METHOD OF PRODUCING OLEFIN OLIGOMERS Russian patent published in 2011 - IPC C10G50/00 C07C2/08 C07C11/02 C07C2/12 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing dimers, characterised by that starting material containing at least one n-olefin, selected from a group consisting of C₈-C₃₀ n-olefins or a mixture of n-olefins is dimerised at temperature 25-200°C and pressure from 0.001 mbar to 50 bars in the presence of a solid acid catalyst, passing the starting material into a catalytic distillation apparatus, having either a) a combination of a distillation column and a reactor, having at least one catalyst bed, or b) a distillation column connected to one or more side reactors containing at least one catalyst bed which contains acid catalyst solid material with a mesoporous surface of area greater than 100 m²/g, containing 0.2-30 wt % aluminium, where the number of acid site of the material ranges from 50 to 500 mcmol/g, and the material is selected from a group consisting of amorphous aluminium silicates and mesoporous molecular sieves with embedded zeolite, extracting the unreacted n-olefin in the top part of the distillation column or in the top part of the combination of distillation column and reactor in form of a side stream to be merged with the starting material, as a result of which 50-95% n-olefins get into contact with the catalyst bed more than once. The invention also relates to a method of producing base oil via hydrogenation of dimers obtained using the method described above.

EFFECT: use of the disclosed invention significantly reduces problems and shortcomings of solutions of the preceding level of technology, allowing for achieving high selectivity of dimerisation and reducing the number of secondary reactions.

16 cl, 10 ex, 10 tbl, 4 dwg