【Ten Years of Great Progress in Chemical Technology】Industrial production of microspherical titanium-silicon molecular sieve catalysts from 2025 to 2023

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Ten years of rapid development in chemical engineering technology – praising the prosperity and strength of modern China. This is just a starting point; more participation will make things even more interesting. With you here, HaiChuan becomes even better. [Ten years of progress in chemical engineering equipment] – continuous updates and summaries available; feel free to join the discussions at https://bbs.hcbbs.com/thread-3576046-1-1.html. Enhance quality awareness and promote high-quality development. ----------------------------------------- In September 2023, the high-performance microsphere titanium-silicon molecular sieve catalyst developed by a team led by Professor Wang Xiangyu from the School of Chemistry at Zhengzhou University was included by the Ministry of Industry and Information Technology in the “Catalogue of Technologies and Products Encouraged for Adoption in the Petrochemical Industry (Second Batch)”. “The key technologies for the new generation of multi-stage pore titanium-silicon molecular sieve catalysts that we have developed, including the complete set of technical processes and specialized equipment for the preparation, separation, shaping of titanium-silicon molecular sieves, as well as the treatment of production waste, have been successfully implemented in industrial production. ”Wang Xiangyu said. 　　After an inspection by a expert group composed of academicians of the Chinese Academy of Sciences such as Yu Jihong and Han Buxing, as well as academician Liu Zhongmin of the Chinese Academy of Engineering, it was concluded that the titanium-silicon molecular sieve catalyst developed by this team possesses high crystallinity and a microspherical morphology, along with a multi-level pore structure ranging from large to medium to small sizes; as a result, it exhibits high activity, high selectivity, and excellent alkali resistance in separation tasks. At the same time, the team also designed a more rational process flow for the production of titanium-silicon molecular sieves, simplifying the manufacturing process. This approach reduced the required temperature and pressure, shortened the production time, allowed the wastewater generated during the reaction to be recycled, lowered the costs of raw materials, and eliminated environmental pollution associated with the production process. 　　At present, the **special titanium-silica molecular sieve catalyst for ammonia oximation developed by this team has been successfully applied in the caprolactam production facilities of various companies, including China Pingmei Shennma Group, Luxi Group, Shandong Dongju Chemical Co., Ltd., Yangmei Group Taiyuan Chemical New Materials Co., Ltd., and Fujian Yongrong Technology. 　　According to the tests conducted by the Henan Province Analysis and Testing Research Center as well as by the caprolactam manufacturers, the **average conversion rate for these companies is not less than 99.9%, the average yield of oxime is not less than 99.95%, and the average catalyst consumption is not less than 0.25 kilograms per ton of oxime**. 　　“The caprolactam production facility using this catalytic technology has an annual capacity of 1.2 million tons; it holds one-third of the domestic market share, generating an additional benefit of 5.4 billion yuan for the enterprise and additional profits of over 1 billion yuan. ”Wang Xiangyu said. 　　It is reported that, building on the technology of titanium-silica molecular sieve catalysts specifically designed for ammonia oximation, Wang Xiangyu’s team has successively developed titanium-silica molecular sieve catalysts tailored for the direct oxidation of chloropropene using hydrogen peroxide to produce epichlorohydrin, as well as catalysts for the direct oxidation of propylene using hydrogen peroxide to produce epichlorohydrin. In collaboration with Jiangsu Yangnong Chemical Group Co., Ltd. and Hebei Meibang Engineering Technology Co., Ltd., they have achieved industrial-scale production of these catalysts. 　　Next, the research team will continue to conduct in-depth studies on the use of hydrogen peroxide for the oxidation of various olefins, as well as on specialized molecular sieve catalysts and green reaction processes, so that more industries can adopt production technologies that are safe, environmentally friendly, and cost-effective.