China BlueChemical Limited or China BlueChemical is the largest nitrogenous fertilizer manufacturer in mainland China by production volume and energy efficiency, engaging in processing of natural gas for production of chemical fertilizers and other chemical products. It is headquartered in Dongfang, Hainan. Its parent company is CNOOC, the third largest petroleum state-owned enterprise in mainland China. Its H shares were listed on the Hong Kong Stock Exchange on 29 September 2006. Wikipedia