【Ten Years of Rapid Development in Chemical Processing Equipment】Screw compressors for chlorination off-gases and phosphorus pentafluoride from 1979 to 2022

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This post was last edited by Desert Fish on 2023-1-6 at 17:40. Watching the ten-year development of chemical processing equipment, I praise the prosperity and strength of modern China. Wishing everyone a happy New Year, and peace and health for all members of their families. This is just a preliminary contribution; more participation from everyone will make things more lively. Haichuan becomes even better with your involvement – everyone is welcome to join in the discussions on this forum. ------------------------------------------------------------------In January 2022, Institute 711 successfully won the bid for supplying chlorination exhaust gas treatment systems and phosphorus pentafluoride screw compressors to Guangzhou Jiujiang Tianci. Oil-free screw compressors have thus entered the new field of lithium battery material production. The gas compressed by the chlorination exhaust gas compressor contains HCl, SO2, SOCl2, and other trace gases, and is characterized by strong corrosivity, ease of decomposition, and ease of liquefaction. The project team at 711 Institute uses two-stage screw compressors, achieving an exhaust pressure of 2.5 MPa. Once completed, this project will enable the use of purified chlorinated exhaust gas as a raw material in lithium battery production, thereby achieving internal circulation of materials and significantly reducing the costs associated with treating chlorinated exhaust gas; it also offers notable benefits in terms of energy conservation and emission reduction. Phosphorus pentafluoride is an important raw material for producing lithium hexafluorophosphate in lithium-ion battery electrolytes. The medium gas contains toxic gases such as PF5 and HF; it is highly corrosive and decomposes easily when in contact with water, which imposes extremely high requirements on the design of screw compressor units. This project uses dry compression; by setting appropriate gaps and selecting suitable materials, it ensures that the medium remains unpolluted and the equipment is not corroded during the gas compression process.