TY JOUR TI RECTIFICATION COLUMN IN THE UNIT OF CLEANING AND PRODUCTION OF LIQUEFIED GASES KW rectification column KW liquefied gases KW double-flow valve plate KW heat exchanger KW contact devices KW mass transfer JO Vestnik of Astrakhan State Technical University AU Nevdasheva, D.. AU Artemieva, N.. PY 2018 IS 2018 PB Astrakhan State Technical University