petroleum tar

基本解释

The separation and purification processes of 2,6-DMN from coal and petroleum tar are reviewed.
综述了从煤焦油和石油中分离提纯2，6-二甲基萘工艺。
Natural mineral compounds consist of carbon , hydrogen, sulphur and nitrogen or the residue from distillation of petroleum, coal tar or rosin.
沥青天然产生的沥青是含有碳、氢、硫和氮的矿产化合物。人造沥青是蒸溜石油，煤焦油或松脂后的余下渣滓。
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.
本文介绍了2 ，6 -二甲基萘的用途和制备方法；综述了从煤焦油和石油中分离提纯2 ，6 -二甲基萘工艺。

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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Given the extent to which sand, tar or murderous thugs get in the way of petroleum production, it's no surprise that Shell's engineers see salvation in natural gas.
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