What are the properties of air and crude oil? (fractional distillation)?

for example the properties of sea water is that salt is soluble in water which enables separation by fractional distillationWhat are the properties of air and crude oil? (fractional distillation)?
Double click on the following websites to answer your questions:





http://en.wikipedia.org/wiki/Fractional_鈥?/a>





http://science.howstuffworks.com/oil-ref鈥?/a>





http://www.elmhurst.edu/~chm/onlcourse/c鈥?/a>





http://www.energymanagertraining.com/pet鈥?/a>





http://scifun.chem.wisc.edu/chemweek/pdf鈥?/a>





http://en.wikipedia.org/wiki/Desalinatio鈥?/a>





http://en.wikipedia.org/wiki/Multi-stage鈥?/a>