The waste gas is fed into the scrubber column C01 and flows upwards through the specifically selected components of the column. At the same time, scrubbing liquid is introduced at the top of the column and flows downwards through the column and its internals in countercurrent to the waste gas. This results in intensive contact between the scrubbing medium and the exhaust gas and thus in the removal of the pollutants from the exhaust gas with simultaneous loading of the scrubbing medium. The selection and dimensioning of the internals is essential here, which depends, among other things, on the exhaust gas constituents and quantities, the operating conditions such as vacuum/temperature or the liquid or gas phase that determines the transfer of substances. The now cleaned waste gas flows out of the head of the column, while the loaded scrubbing medium is collected in the sump of the column, recirculated or pumped out of the column sump.
The use of special high-boiling detergents such as polyglycols is particularly effective for washing low-boiling solvents. Internal recycling according to the VSR system is recommended for these detergents. The loaded washing agent is heated via E01 and E02 and fed into a separate stripping column C02, where it flows into the sump of the column with simultaneous stripping with steam, which takes up the loading of the washing medium, and is cleaned and cooled via E01 and E03 and pumped back to washing column C01. The loaded steam is condensed at the top of the column with a defined reflux ratio.