Yisheng Dalian Petrochemical Co., Ltd. was established in April 2006 and is located in the Dagushan Petrochemical Industrial Park within the Dalian Economic and Technological Development Zone. With a registered capital of 2.45645 billion RMB, the company is controlled by Dalian Yisheng Investment. It is recognized as a national-level "Little Giant" enterprise (specializing in niche markets with cutting-edge technologies), a national-level "Green Factory," and a high-tech enterprise. It serves as a core petrochemical production base for Yisheng’s operations along the northern coast. The company’s Phase I PTA (purified terephthalic acid) plant commenced production in 2009. Following subsequent expansions, its total annual PTA production capacity reached 3.7 million tons. Additionally, the facility includes polyester chip production lines with an annual capacity of 1.5 million tons for PET bottle-grade chips. Its product portfolio encompasses both PTA raw materials and multifunctional PET polyester chips, catering to markets in Northern China as well as international customers in Northeast Asia.

The project was initiated in response to the national strategy for revitalizing the old industrial base in Northeast China. It incorporates a new generation of PTA production technology, featuring a high proportion of domestically manufactured equipment, which significantly reduces both construction and operational costs. Situated adjacent to a port terminal, the facility benefits from excellent maritime logistics, enabling an integrated supply chain—from the import of raw material PX (paraxylene) to the export of PTA and polyester products. The company consistently conducts clean production audits, optimizes processes for the treatment of wastewater, exhaust gases, and solid waste, and actively implements technical upgrades focused on waste-heat recovery and energy conservation. Its products are widely supplied to downstream manufacturing sectors, including PET bottle-grade chips, chemical fibers, and films. Furthermore, the company continuously develops differentiated polyester materials and expands its product specifications, providing a stable supply of raw materials for the polyester industrial chain in Northern China.