Abstract: The present invention relates to a method and a column to handle foaming liquids or high viscous liquids and prevent flooding in liquid-gas mass transfer operations. Said operation is carried out by using higher or equal pressure at the liquid inlet than at the liquid outlet in said column. Said column comprises a single shell (7) housing at least one tray, where said shell is provided with at least one liquid inlet (1), one liquid outlet (11), one separate gas inlet (5) for each of said trays and at least one outlet (2) for gas leaving said column.