ACN Supply News: Tongsuh Ulsan Plant

Tongsuh to undertake planned maintenance at No.4 ACN unit

Jun 21, 2026

Tongsuh Petrochemical is likely to shut down its No. 4 acrylonitrile (ACN) unit in Ulsan. A source in South Korea informed a team member, “The company has scheduled to halt operations at the plant in mid-October 2025 for maintenance. Further details regarding the duration of the shutdown are not yet available, and verification from an authorized source could not be obtained." Located in Ulsan, South Korea, the No. 4 ACN unit has a production capacity of 265,000 mt/year.