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On April 20, Shanghai Huayi (Group) Co., Ltd. celebrated the successful completion of China's first domestically developed 20,000-ton maleic anhydride reactor, marking a major milestone in the country’s large-scale tubular oxidation reactor development. This reactor, which is now the largest of its kind in China and fully built using domestic technology, passed rigorous testing by the Shanghai Economic Commission and industry experts, meeting all design specifications.
The significance of this achievement goes beyond just localizing production equipment. It also paves the way for the development of other large-scale tubular oxidation reactors with similar structures. This breakthrough is expected to boost the domestic chemical industry by reducing reliance on foreign technology and enhancing self-sufficiency.
Developed by two subsidiaries of the group—Shanghai Coatings Co., Ltd. and Shanghai Chemical Equipment Co., Ltd.—the project involved extensive research and development. The teams accumulated significant technical expertise in core processes, software simulation, and equipment design. Several proprietary technologies have reached advanced levels within the country.
During the manufacturing process, researchers overcame multiple challenges, including large-scale tubular reactor welding deformation, precise pipe alignment, leak-proof welding joints, and safe lifting operations. One patent has already been filed, with several more in progress.
Maleic anhydride is a key raw material used in various industries, especially in the production of eco-friendly coatings. Historically, China relied heavily on imports for both the chemical and its production equipment, which were dominated by foreign companies. This new reactor represents a turning point, offering a reliable and cost-effective domestic alternative.
Shanghai Huayi Chemical Equipment Co., Ltd., the company responsible for the reactor's construction, has over 50 years of experience in chemical equipment manufacturing. It holds licenses for pressure vessels of types I, II, and III, as well as ASME U and U2 certifications. The company has a strong track record of excellence, with past projects such as high-pressure plate-type fertilizer vessels and liquid chlorine cylinders earning national recognition. Its recent work on low-temperature methanol washing systems for methanol equipment was awarded the National Science and Technology Achievement Prize.