CATALYTIC SYSTEM FOR DIMERIZATION OF ETHYLENE AND METHOD FOR DIMERIZATION OF ETHYLENE TO 1-BUTENE Russian patent published in 2007 - IPC C08F4/642 C07C2/06 C07C11/08 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for synthesis of olefins, namely, 1-butene of polymerization purity by a method of catalytic dimerization of ethylene. Invention describes the catalytic system for dimerization of ethylene to 1-butene based on titanium alcoholate of the general formula: Ti(OR)₄ wherein R means (C₂-C₆), aluminum trialkyl of the general formula: AlR₃ wherein R means (C₂-C₆) and ester chosen from group comprising tetrahydrofuran, dioxane or their mixture and wherein the mole ratio of ester to titanium alcoholate = (0.1-0.49):1 and that of aluminum trialkyl to tetraalkoxy-titanium = (2.6-6):1. Also, invention describes a method for dimerization of ethylene to 1-butene in hydrocarbon solvent medium at temperature 50-95°C and under ethylene pressure 0.3-0.4.0 MPa in the presence of the catalytic system. Invention provides enhancing selectivity of process, increasing yield of 1-butene as measured per unit of catalyst, reducing possibility for carrying out by-side reactions, such as polymer synthesis, isomerization of 1-butene to 2-butene and formation of butanes.

EFFECT: improved method of dimerization, valuable properties of catalytic system.

6 cl, 3 tbl, 12 ex