Why Gas Phase Pollution Control?
Hydrosil International Limited is a leading producer of Odor, Corrosion and Water control media.
Discussion of Pollutant/Corrosive Gases
The use of chemicals or process reactions results in the creation of various corrosive gases. Some are detectable through normal human sense and others are identifiable only through technical tests. Virtually all corrosive gases under normal relative humidity will increase the rate of deterioration of expensive capital equipment in control rooms, computer installations and/or other sites, as well as inventory and other company assets. In some cases, losses are quick and dramatic. In others, the time horizon is longer and the effect more subtle. In all occurrences, down time, lost product and unnecessary capital and ongoing expenses arise.To identify if these conditions are occurring in your environment, two methods can be used. The first is to observe the replacement timing and cost for the capital equipment, ie. computers, transmitters, receivers & switchgears. If the equipment is seeing heightened service due to electrical failure and (by closer inspection) corrosion is occurring at contact points of electrical connectors you have a corrosion problem.The second method is to analyze the air over an extended period of time using a corrosion coupon. A corrosion coupon consist of a silver and/or copper strip mounted on a Plexiglas holder. These coupons can can be purchased. To determine if the atmosphere is corrosive, place the coupons in the areas of interest, continuing activities as normal. After an exposure period, typically 30 days, the coupons are returned to an independent laboratory for determination of type (s) and levels of pollutants present. The independent lab will analyze the coupons and inform you of the results.The instrument society of America classifies environments as mild, moderate, harsh or severe depending on the levels identified on the coupons. Ideally your environment should be at a mild status. If the level of reactivity on the copper and/or silver coupons places the atmosphere in a severe, harsh, high, or moderate condition, a gas phase filter system is suggested. Hydrosil will be pleased to assist you in the identification of any pollutant gases that may be present and help you select a cost effective filter system (if necessary) and/or identify and provide the appropriate pollutant gas removal media.
Industries currently utilizing gas/liquid filter media or systems are as follows:
Activated carbon is the trade name for a carbonaceous adsorbent which is defined as follows1:
Activated carbons are non-hazardous, processed, carbonaceous products, having a porous structure and a large internal surface area. These materials can adsorb a wide variety of substances, i.e. they are able to attract molecules to their internal surface, and are therefore called adsorbents. The volume of pores of the activated carbons is generally greater than 0.2 ml g -1. The internal surface area is generally greater than 400 m2 g-1. The width of the pores ranges from 0.3 to several thousand nm.
Activated carbons have been used for many years quite successfully for adsorptive removal of impurities from exhaust gas and waste water streams. However, for cost-effective removal of certain impurities contained in gases (such as hydrogen sulfide, mercury and ammonia), the adsorption capacities and the feasible removal rates must be substantially boosted by impregnation of the activated carbon by suitable chemicals. When these chemicals are deposited on the internal surface of the activated carbon, the removal mechanism also changes. The impurities are no longer removed by adsorption but by chemisorption.
Impregnated activated carbons are carbonaceous adsorbents which have chemicals finely distributed on their internal surface. The impregnation optimizes the existing properties of the activated carbon giving a synergism between the chemicals and the carbon. This facilitates the cost-effective removal of certain impurities from gas streams which would be impossible otherwise. For environmental protection, various qualities of impregnated activated carbon are available and have been used for many years in the fields of gas purification, civil and military gas protection and catalysis.
Hydrosil Environmental Remediation media is to be used with:
Constituents have had a 95%+ Reductions when treated with these media
Hydrosil - XB-17 - Activated Carbon
50/50 blend by volume of HS-600 and activated carbon. Various pollutant systems require both HS-600 and activated carbon for effective removal.
Hydrosil - HS-AC-KOH - Activated Carbons
The activity carbon base shall be coal based with a carbon tetrachloride activity of no less than 60% and retentivity of no less than 35%. The hardness shall be no less than 95% with an ash content of no more than 15%. The particle size distribution shall be a nominal 4.0 mm diameter and a length of 6.0 mm. The mean particle diameter shall be a minimum of 4.7 mm. The iodine number shall be a minimum of 1000 milligram per gram and a surface area of no ...