April 10 (Xinhua) - Sinopec East China Sales Company has set the butadiene price for Shanghai Petrochemical, Zhenhai Refining & Chemical, and Yangzi Petrochemical at 17,500 yuan/ton, unchanged from the previous trading day. Sinopec North China Sales Company has set the butadiene price for Sinopec SABIC (Tianjin) Petrochemical at 17,500 yuan/ton, unchanged from the previous trading day. Sinopec Central China Sales Company has set the butadiene price for Sinopec SK (Wuhan) Petrochemical at 17,500 yuan/ton, unchanged from the previous trading day. Sinopec South China Sales Company's butadiene quotations: Guangzhou Petrochemical, Maoming Petrochemical, and Sinopec Zhongke Refining & Chemical are set at 17,500 yuan/ton, unchanged from the previous trading day.