<div style="font-size: 12pt; color: black; font-family: Comic Sans MS"><p>I have just read about <font face="Arial" size="2">oil refining</font> in the spread “Oil and Gas” under the section <font face="Arial"><b>Technology and Industry</b></font> of <a target="_blank" href="http://z8.invisionfree.com/DYK/index.php?showtopic=388&view=findpost&p=3617172"><i>The Guinness Encylopedia</i></a>. :beaming:</p>
<p>Did you know? Crude oil can be refined by fractional distillation. The mixture is heated in a furnace, and the vapours rise up a fractionating column, condensing at various heights – the more volatile the constituents, the higher up the column they condense. :good: And the heavier products of distillation can be split by catalytic cracking. B)</p></div>[/dohtml]
A moment ago, I read about lignite in my Collins Gem Geography Basic Facts. Did you know? This soft form of coal is harder than peat but softer than bituminous coal.