Oil refineries produce petroleum products like kerosene, diesel, petrol, etc through a process called fractional distillation. At present there are 18 oil refineries in India, chief among them are
a. Mathura in Uttar Pradesh
b. Koyali near Baroda in Gujarat
c. Kochi in Kerala
d. Haldia near Kolkata in West Bengal
e. Bongaigaon and Nunamati near Guwahati in Assam
f. Mumbai in Maharashtra – 2 refineries
