Baling Petrochemical Company and Changling Refinery are both located in Yueyang City, Hunan Province. After the establishment of China Petrochemical Company, the two factories merged to form Baling Petrochemical Company. In 1990s, Changling Refinery was separated from Baling Petrochemical Company and became an independent unit. Sinopec Baling Petrochemical Co., Ltd. was established in 2020, located in Yueyang City, Hunan Province, and is a wholesale-oriented enterprise.