Coal tar is a by-product of coking, namely tar distillation residue in distillationkettle 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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Oil industry: fatty acid distillation, oil decomposition, concentration, esterification, vacuum deodorization control temperature and reaction kettle, the reaction kettle heating.