TY JOUR TI MODELLING OF METHYLAMINE RECTIFICATION PROCESS KW rectification KW methylamines KW simulation KW efficiency KW contact devices JO Modern Technologies and Scientific and Technological Progress AU Ul'yanov, B.A. AU Semenov, I.A. AU Dubrovskiy, D.A. PY 2020 IS 2020 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»