysis steps of different types, using an organic feed containing at least one olefin. The cut to be treated, containing at least one olefin (Cn), is introduced into a first reaction zone where, in a first step, it undergoes catalytic oligomerisation either of the homogeneous liquid phase type, or of the heterogeneous type with a solid support. The effluent produced is generally sent to a heat exchanger traversed by a cold liquid, the effluent thus being cooled before being sent to a second reaction zone where it undergoes catalytic oligomerisation in a liquid—liquid two-phase medium, the invention being characterized in that at least an ethylenic hydrocarbon containing 3 to 5 carbon atoms per molecule is added to the inlet to the second reaction zone.
A process for carrying out a dimerisation, co-dimerisation or oligomerisation reaction on an organic feed containing at least one olefin, comprising at least two successive catalysis steps of different types, the first step comprising contacting the feed under homogeneous or heterogeneous catalysis conditions and the second step comprising oligomerizing at least a portion of the resultant effluent from the first step in the presence of at least one catalytic element in a liquid—liquid two-phase medium containing an organic phase and a medium with an ionic nature that is not or is only slightly miscible with the organic phase, the feed to be treated containing at least one olefin the chain of which contains two to six carbon atoms or a mixture of said olefins, the process being characterized in that at least one olefin selected from the group consisting of C3, C4 and C5 olefins is added at the beginning of the second step.
Dependencies are inferred from the claim text.