Congratulations for scoring this much rank in jee mains 2018.

Visit this link to have an idea of colleges that you will be getting on such  a decent rank for chemical engineering.

I would recommend to take branches like computer science,electronics and communications in prestigious National Institute of Technology

Since you have not mentioned your category i am assuming you that you are from general category.

I am listing a few colleges for you that you will get for chemical engineering.

• National Institute of Technology, Tiruchirappalli
• National Institute of Technology, Warangal
• National Institute of Technology Karnataka, Surathkal
• Visvesvaraya National Institute of Technology, Nagpur
• Malaviya National Institute of Technology Jaipur
• National Institute of Technology, Rourkela
• Motilal Nehru National Institute of Technology Allahabad
• National Institute of Technology Calicut
• Sardar Vallabhbhai National Institute of Technology, Surat