Breakthrough progress in China's petroleum mesoporous
molecular sieve technology
According to the national first-level search agency, FCC catalysts containing mesoporous molecular sieves have not been reported on large-scale catalytic cracking units, indicating that the technical application level of China Petroleum and Petrochemical Institute has reached the forefront in the world.
The development of mesoporous molecular sieves for macromolecular conversion to catalyze new materials has been an international problem. In recent years, researchers have made in-depth research on mesoporous molecular sieve synthesis technology, and achieved remarkable results in basic theory and reaction process, but the three key problems that restrict the application of mesoporous molecular sieve have not been effectively solved: First, mesoporous molecular sieve The amorphization of the pore wall structure directly leads to structural collapse under severe reaction conditions. Secondly, the tetracoordinated Al in the crystal structure is the source of the acid site, resulting in insufficient acid activity. The third is the synthesis of mesoporous molecular sieves. The use of organic templating agents limits their large-scale production.
As a bridge between macropores and micropores of meridized catalysts, mesoporous molecular sieves have broad prospects for macromolecular cracking. However, due to high production cost and hydrothermal stability, it is difficult to meet the severe reaction conditions of catalytic cracking, so that they can be used in catalytic cracking catalysts. The application has become a worldwide problem. With the support of the National Science and Technology Support Program and China Petroleum Science and Technology Project, the key scientific issues that restrict the development of mesoporous molecular sieve technology, the high-Petrochemical Institute and the Liu Hongtao team of Beijing University of Chemical Technology formed a joint research project team. After more than ten years of painstaking research, In the structure of mesoporous molecular sieves and the creation of synthetic systems, major breakthroughs have been made. The pore-wall pseudo-crystal assembly method has been constructed to improve the stability, and the high-grade tetra-coordinated aluminum has been created to improve the acidity. The high-concentration seed crystal has been invented. A new low-cost preparation method for synthesizing mesoporous molecular sieves, which improves hydrothermal stability by 2.5 times, acidity by nearly one time, and molecular sieve production cost by 70%, which overcomes many problems from laboratory trials to industrial production. For the first time in the world, it has successfully developed a complete set of technologies for industrial continuous production of low-cost, environmentally friendly, high-performance mesoporous molecular sieves.
Due to the major breakthroughs in the basic theoretical research and synthesis technology of mesoporous molecular sieves, the research and development level of China Petroleum's basic materials for mesoporous molecular sieves has leapt to the international advanced level. Based on this, the project team developed a catalytic cracking catalyst LPC-65 with a high-performance mesoporous molecular sieve as a functional component (commercial grade MASTER-1) to reduce the olefin content of catalytic gasoline, and in September this year in Lanzhou Petrochemical Successful application. The industrial application shows that under the condition that the inferior quality of raw materials is intensified and the catalyst consumption is reduced by 30%, the product distribution is improved comprehensively, especially the gasoline olefins are reduced from 35% to 30%, and the lowest is 28.3%. At the critical moment, LPC-65 catalyst provides excellent technical support for the reduction of olefin performance in the depth of the production of VI gasoline in Lanzhou Petrochemical production and improvement of enterprise efficiency. This is also the first large-scale application of mesoporous molecular sieves to a million-ton catalytic cracking unit in the world, which fully proves that MASTER-1 molecular sieve has outstanding hydrothermal stability and heavy oil conversion ability. In the implementation of the project, 12 papers have been published in SCI, and 8 invention patents have been filed. Six core invention patents involving synthesis, modification and application have been authorized. The paper has been cited and highly praised by Harvard University scholars.
The successful development of high-hydrothermal stability and high-acid mesoporous molecular sieve high-efficiency synthesis technology is a major breakthrough in the synthesis technology of the international mesoporous molecular sieve field. It is also a major breakthrough in the research work of the China Petroleum and Petrochemical Institute and a technological breakthrough. A successful example. The new materials not only create conditions for mesoporous molecular sieves to be used in catalytic cracking, hydrocracking and other refinery catalysts, but also provide new ways to improve the reaction efficiency of catalytic processes such as fine chemicals and environmental protection, and promote the development of catalytic disciplines and the development of molecular sieve industry. Have important scientific value.