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Coconut Shell Charcoal
Agro Commodities

Unique properties of Coconut Shell Activated Carbons

Worldwide insistence on this product for a multitude of uses, particularly air/gas treatment, precious metal recovery and catalysis, is attributable to one or combinations of the following:

  • Extensive surface area in pores of to 10 Ao radius which provides unmatchable absorption and retentive capabilities for gases and low molecular weight organics

  • Intrinsic hardness of the natural grains often superior to even more expensive extruded types, assuring sustained bed volumes/Carbon inventories in circuit and hence efficiency levels, despite successive backwashes/streaming/high temp reactivations and rigours of handling or hydraulic transport of carbon.

  • High density – if mass transfer zone/pressure drop parameters are met, this property facilitates very substantial economies in filter size for the same efficiencies alternative Carbons provide

  • Low Ash content – contributing to high purity even without treatment
Raw Material:
India among other asian countries has been supplying raw coconut shell charcoal to carbon producers, in the industrialised countries. For many decades Japan, which consumes virtually half the world’s coconut carbon does so, partly as a substitute for coal carbons (used in the west) in the absence of low cost, indigenous raw coal supplies. The thicker shelled, denser, optimally charred material from India, is preferred where traditionally “typical” properties of a coconut carbon need to be accentuated. Over 100,000 tonnes/annum of Charcoal are generated in these two countries, principally from shells yielded as a by product of viable, densely located copra (from which coconut oil is extracted) and desiccated coconut (used in confectionery) industries.

The Process of Producing coconut shell activated charcoal involves the following steps:

  • Clean the coconut shells from soil, coconut fiber and other such materials

  • Sun dry the shells as a pre-process preparation

  • The shells are subjected to heating process at a burning sink or drum at 300-500oC for nearly five hours. This process is called carbonization and it creates a fixed carbon mass that is full of tiny pores.

  • It is then activated by a second heat or steam treatment (200 -1600oC) while regulating oxygen level. With this step, a large internal pore network is created and the unique filtering properties.

IStone produces Granular – irregular shaped particles and Powder – pulverized forms of activated coconut shell charcoal.

There are many applications for the activated carbon:

  • The activated coconut shell charcoal removes organic compounds from water by adsorption as well as absorption principles. In addition, bacteria will colonize the outer surface of the activated carbon and consume some of the sorbed organics.

  • The activated coconut shell charcoal detoxifies and makes safe the water.

  • Activated carbon is also used for the depolarization of sugars and sweeteners, gold recovery, color/odor correction in wines & fruit juices.
Coconut shell charcoal, thus, is a significant supporting material for food as well as non-food industries.
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