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ENGINEERS INDIA RESEARCH INSTITUTE
4/54, Roop Nagar, Delhi-110007 (India)
Phone: 9289151047, 9811437895, 9811151047
E-mail:
[email protected]
Website: www.eiriindia.org
ACTIVATED CARBON OR CHARCOAL FROM
COCONUT SHELL (CAP: 5 MT/DAY)
[EIRI/EDPR/4694] J.C.: 2911INR, 2911US$
Activated carbon is a group of industrial adsorbent material with highly developed
internal surface area and porosity (microcrystalline porous carbon matrix with
pore diameter range of <2 nm to > 50 nm with large internal surface area to the
extent of 400-3000 m2/g as measured by the nitrogen BET method and
adsorption volumes of 0.2-0.8 cm3/g depending on activation conditions), and
hence a large capacity for adsorbing chemicals from fluids; produced by pyrolysis
and activation of carbonaceous natural as well as synthetic precursors.
Carbon is probably the most widely distributed element in nature. It occurs in two
allotropic crystalline forms viz. graphite (hexagonal system) and diamond (isomeric
system), the former is soft and black while diamond is hard and transparent.
Charcoal, coke and carbon black, classified as emorphous carbon; are considered
by some to represent a third allotropic form. They are said to be composed of very
minute crystals of graphite by others. Carbon is an essential constituent of all
vegetable and animal matter in which it occurs in combination with hydrogen,
nitrogen, oxygen and other elements in immense variety of compounds. In
combination with hydrogen it occurs as hydrocarbons in petroleum. It is also
found in carbon dioxide in air (0.03% as sodium bicarbonate in sea water, and as
calcium and magnesium carbonate in sedimentary rocks such as chalk and
dolomite.
Many carbons of industrial value are prepared from coal and from organic
vegetable and animal matter. The resulting amorphous products include charcoal,
coke and petroleum coke. Several carbon products are prepared and used in the
electrical and electro-chemical industry.