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Caprolactam is an important organic chemical raw material, mainly used for the production of nylon 6 engineering plastics and nylon 6 fibers, of which nylon 6 fibers are widely used in wool spinning, knitting, weaving, cord fabric, carpet and other industries, nylon 6 engineering plastics are widely used In electronics, automotive, packaging film and other industries. As of the end of 2007, China's total caprolactam capacity was 365,000 tons. In 2002, Sinopec listed "14 million tons/year of caprolactam as a complete set of new technology developments" in the "Ten Long" research program and was listed as a national key basic research project 973 program. Previously, China introduced and completed two sets of large-scale caprolactam plants in 1993. Since 1997, Baling Petrochemical has used its own technological advantages, and the relevant scientific research institutes within the United Nations have successfully implemented the “five (ten thousand tons) change to the original 50,000 tons/year installation of the Dutch DSM company’s HPO (phosphate hydroxylamine) method. Six (ten thousand tons), "six (ten thousand tons) change seven (ten thousand tons)" expansion and transformation. Recently, Sinopec organized technical calibration of Baling Petrochemical's 140,000 tons/year caprolactam plant and achieved full compliance with the equipment, which is currently the largest domestic unit of its kind.
The "14 million-ton/year caprolactam complete set of new technology development" project has applied for 23 domestic invention patents, has been authorized 20, applied for 2 foreign invention patents, has been granted 2 US invention patents, and the overall technology has reached the international level. Leading level, with independent intellectual property rights. The sub-items of the complete set of new technologies and the "Magnetic Stabilized Bed Caprolactam Hydrotreating Engineering Technology" project won the 2005 State's only first prize for technological inventions.
After the successful completion of the industrial application of Baling Petrochemical's new technology, compared with HPO caprolactam production technology, the complete set of new technology has the advantages of short process flow, simple operation, low investment in equipment, low production cost, reduced emission of “three wastes†per unit product, and remarkable economy. Benefits and social benefits. Cao Xianghong, chairman of the appraisal committee, academician of the Chinese Academy of Engineering, and senior consultant of China Petrochemical Corporation, commented that the successful development of a complete set of new technologies for caprolactam production is a major result of the close cooperation between the industry, universities, and research institutes and the innovative team that has continued for many years. The review experts unanimously suggested that the project should further optimize the process operations and organize the promotion and application.
This complete set of technology has been developed by Baling Petrochemical, Sinopec Petrochemical Research Institute (Stone Institute), Sinopec Engineering Construction Company, Hunan Yueyang Baili Engineering Technology Co., Ltd., Sinopec Catalyst Branch, and Xiangtan University for six years. Joint development was successful. The winner of the National Highest Science and Technology Award and the “Two Houses†academician Yan Enze participated in the development of complete sets of new technologies and went to Baling Petrochemical on the spot to organize research on the key issues. Wang Jiming, Cao Xianghong, Yuan Qingyi, Hou Fusheng, Shu Xingtian, Yuan Xiaokang, Fei Weiyang, and Xu Nanping academicians also contributed wisdom and strength to the development of complete sets of new technologies. The National Technology Invention First Prize winners Zong Baoning, Meng Xiangyi, Zhu Zehua and others have conducted technical discussions and collective research at Baling Petrochemical.
The technology of cyclohexanone production by the cyclohexanone oxidation technology in the new technology of 140000 tons/year caprolactam has improved the stirring structure of the reactor, the reaction and the optimization of the separation process, so that the production capacity of the reaction part of the device has increased by 67,000 tons/year. To 81,600 tons/year, the processing capacity of the cyclohexanone refining section reached 124,000 tons/year, the quality of cyclohexanone was excellent, and the consumption of raw materials decreased significantly.
Cyclohexanone ammoximation synthesis of cyclohexanone oxime process technology, is the core of the new caprolactam production technology. The 70,000-ton/year cyclohexanone oximation industrial plant built using this technology has a simple process, reasonable design, convenient operation, stable operation, technical indicators meet the design requirements, and has strong technological innovation, and has reached the international leading level of similar technologies. Cyclohexanone oxime tertiary rearrangement technology, through the study of the rearrangement reaction kinetics, has developed a novel rearrangement reaction process and rearrangement reactor, enabling the production capacity of the device to reach 140,000 tons/year, reducing the acid to cerium ratio and Raw material consumption improves quality.
New caprolactam refining technology, the development of a neutralization crystallization process, effective separation of crude caprolactam and thiamine, improved thiamine quality, reduced energy consumption, development of a new rotary disc extraction column, improved caprolactam extraction efficiency, and development of magnetics The stable bed hydrogenation technology reduces the consumption of catalyst, and the caprolactam PM value is obviously increased. The use of pre-distillation technology instead of the flash evaporation process can effectively remove the water and light components in caprolactam. After a systematic study, the key factors affecting the quality of caprolactam products were found, and the superior product rate of caprolactam products was greatly improved. Integrated cyclohexanone oxidation to cyclohexanone, cyclohexanone ammoximation to cyclohexanone oxime, cyclohexanone oxime three-stage rearrangement, caprolactam refining and other new technologies, completed the "14 million tons/year caprolactam complete set of new technology "Package" development and compilation.
In order to convert the technological advantages of the new technology of caprolactam into industrial advantages, Sinopec has modified and expanded the caprolactam plant of Baling Petrochemical into the transformation and construction content of the integrated refinery and chemical project of Yueyang in 2008-2010. According to the plan, Baling Petrochemical has started to adopt new technologies to convert the existing 140,000 tons/year caprolactam plant to 200,000 tons/year and build a new 200,000 tons/year caprolactam plant. At the same time, Sinopec Shijiazhuang Refining & Chemical Co., Ltd. also embarked on a new technology to recast the existing 60,000 tons/year caprolactam plant to 170,000 tons/year.
Recently, Sinopec's “10-Tung Lung†project, one of the “140000-ton/year caprolactam complete new technology development†project, passed the technical appraisal of Sinopec in the Sinopec Group Baling Petrochemical Company. This internationally leading level and the complete set of new technologies with independent intellectual property rights is a sign that Sinopec has acquired core competitiveness in the field of caprolactam production and has become one of the world-renowned caprolactam producers.