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。
Oil industry: fatty acid distillation, oil decomposition, concentration, esterification, vacuum deodorization control temperature and reaction kettle, the reaction kettle heating.
油脂工业：脂肪酸蒸馏、油脂分解、浓缩、酯化、真空脱臭等反应釜控温，反应釜加热。
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