Group 1 - The 12th World Congress of Chemical Engineering and the 21st Asia-Pacific Chemical Alliance Conference opened, highlighting China's position as the largest producer and consumer in the global chemical industry [1] - In the fine chemical sector, China's revenue accounts for 50% of the global market share [1] Group 2 - Comprehensive leading companies include Wanhua Chemical, the largest global MDI producer, and New Chemical Materials, which covers the entire industrial chain of polyurethane, petrochemicals, new materials, and fine chemicals [4] - Other leading companies in specific segments include Longbai Group, the world's largest titanium dioxide producer, and Yuntianhua, a domestic leader in phosphate resources [4][5] Group 3 - Potential companies include Yuanli Technology, which has the world's largest production capacity for dimethyl adipate, and Zhongyan Chemical, the global leader in sodium metal production [5]