N.K. Chauhan 
Crude petroleum consists of a mixture of hydrocarbons-solid, liquid, and gaseous. These include compounds belonging to the paraffin series and also some unsaturated hydrocarbons and a small proportion belonging to the benzene group.
A refinery is a production facility composed of a group of chemical engineering unit processes and unit operations refining certain materials or converting raw material into products of value.
| Refinery | State | Location |
|---|---|---|
| Jamnagar Refinery | Gujarat | Jamnagar (SEZ) |
| Essar Energy Refinery | Gujarat | Vadinar |
| Kochi Refinery | Kerala | Kochi |
| Mangalore Refinery | Karnataka | Mangalore |
| Paradip Refinery | Odisha | Paradip |
| Panipat Refinery | Haryana | Panipat |
| Gujarat Refinery (Koyali) | Gujarat | Koyali, Vadodara |
| Mumbai Refinery | Maharashtra | Mumbai |
| Guru Gobind Singh Refinery | Punjab | Bathinda |
| Manali Refinery | Tamil Nadu | Chennai |
| Visakhapatnam Refinery | Andhra Pradesh | Visakhapatnam |
| Mathura Refinery | Uttar Pradesh | Mathura |
| Haldia Refinery | West Bengal | Haldia |
| Bina Refinery | Madhya Pradesh | Bina |
| Mumbai Refinery | Maharashtra | Mumbai |
| Barauni Refinery | Bihar | Barauni |
| Numaligarh Refinery | Assam | Numaligarh |
| Bongaigaon Refinery | Assam | Bongaigaon |
| Guwahati Refinery (Noonmati) | Assam | Guwahati |
| Nagapattnam Refinery | Tamil Nadu | Nagapattinam |
| Digboi Refinery (Oldest) | Assam | Digboi |
| Tatipaka Refinery | Andhra Pradesh | Tatipaka |
