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。

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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。

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Macintosh found that naphtha - a volatile, oily liquid created in the distillation the aforementioned coal tar, as well as petroleum - could be used to waterproof fabrics.

麦金托什发现，石脑油——在蒸馏前面提到的煤焦油以及石油的过程中所产生的一种易挥发的油状液体——可用于防水织物。

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

FORBES: Peak Oil and ERoEI: Still Nonsense

And Canada is still fighting for an exemption from a rule inserted into the 2007 Energy Independence and Security Act that bars the American government from buying fuels whose production causes more greenhouse-gas emissions than conventional petroleum sources, as producing oil from tar sands does.

ECONOMIST: Stephen Harper looks to Washington, not Alberta

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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