Chiba Complex

Refinery began operations in 1963 (Showa 38). As our core Complex, we have installed many cutting-edge devices and systems to meet the strong demand mainly in the Tokyo metropolitan area. The petrochemical plant began operations in 1975 (Showa 50). We produce resins such as ethylene and polypropylene. We have Performance Materials Laboratories and Technology & Engineering Center on our premises, creating a production system that is directly linked to user needs.

Refinery has an atmospheric distillation unit with a crude oil processing capacity of 190,000 barrels per day, and a lubricating oil refinery as Idemitsu's only lubricating oil production base.
The petrochemical plant has ethylene production equipment with a production capacity of 374,000 tons/year, and aromatic production equipment that produces benzene and paraxylene.

By taking full advantage of the benefits of integrating Refinery and a petrochemical plant, we have realized an efficient and integrated production system, from oil refining to the production of plastic materials.

At Refinery, crude oil is heated to approximately 360°C in a heating furnace and then sent to an atmospheric distillation unit, where the difference in boiling points is used to create petroleum products such as LPG, gasoline, naphtha, light oil, and heavy oil. Divided into fractions. Furthermore, it goes through various processes before it is made into a product.
Petrochemical plants use naphtha, LP gas, and heavy oil sent via pipeline from Refinery to produce everything from monomers that serve as petrochemical raw materials to polymers (synthetic resins) for plastic molding.

All members of 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 our Complex has consistently valued ties with the local community, based on the founder's philosophy of "working with the local community," and has engaged in various local activities as a corporate citizen.