How is China's polyphosphoric acid supply structured, and who are the key producers?

How is China's polyphosphoric acid supply structured, and who are the key producers?
China's polyphosphoric acid (PPA) supply is concentrated among thermal-route producers, with Yangzhou Ruiyang Chemical standing out as the largest domestic capacity holder using the one-step process. The company operates two 30,000-ton-per-year high-purity PPA lines, upgraded in 2017 with full-heat-recovery technology developed by Yunnan Research Institute of Chemical Industry. Yangzhou Ruiyang can produce low-arsenic PPA up to 118.8% concentration, with high polymerization degree and stable chain length. Major integrated players like Yuntianhua are also expanding into PPA, with a 22,000-ton project underway alongside food-grade phosphoric acid capacity. The market remains relatively concentrated in resource-rich provinces such as Yunnan, leveraging local phosphate rock and yellow phosphorus advantages.