METHOD OF OBTAINING LINEAR ALPHA-OLEFINS Russian patent published in 2009 - IPC C07C2/32 C08F4/70 C08F10/02 B01J31/14 

FIELD: chemistry.

SUBSTANCE: invention concerns method of obtaining alpha-olefins, involving reaction of ethylene during oligomerisation in the presence of catalytic system obtained by mixing in situ of: metal salt based on Fe(III); ligand of bis-iminopyridine; and (c) co-catalyst, which is a product of reaction of water with one or more organoaluminum compound where one or more organoaluminum compound is selected out of: (i) βδ-forked compounds of formula (I): Al(CH₂-CR¹R^2-CH₂-CR⁴R⁵R⁶)_xR³ _yH_z, where R¹ is linear or forked, saturated or non-saturated C₁-C₂₀-alkyl-, C₃-C₂₀-cycloalkyl-, C₆-C₂₀-aryl- or C₇-C₂₀-alkylaryl-radical; R² is hydrogen or linear or forked, saturated or non-saturated C₁-C₂₀-alkyl-, C₆-C₂₀-aryl-, C₇-C₂₀-alkylaryl- or -arylalkyl-radical; R³ is linear or forked, saturated or non-saturated C₁-C₂₀-alkyl-, C₃-C₂₀-cycloalkyl-, C₆-C₂₀-aryl-, C₇-C₂₀-alkylaryl- or C₇-C₂₀-arylalkyl-radical; x is integer from 1 to 3; z is 0 or 1; y is 3-x-z; R⁴ and R⁵ are the same or differ, and are linear or forked, saturated or non-saturated C₁-C₂₀-alkyl-, C₃-C₂₀-cycloalkyl-, C₆-C₂₀-aryl-, C₇-C₂₀-arylalkyl- or -alkylaryl-radicals; R¹ and R⁴ or R⁴ and R⁵ substitutes form optionally one or two rings with 3-6 carbon atoms; R⁶ is hydrogen or the same as R⁴ and R⁵; (ii) (βγ-forked compounds of formula (II): Al(CH₂-CR¹R^2-CH₂-CR⁴R⁵R⁶)_xR³ _yH_z, where R¹, R², R³, R⁴, R⁵, R⁶, x, y and z are defined as for the formula (I); R⁴ and R⁵ are the same or differ, and are linear or forked, saturated or non-saturated C₁-C₂₀-alkyl-, C₃-C₂₀-cycloalkyl-, C₆-C₂₀-aryl-, C₇-C₂₀-arylalkyl- or -alkylaryl-groups; R¹ and^{R4 or R4 and R5 form optionally one or two rings with 3-6 carbon atoms; R6 is hydrogen or the same as R4 and R5 ; and their mixes where metal salt and ligand of bis-aryliminopyridine are mixed and are soluble in aliphatic or aromatic solvent.}

EFFECT: extended lifetime and enhanced catalytic activity of catalytic systems at unchanged purity and alpha-olefin output.

8 cl, 1 tbl, 21 ex