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Toymad Occasional Poster Location: Hobart Registered: August 2004	Re: Where do the different kind of fuels come from? Thu, 15 September 2005 07:16 lol, watch out mechanic kitteh! almost right illuminatus, cracking crude oil relies on fractional distillation - the longer the alkane chain, the higher the boiling point. Crude is pumped into a big vat and heated up to ~500C (i think), at which point nearly all of the crude has passed its boiling point and is in the gaseous state. The gases then rise up the column which is cooled such that the top is the coldest and it is warmer progressively as you get nearer the vat at the bottom. The differing boiling points of the various components then result in them condensing at various heights up the column and each fraction is collected separately. The most volatile (ie shortest carbon chain length) compounds make it out the top (LPG) and petrol condenses midway down, whilst oil condenses near the bottom. Tar that is used in making roads is so involatile that it stays in the vat and is collected directly once all the other fractions have boiled away. [Report message to a moderator]

	Subject	Poster	Date
	Where do the different kind of fuels come from?	adamaw11	Thu, 15 September 2005 05:12
	Re: Where do the different kind of fuels come from?	berad	Thu, 15 September 2005 05:19
	Re: Where do the different kind of fuels come from?	ehendrikd	Thu, 15 September 2005 05:24
	Re: Where do the different kind of fuels come from?	Damone	Thu, 15 September 2005 05:25
	Re: Where do the different kind of fuels come from?	adamaw11	Thu, 15 September 2005 05:42
	Re: Where do the different kind of fuels come from?	Corona RT142	Thu, 15 September 2005 05:47
	Re: Where do the different kind of fuels come from?	ehendrikd	Thu, 15 September 2005 05:53
	Re: Where do the different kind of fuels come from?	Shraka	Thu, 15 September 2005 05:54
	Re: Where do the different kind of fuels come from?	Corona RT142	Thu, 15 September 2005 05:55
	Re: Where do the different kind of fuels come from?	Toymad	Thu, 15 September 2005 06:22
	Re: Where do the different kind of fuels come from?	illuminatus	Thu, 15 September 2005 06:41
	Re: Where do the different kind of fuels come from?	Toymad	Thu, 15 September 2005 07:16
	Re: Where do the different kind of fuels come from?	illuminatus	Thu, 15 September 2005 06:43
	Re: Where do the different kind of fuels come from?	BabyZ	Thu, 15 September 2005 06:47
	Re: Where do the different kind of fuels come from?	ehendrikd	Thu, 15 September 2005 06:51
	Re: Where do the different kind of fuels come from?	Shraka	Fri, 16 September 2005 07:01
	Re: Where do the different kind of fuels come from?	EldarO	Fri, 16 September 2005 07:26

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