Subject: How do oil companies refine crude oil, to make gasoline and byproducts?

Please not I am actually in grade 13.  The equivalent of first year of 
university in the United States.  (or so I'm told.)Anyway, could you 
suggest a web sight to get a diagram of the apperatus used in fractional 
distillation of crude oil. Oh, one more question, how much patrolium can 
you get from a barrel of crude oil?  
Thank you for answering my questions, I really appreciate it.  Your web-
sight is one of my favorites on the net.  Keep up the good work! : )

Re: How do oil companies refine crude oil, to make gasoline and byproducts?