A multichannel cyclone is new generation air treatment equipment that can remove fine stiff particles of up to 2 pm from air flow and reach the general effectiveness of 95%. The carried out research is aimed at establishing parameters for the dynamics of the gas-vapour two-phase flow in the cyclone and treatment efficiency removing stiff lignin particulate matter, i.e. under the increased humidity and temperature of the purified flow. The article describes the peculiarities of parameters for the cyclone separator and analyses the results of the cyclones having different inner structures under conditions of an aggressive environment. The flow polluted with lignin particulate matter has been treated under simulation conditions in the laboratory, at the gas flow temperature of 28-30 degrees C and gas flow humidity of 85-95%. Under an average vapour-PM flow velocity of 12 m/s in the cyclone polluted with ultra-dispersive 20 pm lignin particulate matter and conditions of the aggressive environment, treatment efficiency equals 82.5%. (C) 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.