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Activated Carbon is a black, solid (powdered or granular) material resembling charcoal. It is an extremely porous material with a large internal surface area which accounts for its power to hold impurities, contaminants or color bodies by a process known as adsorption.

Activated Carbon a natural deodorant and decolorizer is one of the best adsorptive known. It is odorless, tasteless and fine black available in powder, granular and pallets form.

The use of Charcoal as an Adsorbent is very old being mentioned in an Egyptian Papyrus from 1550 BC. The ancient Hindus filtered their water with charcoal. In times of Hippocrates various ailments like ulcers were treated with char. These properties attributed to porous character are enhanced through processes called Activation.

All Activated Carbons are characterized by their pore size distribution which has been classified into Macropores (d => 25 nm), Mesopores ( d = 2-25 nm) and a large number of micropores ( d =< 2 nm). Micropores are developed during Activation and contribute mainly to the surface area. Macropores do not add much to the surface area but provide passageway for the adsorbate to the micrpores where adsorption does occur.

It is left to the skill of Activated Carbon manufacturer how to control Activation process in a way that the pore structure developed gives optimum results.

Powdered activated carbon is mainly used in liquid phase application primarily for removal of undesired color, smell and other impurities in many types of industries including basic drugs, fine chemicals, glucose, sugar, electroplating plasticizers and so on. Quite often, powdered carbon is washed with acid and then, repeatedly with water & dried to minimize impurities like soluble ash-iron, heavy metals etc. Activated Carbon is invariably used in a batch process at the penultimate stage of manufacture of a product. A pre-determined quantity of activated carbon is added to a solution and after stirring for a certain contact time mostly at elevated temperature carbon is filtered out or settled to get a sparkling color free solutions from which product is recovered.

It is pertinent to mention that use of powdered activated carbon apart from decolorizing imparts several other benefits like longer shelf life, truer, and bolder crystals, closer melting and boiling points etc.

Several test has been formulated to standardize and determine the suitability of activated carbon for specif use.

Adsorption Value Tests:
Adsorption value is determined by

  •   Iodine Test
  •   Methylene Blue Test
  •   Bromophenol Test
  •   Mollases Test
  •   Benzene Test
  •   KmnO4 Test
  •   CCl4 Test
These tests give important indication of Activated Carbons ability to adsorption. i.e. Iodine value indicates Activated Carbon?s ability to adsorb low molecular weight impurities while Methylene Blue & Mallases value gives better indication for high molecular weights. Benzene & CCl4 tests indicate for gaseous adsorption.

Purity Test
These tests are done to ascertain that Activated Carbon does not impart any of its impurities to the product being treated.

  •   Ash - It is further analysed to find out inorganic constituents like Iron, Calcium etc.
  •   Water soluble Matter ? It is further analysed to find out Chlorides, Sulphates, Phosphates etc.
  •   Acid soluble Matter ? Gives indication if the activated carbon is suitable for systems having pH lower than 4.

Miscellaneous Test
There are various other tests like Moisture, pH of water extract, Bulk density, particle size distribution etc. each giving very useful indication of its suitability  for specific use. How ever the most important is the performance test done at actual operating conditions.

The producer of Activated carbon is always in a position to make useful contribution to the Technical & Economic Success of its adsorption efficiency. We provide full technical assistance and our expertise to the users to determine the suitable grade of Activated Carbons. Changes can be made in specifications to suit the requirement of our clients but our most commonly used grades are characterized  by these specifications.

Properties Unit ACN-65 (S) ACN-65 ACN-55 ACN-45 A-350 A-250
Methylene Blue Value mg/gm 350 320 280 200 350 250
KMnO4 % 90 80 65 45 80 55
Iodine Value mg/gm 1200 1100 1050 900 1150 900
Moisture Content % 5.0
pH Value   6.5-7.2 Alkaline
Ash Content % 2.0 2.5 3.0 4.0 8.0 12.0
Iron Contents ppm 150 200 800 1000
Acid Soluble % 1.0 1.5 ***
Water Soluble % 0.5 ***
Particle Size 95% passes through 150 micron mesh
Packing 20 Kg in Polythene Bags further packed in Polythene lined HDPE Bags

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