FIELD: polymerization processes. SUBSTANCE: C3- and C4- or C4-olefin-containing hydrocarbon fractions are brought into contact with oligomerization catalyst containing pentasile-group zeolite under oligomerization conditions to form stream enriched with C5+-hydrocarbons, which is cooled to separate C3+- hydrocarbon-containing stream and light-hydrocarbon stream, and passed through separator. Liquid phase from separator is fractionated and stream containing C3+-hydrocarbons is fractionated to give C5+-gasoline, C3- hydrocarbon fraction, and C4-hydrocarbon fraction. Light hydrocarbon stream contains C1-C4-components. Part of this stream and part of C4- hydrocarbon fraction are mixed with olefin-containing raw material. EFFECT: increased yield of C5+-hydrocarbons. 6 cl, 7 tbl, 2 dwg
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