Chloric Gas Absorption
In the production of chlorine all the resulting emissions including those from possible breakdowns must be collected together and conveyed to a gas cleaning system. Therefore, an absorption plant is an essential part of the standard equipment.
In general terms, we can distinguish four types of emission:
- During normal operation any constantly occurring leaks, e.g. in the filling plant, are drawn off.
- When starting up a block of cells, the entire chlorine production of these cells must be sucked up and absorbed until they produce virtually inert gas-free chlorine.
- If the chlorine compressor or the chloric gas aftertreatment unit breaks down, the entire quantity of chloric gas which is produced must be fed through the absorption plant.
- In the event that there are leaks in the tanks, or the piping and fittings are not tight, the absorption plant operates as an emergency unit.
Diluted caustic soda, which occurs as a by-product in chlorine factories, is used for absorption in the scrubbing plant.
An absorption plant is expected to clean the exhaust air in all four cases shown above so that it complies with legally established emission values.
It must also offer a maximum level of operating safety. GEA is providing a three stage chlorine absorption plant for this application.
In order to combat accidents in chlorine storage areas, dosing stations and during the transportation of chlorine, emergency scrubbing units can be offered.