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

The invention relates to the field of producing olefin oligomers which are widely used as copolymers, raw materials for oils and lubricants and raw materials for the production of other chemical compounds. The invention relates to the production of olefin oligomers by means of olefin oligomerization and, in particular, to a method for the isolation of olefin oligomerization products and the decomposition of oligomerization catalyst residues. The method for isolating reaction products of the oligomerization of olefins having a terminal double bond, which is carried out over a catalyst comprising chrome compounds, nitrogen-containing ligands and organoaluminum compounds and includes a phase in which individual olefin products are isolated and a phase in which catalyst resides are processed, is characterized by the following three consecutive operations: a) at least one liquid product of an olefin oligomerization reaction is isolated from the flow exiting the oligomerization reactor; b) the residue is processed using an aqueous acidic solution; c) an organic layer and an aqueous layer are separated. Use of the proposed method makes it possible, first of all, to isolate specific reaction products, thus preventing the introduction of foreign substances, such as alcohols, into the products and/or the return solvent, and eliminates the need for the separation of these contaminants. Secondly, use of the proposed method makes it possible to prevent the contamination of lines and devices between the reactor and the distillation column by the by-product polymer. Thirdly, the method makes it possible to separate catalyst residues from the by-product polymer, which facilitates catalyst regeneration or the isolation of metal compounds from the catalyst residues, while at the same time avoiding resin sedimentation during the distillation of high-boiling-point reaction products.