Filtercorp are the sole agents in New Zealand for Hydrosil International Ltd who have made a major breakthrough in the oxidation of acid gases, fumes and odours.
Filtercorp offer three types of gas phase media:
- HS-600 - has a zeolite substrate which is impregnated with potassium permanganate (KMn04).
- XB-17 - is a 50/50 blend of HS-600 and activated carbon as some pollutant systems require both HS-600 and activated carbon for effective removal.
- HS-AC - activated carbon has a coconut base and is used principally for odour removal
Industries currently utilising gas phase filter media or systems are as follows:
- Pulp and Paper Mills: control of hydrogen sulfide, sulfur oxides, mercaptans, chlorine and other compounds
- Refineries: control of organic and inorganic pollutants
- Chemical Plants: same as refineries
- Waste Water Treatment Facilities: removal of hydrogen sulfide, sulfur oxide, mercaptans, skatole and indole.
- Steel and Related Metal/Alloy Producers: variety of pollutants are removal and/or controlled
- Shippers: minimizing exposure of fruits, vegetables and flowers to ethylene (natures ripening agent)
- Restaurants and Commercial Kitchens: removal of acrolein and odours
- Airports and Heliports: eliminating jet and de-icing fumes from concourses and tarmacs
- Museums: protecting treasures and valuables from various pollutants
- Various Other Municipal and Commercial Entities: variety of pollutants unique to their operation are minimized, controlled or eliminated.
Uses of gas filtration media and systems are widely varied.
Protection of control and computer rooms, cleansing a particular process and ensuring appropriate air quality enters a facility are just a few.
The method of gas filtration is equally varied. Scrubber systems (tanks with up to 500 cubic feet of media) are generally used for facility intake and/or output.
Cells, modules and/or trays with media usually are used in air handling devices.
All are interchangeable depending on pollutants and their level of efficiency required as determined by designer.
HS-600 provides from 50% to 100% longer service life than activated alumina products.
HS-600 media is impregnated with 6.0% of the active ingredient potassium permanganate versus 4.0% for the activated alumina products (50% more).
Hydrosil is produced at 6.0% potassium permanganate impregnated media for two simple reasons:
1. Our customers like the increased media life and value of HS-600.
2. The zeolite substrate efficiently accepts at 6.0% impregnation with the appropriate production process that we use. HS-600 has a density of 60 pounds per cubic foot versus 50 pounds per cubic foot for activated alumina.
When the media is placed in a scrubber/filter (or any fixed space) there are less open spaces or voids, approximately 20% less.
The concept is simple, round activated alumina rests like marbles in a jar while HS-600 nestles, filling the majority of the voids.
Pollutant air is "filtered" more efficiently when void spaces are minimized.
A significant increase in static pressure across the media bed is usually offset by reduced dust from HS-600 versus activated alumina products.
In summary, HS-600 density of 60 pounds per cubic foot and 6.0% potassium permanganate impregnation results in 3.6 pounds per cubic foot of active ingredient.
Activated alumina products carry only 2.0 pounds per cubic foot (50 pounds per cubic foot times 4.0%).
Mathematically, the service life of HS-600 is 80% greater.
HS-600 provides a significantly longer service life than potassium hydroxide impregnated carbon.
Hydrosil HS-600 has 3.6 pounds of active ingredient as compared to 1.6 pounds of active ingredient (32 pounds per cubic foot times 5.0%).
Mathematically, the service life of HS-600 is 125% longer.
HS-600 is effective on broader spectrum of gaseous pollutants.
Potassium permanganate used in the Hydrosil HS-600 production process chemically produces manganese dioxide (MnO2) and manganese tetraoxide (Mn04), in addition to potassium hydroxide (KOH).
Manganese dioxide/tetraoxide is effective in removing sulfur dioxide, nitrogen dioxide, chlorine dioxide and mercaptans.
These chemicals are not present in potassium hydroxide impregnated carbon.
Typically corrosive pollution in a plant environment is caused by a broad group of chemicals, and potassium hydroxide impregnated carbon is too focused to handle this broad spectrum.
HS-600 does not support combustion.
Potassium hydroxide impregnated carbon will support combustion.
HS-600 is significantly less dusty.
Zeolite used in HS-600 has a crush strength of 2,500 pounds per square inch.
Activated alumina has characteristics similar to chalk.
A simple on site test is to partially fill and shake a small container with HS-600 and activated alumina product.
The result is clear, HS-600 is substantially less dusty.
Improved air quality, less frequent final filter replacement costs and reduced net static air pressure are the result.
HS-600 provides a visual indicator when the media is spent.
The manganese dioxide/tetraoxide produces a purple colour, which evolves to a dull brown as the media is spent.
Testing is the only reliable way of knowing the remaining productive service life of the media. Visual indicators are useful in prioritising the need to test.
XB-17 Specifications
The gas phase filter media is a blend by volume of 50% potassium permanganate impregnated media with the remaining 50% volume being activated carbon.
The bulk density of the blended media shall be no less than 45 pounds per cubic foot.
The specifications for the potassium permanganate media and activated carbon are as follows:
The potassium permanganate impregnated media shall have no less than 3.6 pounds of potassium permanganate per cubic foot, a bulk density of no less than 60 pounds per cubic foot, a moisture content of 12-15% by weight and shall not dust.
The media shall have an irregular particle size of 4 x 8 mesh.
The activated carbon base shall be coconut, coal or peat with carbon tetrachloride activity of no less than 60% and a retentivity of no less than 35%.
The hardness shall be no less than 95% with an ash content of no more than 5%. The moisture content shall not exceed 2%. The particle size distribution shall be a nominal 4 x 8 or 4 mm.
Additional information is available on http://www.hydrosilintl.com
