Hi. I work in a petrochemical lab, and there is some debate over how much of a difference different weathering techniques have on the final composition of the leftover residue.
For instance, say we have a natural crude oil, complete with waxes, asphalts, and all the light-end organic compounds. We reduce the volume by 20% of several portions of this oil using the following methods:
Distilling with a rotating distillation device,
Distilling with a simple ASTM style method using a round flask sitting in a heating device,
Doing both of the previous distillations but under a vacuum,
Leaving a pool of the oil in a tray and letting the wind from a fan blow over it, and finally
Sparging the oil in a plastic bucket with a pump feeding air into a dispersion-stone in the bottom
Anyways, with all these methods performed on the same starting oil and all removing the same % of volume, can we expect the final product from all these tests to be similar in composition? Do you think some will have more light-ends left over, while others will have more heavy?
Any thoughts and literature recommendations welcome.