Coal tar is a by-product of coking, namely tar distillation residue in distillation kettle black material.

煤焦沥青Coal tar：煤焦沥青是炼焦的副产品，即焦油蒸馏后残留在蒸馏釜内的黑色物质。

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The components of the hydrochloric and the fire_retardant in the distillate and distillation residue were analysed after the waste water was distilled .

同时分析了将姑废水简单蒸馏后馏出液及釜液中盐酸和阻燃剂的含量。

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Any of various thick, dark, sticky substances obtained from the distillation residue of coal tar, wood tar, or petroleum and used for waterproofing, roofing, caulking, and paving.

沥青，人造沥青：某种厚厚的、黑而粘的物质，由炭焦、木焦或石油的剩余物中提炼出来，用于防水、盖屋顶、填缝和铺路。

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Indeed, the Anglo-Dutch multinational announced today that it had inked an agreement to acquire Koch Materials China , which is involved in the manufacture and marketing of bitumen--that black viscous residue taken from the distillation of crude petroleum--in the country.

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