Could anybody tell me how Aspen or PRO/II calculates the ASTM D86 boiling curve for streams made up of real components? With real components I mean a light naphtha defined as made up of about 20 to 30 components like x% 2-methyl-pentane, y% benzene, z% methyl-cyclopentane, etc. I've tried to do a series of sequential isothermal flashes at different temperatures but that doesn't work. Even the initial boiling point of the curve doesn't match the atmospheric boiling point of the mixture.

Any help would be greatly appreciated. Regards,

Schicklgruber