| abstract |
The invention relates to a process for the purification of the process gas in soldering and Lötabsaugsystemen, in particular for reducing the abietic acid in the process gas, wherein the process gas to be purified is passed through a cleaning system containing one or more of the following compounds (cleaning compounds): a) carboxylic acids having reducing properties, namely oxalic acid, formic acid, citric acid and / or ascorbic acid; b) metal compounds of higher oxidation states, namely manganates, permanganates, chromates and / or dichromates; c) alcohols which can be converted by oxidation into the carboxylic acids mentioned under a); d) basic lime compounds. |