April 20th News: Sinopec East China Sales Company has set the butadiene price for Shanghai Petrochemical, Zhenhai Refining & Chemical, and Yangzi Petrochemical at 16,000 yuan per ton, unchanged from the previous trading day. Sinopec North China Sales Company has set the butadiene price for Zhongsha (Tianjin) Petrochemical at 16,000 yuan per ton, unchanged from the previous trading day. Sinopec Central China Sales Company has set the butadiene price for Zhonghan (Wuhan) Petrochemical at 16,000 yuan per ton, unchanged from the previous trading day. Sinopec South China Sales Company's butadiene quotations: Guangzhou Petrochemical, Maoming Petrochemical, and Zhongke Refining & Chemical are set at 16,000 yuan per ton, unchanged from the previous trading day.