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Coal tar
Coal tar
is a brown or black liquid of extremely high
viscosity
. Coal tar is among the by-products when
coal
is
carbonized
to make
coke
or
gasified
to make
coal gas
. Coal tars are complex and variable mixtures of
phenols
,
polycyclic aromatic hydrocarbons
(PAHs), and
heterocyclic compounds
.
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