There are five Chinese prefix state-owned enterprises in Nanjing. Jinling Branch of China Petrochemical Co., Ltd. and Jinling Petrochemical Co., Ltd. of China Petrochemical Group are collectively referred to as Jinling Petrochemical. Founded in 1982, the company is mainly engaged in petroleum refining and processing, production and sales of petrochemical products. The main business of oil refining can be traced back to 1950s, and it was a national key project during the first five-year plan period. With complete crude oil processing methods and strong production technology, the company is the third largest crude oil processing base in China, the largest producer of clean gasoline and jet fuel, and the largest producer of detergent raw materials in Asia. Jincheng Group Jincheng Group Co., Ltd. was established in Nanjing 1949, and belongs to aviation industry corporation of china. In the course of 60 years' development, Jincheng Group takes aviation as its mission to serve the country and strengthen the army and enrich the people. While making outstanding contributions to national defense and economic construction, the enterprise has continuously developed and expanded, with more than 8,000 employees, becoming a large enterprise group with five industries: electromechanical hydraulic, light industrial power, vehicles, international and production services. Yangzi Petrochemical China Petrochemical Yangzi Petrochemical Co., Ltd. (formerly Yangzi Petrochemical) is located in Nanjing, Jiangsu Province, and is a wholly-owned subsidiary of China Petrochemical Co., Ltd. (China Petrochemical). Its registered address is No.28, Gaoke No.1 Road, Nanjing High-tech Industrial Development Zone. Jinling Hotel is located in the northwest of Xinjiekou, Gulou District, Nanjing. It used to be the tallest building in China, a landmark building in Nanjing and the first luxury five-star hotel in Jiangsu Province.