TY JOUR TI TECHNOLOGICAL CALCULATION AND FEASIBILITY STUDY OF A CATALYST PREPARATION UNIT FOR ETHYLENE DIMERIZATION UNDER IMPORT SUBSTITUTION CONDITIONS KW ethylene dimerization KW butene-1 KW import substitution KW catalyst complex KW material balance KW economic efficiency JO Scientific Papers Collection of the Angarsk State Technical University AU Danilov, A.A. AU Korchevin, N.A. AU Istomina, A.A. PY 2026 IS 2026 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»