Idemitsu Kosan operates the Chiba II refinery, which is located in Chiba, Japan. It is an integrated refinery owned by Idemitsu Kosan. The refinery, which started operations in 1963, has an NCI of 8.6.

Key processes of the refinery

Crude Distillation Unit (mbd): 190
Vacuum Distillation (mbd): 66
Catalytic Cracker (mbd): 45
Hydrocracker (mbd): 10
Reformer (mbd): 17
Hydrotreater (mbd): 246

The capacity of the refinery is expected to remain the same as 190mbd by 2030.

Maintenance activities at Chiba II refinery

The Chiba II refinery witnessed four incidents during the period 2015-2020.

About Idemitsu Kosan

Idemitsu Kosan Co Ltd (Idemitsu) is an integrated energy company that explores, produces, refines, and sells oil and gas, lubricants, and petroleum products. The company manufactures agricultural chemicals, agricultural materials, and other chemicals. It explores, develops and extracts coal and other mineral resources. Idemitsu also develops, manufactures, and sells functional electronic materials and computer software. The company operates in the engineering, agricultural biotechnology and renewable energy operation. It has operations in South East Asia, Australia, North and South America, Europe and Russia, and Middle East & Africa. Idemitsu is headquartered in Tokyo, Japan.


Information on the refinery is sourced from GlobalData’s refinery database that provides detailed information on all active and upcoming, crude oil refineries and heavy oil upgraders globally. Not all companies mentioned in the article may be currently existing due to their merger or acquisition or business closure.