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Shanghai has made significant progress in the development of large-scale tubular oxidation reactors, marking a major breakthrough in its key equipment projects. On April 20th, Shanghai Huayi (Group) Co., Ltd. celebrated the completion of the first domestically developed 20,000-ton maleic anhydride reactor. This reactor is not only the largest in China but also fully built using homegrown technology. It successfully passed inspection by the Shanghai Economic Commission’s Equipment Division and industry experts, meeting all design specifications.
The successful development of this reactor is more than just about localizing production equipment. It paves the way for the creation of other large-scale tubular oxidation reactors with similar structures. These advancements represent a crucial step forward in China's chemical industry capabilities.
Developed independently by two subsidiaries of the group—Shanghai Coatings Co., Ltd. and Shanghai Chemical Equipment Co., Ltd.—the reactor was the result of extensive research and development. The companies accumulated valuable technical knowledge in core technologies, software design, and simulation testing. Several proprietary technologies have reached advanced domestic standards.
During the manufacturing process, researchers overcame multiple challenges, including large-scale tubular reactor anti-welding deformation, precise pipe alignment, leakage prevention at welded joints, and safe lifting. So far, one patent application has been submitted, with several more in the pipeline.
Maleic anhydride is a vital fine chemical used in various industries, including environmentally friendly coatings. Previously, China heavily relied on imports for both the chemical and its production equipment, which were dominated by foreign firms. This new development marks a turning point, enhancing self-reliance and technological independence.
Shanghai Huayi Chemical Equipment Co., Ltd., responsible for building the 20,000-ton reactor, has over 50 years of experience in chemical equipment manufacturing. It holds design and manufacturing licenses for pressure vessels of types I, II, and III, as well as ASME U and U2 certifications. Its products have earned numerous awards, including national honors for high-quality pressure vessels and methanol equipment.