TY JOUR TI EXTRACTION OF BUTADIENE OF REQUIRED PURITY FROM BUTENE-DIVINYL FRACTION BY EXTRACTIVE RECTIFICATION KW extractive rectification KW butadiene KW butene-divinyl fraction JO Modern Technologies and Scientific and Technological Progress AU Ul'yanov, B.A. AU Semenov, I.A. AU Evseeva, D.V. PY 2024 IS 2024 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»