Hello,

I am a ChemE student. I have few questions. I see there are so many process modeling softwares like Aspen, Aspen Plus, Hysys, Pro II, Unisim etc.

1. What is the difference between Aspen Plus and Hysys etc? Can a problem be solved in both? Will they give same results?

2. Why are there so many versions available? Hysys 3.2, 7.3, 8.6? If I have one, does it matter which version I have?

3. I will graduate in a year. I want to get a job in this field. Where should I start?

4. Where can I get Chemcad, Unisim etc?

Thanks a lot!