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Kailuan’s polyoxymethylene synthesis technology receives another patent Author/Source: Sinochem News Network Date: May 4, 2023 Clicks: 139 Recently, the R&D center for coal chemical industry at Kailuan was granted an invention patent by the Intellectual Property Office for its “Device and method for adding polyoxymethylene terminators,” marking the fourth invention patent obtained by this center in the field of polyoxymethylene synthesis. This technology feeds the terminator solution and water vapor into the spraying device at specific flow ratios and pressures, respectively. The terminator is heated by high-pressure steam, causing it to break down into tiny droplets. After mixing thoroughly with the condensate water from the steam, these droplets enter the polyoxymethylene twin-screw reaction reactor in a mist form. This increases the contact area between the terminator and the polyoxymethylene powder. Meanwhile, the high-pressure steam helps to reduce the activity of any residual catalysts, thereby enabling the termination reaction to proceed rapidly. As a result, the volatiles in the polyoxymethylene powder can be effectively reduced, and the thermal stability of the product can be improved. Since 2016, when it began research on polymerization pilot-scale processes and equipment upgrading and optimization, the center has been granted 3 invention patents, including one for \"a copolymerized polyoxymethylene with high melt strength and its preparation method\". These innovations have addressed issues such as the high organic volatile content in polyoxymethylene crude powder, the reduced thermal stability of polyoxymethylene caused by the large amount of boron trifluoride catalyst used, as well as the tendency of the melt to break during polyoxymethylene spinning and film extrusion processes. In recent years, they have carried out research on optimizing the inactivation technology for polyoxymethylene, improving the thermal stability of polyoxymethylene crude powder and reducing the load associated with extrusion and devolatilization during post-treatment, thereby providing a technical foundation for the development of spinning-grade polyoxymethylene and other high-value-added products.