Chiba Complex

Refinery began operations in 1963. As our core Complex, it has introduced many cutting-edge devices and systems to meet robust demand, particularly in the Tokyo metropolitan area. The petrochemical plant began operations in 1975. It produces ethylene and other resins, including polypropylene. The site also includes Performance Materials Laboratories and Technology & Engineering Center, creating a production system that is directly linked to user needs.

Refinery has an atmospheric distillation unit with a crude oil processing capacity of 200,000 barrels per day, as well as a lubricant refining unit, which is Idemitsu's only lubricant production base.
The petrochemical plant includes an ethylene production unit with a production capacity of 374,000 tons per year, and an aromatics production unit that produces benzene and paraxylene.

Taking full advantage of the benefits of integrating Refinery and petrochemical plants, we have achieved an efficient and integrated production system, from oil refining to the production of plastic materials.

At Refinery, crude oil is heated to about 360℃ in a heating furnace and then sent to an atmospheric distillation unit, where it is separated into fractions that will become petroleum products such as LPG, gasoline, naphtha, diesel, and heavy oil, taking advantage of the difference in boiling points.The product is then made into a product through various processes.
Petrochemical plants use naphtha, LPG, and heavy oil sent via pipeline from Refinery as raw materials to produce everything from monomers that serve as petrochemical raw materials to polymers (synthetic resins) for plastic molding processing.

All employees at our Complex work together to carry out activities to prevent serious accidents, based on the principle of "safety first."

With the aim of "creating Complex that is trusted by local people,'' we established a green belt and started out as a "park factory'' with lush greenery that takes into consideration the local landscape and environment.

We have obtained ISO certification, which is an international standard for quality assurance, and are striving to "supply quality products economically and stably.''

Since its establishment, our Complex has consistently followed our founder's philosophy of "working together with the local community" and has valued our ties with the local community, engaging in a variety of community activities as a corporate citizen.