TY JOUR TI IMPROVEMENT OF THE EFFICIENCY OF THE UNIT FOR THE EXTRACTION OF PROPANE-PROPYLENE FRACTION AT "ANGARSK POLYMER PLANT" KW propane-propylene fraction KW rectification KW pyrolysis resin JO Modern Technologies and Scientific and Technological Progress AU , .. AU Dement'ev, A.I. PY 2025 IS 2025 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»