IMPROVED PROCESS FOR PRODUCING MIDDLE DISTILLATES BY OLIGOMERISATION OF AN OLEFINIC FEEDSTOCK

Abstract

The present invention relates to a process for preparing middle distillates from an olefinic feedstock, comprising: a) a step of oligomerisation, fed with the olefinic feedstock, a first recycled substance and a second recycled substance, and carried out in the presence of at least one oligomerisation catalyst, to produce a reaction effluent comprising dimers, trimers and oligomers; b) a step of fractionation of the reaction effluent to give: - a light fraction comprising at least part of the unconverted olefinic feedstock; - an intermediate fraction comprising at least part of the dimers and trimers; and - a heavy fraction comprising the oligomers; c) a recycling step, comprising preparing a first recycled substance comprising at least part of the light fraction and a second recycled substance comprising at least part of the intermediate fraction; and transferring the first recycled substance and the second recycled substance to step a); and d) a step of hydrogenation of at least part of the heavy fraction.

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