METHOD OF ISOPRENE RUBBER PRODUCING Russian patent published in 1997 - IPC

FIELD: rubber industry, synthetic rubbers. SUBSTANCE: method involves azeotropic drying reusable isopentane-isoprene fraction and C₄-hydrocarbons distillation off. Reusable fraction is separated from solvent, catalyst and isoprene oligomers. The purified fraction is mixed with isoprene-rectificate followed by azeotropic drying the obtained hydrocarbon mixture, its cooling, aluminogel drying and polymerization. Addition of isoprene-rectificate for mixing with reusable isopentane-isoprene fraction is carried out by two flows. The first flow taken at amount 15-60% of total isoprene mass is fed to azeotropic drying process of reusable isopentane-isoprene fraction and C₄-hydrocarbons distillation off. The second flow, the remained part, is fed to the process of azeotropic drying hydrocarbon mixture and fed to polymerization. Amount of the first flow is altered depending on microimpurity amount in isoprene-rectificate. EFFECT: improved method of isoprene rubber producing. 3 tbl, 1 dwg