TY JOUR TI MODERNIZATION THE STAGE OF METHYLAMINES RECTIFICATION IN JSC «ANHK» KW methylamines KW rectification KW grooved trays KW valve trays. JO Modern Technologies and Scientific and Technological Progress AU Shvalev, E.E. AU Kuzora, I.E. AU Dubrovskiy, D.A. AU Semenov, I.A. PY 2022 IS 2021 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»