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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 implemented at the 50 m³/h yellow phosphorus plant of Sichuan Linchen Group, where the system was installed and operated smoothly by October 2004. Following rigorous testing, the purified tail gas showed extremely low levels of harmful substances—phosphides, sulfides, arsenides, and fluorides were all below 1×10â»â¶ kg/m³. Moreover, the recovery rate of carbon monoxide exceeded 85%, proving the efficiency and environmental benefits of this technology.
Phosphorus is a vital raw material in the chemical industry, and the production process generates a significant amount of tail gas. This gas typically contains 85% to 90% carbon monoxide, which is essential for carbonyl synthesis. However, it also includes various harmful elements such as sulfur, phosphorus, arsenic, and fluorine. Unfortunately, many Chinese yellow phosphorus producers still rely on direct torch burning or venting of the tail gas, leading to severe air and water pollution. This practice not only harms the environment but also results in the wastage of valuable carbon monoxide resources.
According to statistics, China produces approximately 450,000 tons of yellow phosphorus annually, generating around 1.1 billion standard cubic meters of tail gas each year. With an average of 1.5 grams of phosphorus and phosphides per cubic meter and 20 grams of sulfides, this translates to about 1,687.5 tons of phosphide and 22,000 tons of sulfide being released into the atmosphere yearly. These emissions cause serious environmental damage while also wasting nearly 990 million standard cubic meters of carbon monoxide, a critical industrial resource.
Industry experts have highlighted that the technology developed by the Southwest Research Institute offers a significant breakthrough for China's environmental protection sector. It not only addresses pollution issues but also supports the country’s transition toward a more sustainable, circular economy. By recovering and purifying carbon monoxide from tail gas, this innovation represents a major step forward in both environmental protection and resource conservation.