0k its true i don't know where put this question.

First I'm Industrial Chemical Engineer (I. Q. I. in spanish LOL ), well my work refers to a hydrocarbon characterization but in some case we have to work with simulator PRO II and feed the assay data from distillation curve, and have many forms to adjust the model and have a good characterization and so on. But what is the limit, why PRO II can't work with congenital water if work with different EO'S why can´t do a envelope phase diagram with water how can i work with manual envelope diagrams?

Well thanks for these times for free my soul.