The performance and usage of coal-tarasphalt were introduced. Meanwhile, it was assumed the excellent characteristics, mechanism and technology of the modified coal tar pitch.
介绍了煤沥青的性能、用途以及有广泛用途的煤焦油改质沥青的优异特性，改质机理和生产工艺；
2
These comprise asphalt, tar and waxes.
其中包括沥青，焦油和蜡。
3
It is pointed out that to produce petro - asphalt and industrial naphthalene as main products and mixed methyl naphthalene fractions as by -product is one of important ways to utilize pyrolysis tar.