Tongsuh Petrochemical Corp., Ltd. is a leading South Korean petrochemical company engaged in the manufacture of acrylonitrile, sodium cyanide, and acetonitrile. Established in 1969 as Korea's first producer of acrylonitrile, the company operates a major integrated production site in Ulsan, achieving an annual acrylonitrile capacity of approximately 600,000 metric tons, positioning it among the world's largest single-site producers.
It functions as a wholly owned subsidiary of Asahi Kasei Corporation of Japan, which acquired full ownership in 1998. The company exports to approximately 39 countries and supplies key players in the ABS resin, acrylic fiber, and specialty chemicals sectors. In addition to primary products, it commercializes by-products and derivatives to enhance value addition.
Tongsuh Petrochemical emphasizes sustainable operations, holding certifications including ISCC PLUS for sustainable acrylonitrile production and recognition from EcoVadis for sustainability performance. It maintains compliance with international standards for cyanide management and focuses on reducing environmental impact through process improvements and biomass raw material utilization.
Within the Asahi Kasei Group, Tongsuh plays a critical role in the global supply of acrylonitrile and related chemicals, supporting downstream industries while advancing the group's sustainability goals.
Also known as TongSuh Petrochemical Corporation, Ltd..
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Independent audit confirmed the fiscal‑2025 product carbon footprint for acrylonitrile at the Ulsan plant, covering raw materials through production and exceeding limited‑assurance standards.
