FIELD: chemistry.
SUBSTANCE: invention refers to method of producing final isoprene-rich and purified C5-fraction from initial C5-fraction "FCC" to be used for selective polymerising isoprene, and method of producing isoprene homopolymer from polymerising medium containing isoprene and, at least, one methyl butene, such as specified isoprene-rich and purified C5-fraction "FCC". Method of producing final fraction from initial C5-fraction involves: catalytic hydrogenation reaction of specified initial C5-fraction with palladium catalyst, leading to intermediate C5-fraction containing n-pentenes in mass fraction less than 0.1 % and methyl butenes, dehydrogenation reaction applied to intermediate C5-fraction containing methyl butenes and made of initial fraction, and purification of final fraction received in such a manner to produce purified final fraction practically recovered from disubstituted alkynes, true alkynes and cyclopentadiene. Mass fraction of methyl butenes in intermediate fraction is less than 30%.
EFFECT: provided efficiency of selective polymerising isoprene ensured by scavenging.
33 cl, 10 tbl, 4 ex
