Taiyo Oil and Mitsui Chemicals collaborate to expand the supply of chemically recycled products

Taiyo Oil obtained ISCC PLUS certification in June 2025 at its Shikoku Operations and in July 2025 at its headquarters. The company is also constructing facilities to receive pyrolysis oil derived from plastic waste and other feedstocks to launch chemical recycling utilizing its refinery infrastructure.

Mitsui Chemicals has been introducing bio-based hydrocarbons into its cracker at its Osaka Works and has started manufacturing and marketing plastics and chemicals using the mass balance approach since December 2021. In addition, Mitsui Chemicals has been introducing pyrolysis oil derived from plastic waste which is procured from CFP CORPORATION into its cracker and has begun manufacturing and marketing chemically recycled plastics and chemicals using the mass balance approach since March 2024.

Now, this collaborative study between Taiyo Oil and Mitsui Chemicals represents the next step for both companies, aiming to expand the supply of chemically recycled products. Specifically, the study aims to have Taiyo Oil's Shikoku Operations handle the heavy fraction of pyrolysis oil from plastic waste, which is difficult for Mitsui Chemicals to process with its crackers. Chemically recycled naphtha, propylene and other products based on the mass balance approach will then be supplied to Mitsui Chemicals. Efforts will also be made to expand the range of waste plastic feedstocks that can be utilized. Further, the two companies will study to expand the supply of bio-based products.

Taiyo Oil and Mitsui Chemicals hope that this collaborative study will help to bring about a society that is not just sustainable but regenerative.