Dicyclopentadiene (DCPD) mostly comes from the C5 fraction of by-product which is produced in the process of preparation of ethylene by petroleum cracking and by-product of the coal-coking process.
双环戊二烯主要来自石油裂解制乙烯副产物的C5馏分和煤炭焦化副产物。
Steel is an alloy of iron and carbon. Coking coal is a source of carbon in the smelting process.
钢是铁与碳的合金，焦煤便是熔炼过程中碳的来源。
Because of the low thermal conductivity of coal and the slow rate of distillation, coking is a slow process.
因为煤的导热性低、蒸馏的速度慢，所以炼焦的过程较慢。
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