Synthesis of polyisoprene on modified turbulent flow in the titanium catalysts

Currently microheterogeneous titanium catalyst is widely used to produce stereoregular polyisoprene, which is one of the largeproducts of modern manufacture of synthetic rubber. In the work the regularity of titanium catalyst formation at temperatures of (–10)÷(–15) °C and the polymerization of isoprene in the medium aliphatic solvent (isopentane) in changes of suspension motion hydrodynamic regime of the catalytically active particles are considered. For this purpose, the mixing is enhanced due to the turbulence of the suspension flow in the external recirculation loop during the entire process of active sites formation and their selection for the polymerization. Small tubular turbulent apparatus of diffuser-confusor design used in this stage for the first time. Polymerization of isoprene occurs on one type of centers, forming a polymer with narrow molecular weight distribution (polydispersity coefficient is 2,1–2,8). Hydrodynamic effects on the titanium industry microheterogeneous catalyst in the process of pre-formation by circulating in a tubular device, confusor diffuser design provides a more reactive centers of the macromolecules growth. This leads to the synthesis of more stable in the parameter «Mooney viscosity» of high polyisoprene. Modification of the titanium catalyst due to hydrodynamic effects on the suspension of the catalytically active species in the formation of the catalytic system is an effective way to improve the appropriate stage of the industrial production of polyisoprene.

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