Yibin Haifeng Herui Co., Ltd. was founded in Yibin in 2006 as a controlled subsidiary of Yibin Tianyuan Group Co., Ltd. (stock code: 002386, hereinafter 'Tianyuan Group'). Inheriting Tianyuan Group's more than 80 years of chlor-alkali chemical technology accumulation, it is the group's main base for chlor-alkali basic chemicals and fine chemicals, with main products including caustic soda, polyvinyl chloride (PVC), hydrazine hydrate, cement, and trichloroethylene. As a pioneer of environment-friendly circular economy in the chlor-alkali industry, the company was the first among its domestic peers to build a circular economy industrial chain integrating energy, thermal power, calcium carbide, chemicals, and building materials, along with a green clean production model, establishing comprehensive competitive advantages; it is a bellwether of the healthy development of China's calcium carbide process PVC industry. It is now the largest hydrazine hydrate production base in southern China, a pilot enterprise for resource-utilization circular economy standardization in the chlor-alkali industry, a national circular economy standardization pilot enterprise, one of the first batch of national green factory demonstrations in the green manufacturing system, and a national high-tech enterprise, holding more than 140 advanced patents covering PVC, trichloroethylene, hydrazine hydrate, etc., many of which are of international advanced level.