FILE PHOTO: China National Petroleum Corporation (CNPC)’s Dalian Petrochemical Corp refinery is seen near the downtown of Dalian in Liaoning province, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Chen Aizhu/File Photo
FILE PHOTO: China National Petroleum Corporation’s Dalian Petrochemical Corp refinery
FILE PHOTO: China National Petroleum Corporation's Dalian Petrochemical Corp refinery is seen near the downtown of Dalian