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Yellow phosphorus tail gas purification and CO purification technology to eliminate pollution
In 2003, the Southwest Research Institute of Chemical Industry successfully developed a groundbreaking technology for the purification of carbon monoxide from yellow phosphorus tail gas. This innovation was later implemented at the Sichuan Linchen Group's Yellow Phosphorus Plant, where a 50 m³/h purification system was installed. The project was completed and operated smoothly in October 2004. Following rigorous testing, the purified tail gas contained phosphide, sulfide, arsenide, and fluoride levels below 1×10â»â¶ kg/m³, with a carbon monoxide recovery rate exceeding 85%, marking a significant achievement in industrial waste management.
Phosphorus is a crucial chemical raw material, and the tail gas generated during its production contains approximately 85% to 90% carbon monoxide, which serves as a fundamental component for carbonyl synthesis. However, this gas also includes harmful substances such as sulfur, phosphorus, arsenic, and fluorine. In China, most yellow phosphorus producers currently handle their tail gases by burning them off through torches or releasing them into the atmosphere, leading to severe environmental pollution and the wasteful loss of valuable carbon monoxide resources.
According to data, China produces around 450,000 tons of yellow phosphorus annually, generating approximately 1.1 billion standard cubic meters of tail gas each year. With an average of 1.5 grams of phosphides and 20 grams of sulfides per standard cubic meter, this results in over 1,687.5 tons of phosphides and 22,000 tons of sulfides being released into the atmosphere annually—substantial pollutants that cause serious environmental damage. Additionally, about 990 million standard cubic meters of carbon monoxide are wasted, representing a missed opportunity for resource reuse.
Industry experts have highlighted that the yellow phosphorus tail gas purification and carbon monoxide recovery technology developed by the Southwest Research Institute represents a major step forward for China’s environmental protection sector. It not only addresses critical pollution issues but also aligns with the technical demands of a circular economy, offering sustainable solutions for industrial waste management and resource conservation.