... metallurgical companies; Sinopec Shanghai Gaoqiao Petrochemical, JSPCC, Sinopec Zhenhai, Yanshan Petrochemical, Tianjin Petrochemical, Qilu Petrochemical, Sinopec Yangzi Petrochemical, and other Petrochemical companies; Daqing, Yumen , Shengli, Beihai and ...