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煤焦油是什么?煤焦油是一种非常复杂的混合物,为炼焦所得副产品之一。在工业上的经济价值极大,因为从煤焦油内能提出多种在化学工业上和国防工业上极有用的化学品如苯、甲苯、萘、酚、吡啶、蒽……等以及在基本建设和筑路上必需的材料——柏油和沥青。依分馏温度的不同,可将煤焦油分为五个部分:1.轻油:为低于150℃蒸馏所得的分馏部分,主要为苯及其衍生物。2.中油或萘油:150—210℃蒸馏所得,主要为萘和酚。3.重油或杂酚油:210℃—270℃蒸馏所
What is coal tar? Coal tar is a very complex mixture, one of the by-products of coking. It is of great economic interest in the industry because many chemicals that are highly useful in the chemical and defense industries, such as benzene, toluene, naphthalene, phenol, pyridine, anthracene, etc., can be proposed within coal tar, And the necessary material on the road - asphalt and asphalt. Depending on the fractionation temperature, coal tar can be divided into five parts: 1. Light oil: The fraction obtained by distillation below 150 ° C is mainly benzene and its derivatives. 2. Oil or naphthalene: 150-210 ° C distillation, mainly naphthalene and phenol. 3. Heavy oil or creosote: 210 ℃ -270 ℃ distillation place