Sinopec Caprolactam Technology Sets Leading International Technology

Sinopec's "10-Tung Lung" project, part of the broader "140,000-ton/year caprolactam complete new technology development" initiative, recently passed a technical review at Baling Petrochemical Company within Sinopec. This groundbreaking technology, featuring independent intellectual property rights and reaching international leading standards, marks a significant milestone for Sinopec in establishing core competitiveness in caprolactam production and positioning itself as a global leader in the industry. Caprolactam is a key raw material used in manufacturing nylon 6, which finds extensive applications in engineering plastics and fibers. These materials are widely used in textiles, automotive parts, electronics, and packaging. By 2007, China’s total caprolactam capacity reached 365,000 tons annually. In 2002, Sinopec included this project in its "Ten Long" research program and designated it as a national key basic research project under the 973 Program. Prior to this, two large-scale plants were imported and completed in 1993. Since 1997, Baling Petrochemical has been leveraging its technological expertise to upgrade and expand existing facilities, including transforming a Dutch DSM HPO (hydroxylamine) plant from 50,000 to 70,000 tons per year. The latest 140,000-ton/year caprolactam plant at Baling achieved full compliance with technical standards, making it the largest domestic unit of its kind. The project has secured 23 domestic invention patents, 20 of which have been granted, along with 2 foreign patents, including 2 U.S. patents. Its overall technology is recognized as internationally leading. A key sub-project, the "Magnetic Stabilized Bed Caprolactam Hydrotreating Engineering Technology," won the 2005 National First Prize for Technological Invention. Compared to traditional HPO technology, the new system offers shorter process flows, simpler operations, lower equipment investment, reduced costs, and fewer emissions. Experts praised the project for its economic and social benefits and recommended further optimization and wider application. This technology was developed over six years by Baling Petrochemical, Sinopec Research Institute, Sinopec Engineering Construction, Hunan Yueyang Baili Engineering, Sinopec Catalyst Branch, and Xiangtan University. Notable contributors included Academician Yan Enze, winner of the National Top Science and Technology Award, and several other academicians who provided critical insights. Key innovations include improved reactor design and optimized separation processes in cyclohexanone oxidation, boosting production capacity. The ammoximation process for cyclohexanone oxime, a core component of the technology, features a 70,000-ton/year industrial plant with stable operation and high innovation. The three-stage rearrangement process also achieved world-leading performance, reducing raw material use and improving product quality. New refining techniques, such as neutralization crystallization and magnetic-stabilized hydrogenation, significantly enhanced efficiency and product purity. Pre-distillation technology helped remove impurities, leading to higher-quality caprolactam. These integrated advancements formed the foundation of the complete new technology package. To fully leverage these advantages, Sinopec expanded Baling’s facility as part of the Yueyang Integrated Refinery and Chemical Project between 2008 and 2010. The company planned to upgrade the 140,000-ton/year plant to 200,000 tons and build a new 200,000-ton plant. Similarly, Sinopec Shijiazhuang Refining & Chemical Co. upgraded its 60,000-ton plant to 170,000 tons using the same advanced technology.

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