What is Coal Tar?
Coal Tar is a brown
black liquid of extremely
How Coal Tar Derived
It is a by-product obtained during the
carbonization of coal to make coke.
It is also derived from the gasification of coal
to make coal gas.
Production Process of Coal tar
1 Ton of Coal
30% gas and liquid
Tar 8-12 gal
Ammonium Sulphate 20-28 lb
Ammonia Liquor 15-35 gal
Light oil 2.5- 4 gal
Carbonization of Coal
The coke production involves the process of
coal carbonization at high temperature (1100
˚C) under the oxygen deficient environment to
concentrate the carbon.
The commercial carbonization process is
categorized into two processes:
By-product Coke production
Non-Recovery/ Heat Recovery Coke production
In By-product coke production process Coal tar
is obtained as a by-product.
While in Non-Recovery Coke making process no
by-products are recovered.
By-Product Coke Production
‘Coke side’ of a By-Product Coke Oven Battery
The process of By-Product Coke production comprises
of different steps which are as follows:
Step-1: Before carbonization, the selected coals from
specific mines are blended, pulverized, and oiled for
proper bulk density control.
Step-2: The blended coal is charged into a number of slot
type ovens wherein each oven shares a common heating
flue with the adjacent oven.
Step-3: Coal is carbonized in a reducing atmosphere and
the off-gas is collected and sent to the by-product plant
where various by-products like coal tar, light oil, etc. are
Availability of Coal Tar in Pakistan
Some local and international suppliers of Coal
tar are listed in the following tables:
Steel Mill Pakistan Verified - Rs.49,500
Pakistan Unverified 1993 N.A. 19 M.ton/
Pakistan Unverified 1999 N.A. 100 M.ton/
Pakistan Unverified - N.A. 100Mtons/
Pakistan Unverified 1999 US $450-
China Verified 2007 US
l Trade Co.,
China Verified 2007 - - T/T
Verified - - 50
Egypt Verified 1989 - 20
The details of the suppliers and their products
are also available on the internet.