METHOD FOR THE ISOLATION OF OLEFIN OLIGOMERIZATION PRODUCTS AND THE DECOMPOSITION OF OLIGOMERIZATION CATALYST RESIDUES

The invention relates to the field of production of olefin oligomers, which are widely used as copolymers, a raw material for the preparation of oils and lubricants, and also a raw material for producing other chemical products. The invention relates to the production of olefin oligomers by a method of oligomerization of olefins, and, in particular, to a method of isolating olefin oligomerization products and decomposing the oligomerization catalyst residues. The method of isolating products of an oligomerization reaction of olefins comprising a terminal double bond, wherein the reaction is carried out by the action of a catalyst comprising chromium compounds, a nitrogen-containing ligand and organoaluminum compounds, comprises a step of isolating independent olefin products and a step of treating catalyst residues, characterized in that the method comprises the following sequential steps: a) isolating at least one liquid product of the oligomerization reaction of olefins from an output stream of an oligomerization reactor; b) treating a residue with an aqueous solution of an acid; and c) separating an organic layer and an aqueous layer. Firstly, the use of the proposed methods allows the isolation of target reaction products, avoiding the ingress of impurities of foreign substances, such as alcohols into products and/or recurrent solvent, and elimination of the necessity of the separation of these foreign substances. Secondly, the use of the proposed method makes it possible to avoid the contamination of tubing and devices between the reactor and the distillation column with a side product. Thirdly, the solution makes it possible separating catalyst residues from a polymer by-product, thereby facilitating the regeneration of the catalyst or separation of metal compounds from catalyst residues, while avoiding the precipitation of a resin during the distillation of the high-boiling reaction products.