RGN 99 - Odour Control Filter Module
BASIC FACTS
Cooking odours (molecules) generated by the combustion of animal and vegetable matter, result in an extremely complex mixture of reactive organic gases. The odour molecules are much too small to be removed by any type of mechanical filter or separator and therefore, other methods must be employed.
The three most popular methods of abating odour are the use of activated charcoal, which absorbs and retains the odour molecules, ultra-violet light technology, which oxidizes the odour molecule using metal as the catalyst, and the use of an odour-oxidant (potassium permanganate), which oxidizes the molecules to solids and then retains them. The RGN 99 filter module uses the odour-oxidant type media rather than activated charcoal, as charcoal is highly flammable and when it becomes fully saturated, it begins to desorb and release odours. This release often creates a worse odour than the original. In either case, once the abatement media is saturated, the media must be replaced.
The life of the media is dependent upon several factors such as how much media is used, type of odour, amount of odour molecules, grease loading and air temperature. When the RGN 99 molecules react with the odour, its colour will change from purple to brown. When all of the purple in the product has changed, the filter module will need to be replaced. This level of purple can be visually seen by placing the material in a small amount of water or by breaking open a pellet.
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ODOUR CONTROL
The base material is zeolite, a washed out volcanic rock. This material is naturally occurring and is not an environmental risk. RGN 99 is not classified as a hazardous material and can typically be disposed of as a non-hazardous material in a general landfill.
The process of odour abatement using RGN 99 and oxidization will typically create CO2, MnO2 and H2O as the by-products. The material will not burn and can operate to a temperature of 110°C and a relative humidity of 99.9%.
RGN 99 is purple due to the chemical manganese tetra-oxide (MnO4). This chemical is formed when potassium permanganate (KMnO4) is hydrated. It is this chemical manganese tetra-oxide that oxidizes the pollutant gases. The pellets are housed in a stainless steel module with an opening for easy removal and refilling.
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RGN 99 FILTER MODULE
RGN 99 provides a significantly longer service life than charcoal.
RGN 99 media is impregnated with 8.0% of the active ingredient potassium permanganate versus 4.0% for the activated charcoal (100% more). RGN 99 is produced at 8.0% potassium permanganate impregnated media for two simple reasons:
1. Our customers like the increased media life and value of RGN 99.
2. Only the zeolite substrate efficiently accepts an 8.0% impregnation with the appropriate production process that we use.
RGN 99 does not support combustion.
Charcoal is combustible.
RGN 99 provides a visual indicator when it needs to be replaced.
The manganese dioxide/tetra-oxide produces a purple colour, which evolves to a dull brown as the media is spent.
RGN 99 is effective on a broader spectrum of gaseous pollutants.
Potassium permanganate used in the RGN 99 production process, chemically produces manganese dioxide (MnO2) and manganese tetra-oxide (MnO4). In addition to potassium hydroxide (KOH), manganese dioxide/tetra-oxide is effective in removing sulphur dioxide, nitrogen dioxide, chlorine dioxide and mercaptans. These chemicals are not present in charcoal. Typically, corrosive pollution in a plant environment is caused by a broad group of chemicals and charcoal is too focused to handle this broad spectrum.
RGN 99 works in high temperatures and relative humidity.
Activated charcoal will not work in temperatures above 37°C or if the relative humidity of the air is above 60%. This is because the isotherms for adsorption under these conditions will not take place. RGN 99 can operate to a temperature of 110°C and relative humidity of 99.9%.
The RGN 99 Filter Module can be installed directly behind any Oil Screen Kitchen Separator. This filter combination increases separation efficiency from 32% to 72% with particles ranging in size from 3.0 µm to 0.5 µm. The RGN 99 Filter Module does not increase the air volume requirement of the hood but will increase the static pressure by 0.7 in. w.c.
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