Hey,

Here are some colleges offering B.tech Petrochemical engineering in India:

• Andhra University College of Engineering
• Jawaharlal Nehru Technological Institute
• BITS Hyderabad
• Aligarh Muslim University
• Pandit Deendayal Petroleum University
• Dibrugarh University
• IIT Guwahati
• Dehradun Institute of TEchnology.

I hope this helps.

All the best!