Creating paper out of wood or pulp involves several complex processing steps in which the raw materials are chemically treated. This produces gases that have the potential to cause corrosive damage to the surrounding machinery and equipment. That is why they are classed as contaminant gases.
|Pollutant gases||Process||Viledon ChemControl pellets|
|Hydrogen sulfide (H₂S)||Lignin removal (sulfite process) wastewater treatment||CCP 104, CCP 108, CCP 210, CCP 310, CCP 810|
|Mercaptans||Lignin removal (sulfite process)||CCP 104, CCP 108, CCP 210|
|Sulfur dioxide (SO₂)||Lignin removal (sulfite process)||CCP 104, CCP 108, CCP 210, CCP 310, CCP 810|
|Sulfur oxide||Bleaching of waste paper, bleaching of wood pulp||CCP 104, CCP 108, CCP 210, CCP 310|
|Chlorine (Cl₂)||Bleaching of pulp||CCP 310, CCP 510, CCP 610|
|Chlorine oxide (ClOₓ)||Bleaching of pulp||CCP 310, CCP 510, CCP 610|
|Ozone (O₃)||Bleaching of pulp||CCP 310, CCP 610|
Particularly at risk are sensitive areas such as electronic equipment, control rooms, process control systems and compressors. The negative effects of the corrosion of the copper and silver components of these devices include a loss of process efficiency, additional maintenance costs, expensive repairs and unplanned downtime.
We provide reliable protection against corrosion by contaminant gases that are released during the main process steps in papermaking.
The technical removal of lignin is a key processing step during the manufacture of pulp. In chemical processes, the lignin needs to be dissolved from the lignocellulose and subsequently removed from the production process. Two methods have been established and are particularly important in pulp production: the sulphate and sulphite processes (see below). Depending on the procedure, various contaminant gases are released. Using different filtration media, we remove these from the air and prevent the corrosion of sensitive equipment.
Whether using wood pulp, pulp or waste paper: bleaching is an essential process step in paper production to remove unwanted stains. Because lignin is responsible for the yellowing of paper, it needs to be removed during the bleaching process. This ensures that the paper stays white. Bleaching is achieved via a technical process involving mainly chlorine bleach or a bleach with oxygen, chlorine dioxide, hydrogen peroxide or ozone. Depending on the chemical substances involved, this leads to the creation of various contaminant gases that need to be removed from the air.
At the end of the papermaking process comes the treatment of wastewater. This involves removing the polluting elements from the wastewater to restore its natural quality.
On the way from the dischargers to the sewage treatment plant, water purification is achieved through targeted chemical additives and biological processes. In the anaerobic environment, contaminant gases such as hydrogen sulfide (H₂S) are created.
This gas has the characteristic pungent odor of rotten eggs. Even more problematic than the smell, however, are the effects it has on humans and sensitive electronic components. Using special pellets and individual filtration concepts, we reliably remove hydrogen sulfide from the air.
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