Hi,
There are many colleges in Tamil Nadu that offer courses in Petrochemical Engineering.
You can go through the below given link to get a list of colleges offering the same and shortlist them.
https://www.collegedekho.com/engineering/petrochemical_engineering-colleges-in-india/
Each college has a separate eligibility criteria. Some of these colleges accept JEE scores, whereas there are some that offer admissions based on separate entrance tests or the scores obtained in 10+2.
For more updates, visit www.collegedekho.com