petroleum tar

基本解释

The separation and purification processes of 2,6-DMN from coal and petroleum tar are reviewed.
綜述了從煤焦油和石油中分離提純2，6-二甲基萘工藝。
Natural mineral compounds consist of carbon , hydrogen, sulphur and nitrogen or the residue from distillation of petroleum, coal tar or rosin.
瀝青天然産生的瀝青是含有碳、氫、硫和氮的鑛産化郃物。人造瀝青是蒸霤石油，煤焦油或松脂後的餘下渣滓。
The utilization and the prepartion methods of 2,6-DMN are introduced. The separation and purification processes of 2,6-DMN from coal and petroleum tar are reviewed.
本文介紹了2 ，6 -二甲基萘的用途和制備方法；綜述了從煤焦油和石油中分離提純2 ，6 -二甲基萘工藝。

And even the black goo used by the ancient Romans to lubricate their chariot axels was a petroleum-based form of natural tar.
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