METHOD FOR OBTAINING A TITANIUM CATALYST FOR STEROOSPECIFIC POLYMERIZATION OF ISOPRENE AND CIS-1,4-ISOPRENE RUBBER OBTAINED ON THIS CATALYST Russian patent published in 2018 - IPC C08F4/642 C08F136/08 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a process for the preparation of a titanium catalyst for the stereospecific polymerization of isoprene and can be used in the petrochemical industry to produce cis-1,4-isoprene rubber of the SKI-3, SKI-3C, SKI-3D, SKI-3NT grades and others. Method for the preparation of a titanium catalyst for the stereospecific polymerization of isoprene in the presence of a catalytic system of TiCl₄-Al (iC₄H₉)₃-diphenyloxide-piperylene by reaction of toluene solutions of titanium tetrachloride containing diphenyloxide, and triisobutyl aluminum containing piperylene, at a molar ratio of titanium and aluminum catalyst components to diphenyloxide and piperylene of not less than 1:0.7 at a temperature of not more than minus 5 °C with subsequent circulation of the catalyst along a contour including a small tubular turbulent reactor of the diffuser-confuser structure, with interaction of the catalyst components is carried out directly in the additionally installed small-sized tubular turbulent reactor of the diffuser-confuser structure at a linear velocity of flows in the wide part (diffuser) of at least 1.7 m/s and the residence time of the reagents in the mixing zone is not more than 3.5 s, and the catalytic complex so prepared is alternately supplied to parallel-running volumetric apparatuses with stirring devices and cooling jackets. Feed to the polymerization of the finished catalyst from the two parallel volumetric devices running in parallel is produced by the metering pumps alternately: from one apparatus the catalyst is fed for polymerization, in the other apparatus the catalyst is recruited at this time. Reducing the consumption of the catalyst in the production of cis-1,4-isoprene rubber, in turn, leads to a reduction in the costs of washing the polymer from the catalyst residues.

EFFECT: technical result of the claimed invention is a decrease in the average particle diameter of the titanium catalyst particles in comparison with the prototype and, as a result, an increase in the specific surface area and an increase in the concentration of catalyst active sites, thereby reducing the content of the gel fraction in cis-1,4-isoprene rubber obtained by titanium catalyst, as well as an increase in the yield of cis-1,4-polyisoprene with decreasing catalyst consumption.

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