Multiphase reaction engineering: laying the foundation for industrial upgrading
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Mao told reporters in sand: “Chemical engineering is an engineering discipline. Basic research not only plays a key role in its development, but also is a sustainable development and technological advancement of process industries such as petroleum refining, chemicals, energy, and new materials. Basics.†The reporter learned that Mao led a group of young PhDs in sand, etc., and carried out close cooperation with Sinopec Shijiazhuang Refinery Branch Company and other enterprises. Many times they went deep into the production site and applied the multi-phase system chemical reaction engineering and reactor basic research results to multiple large-scale industrial multiphase reactors in the SNIA caprolactam process imported from Italy, which helped the company to successfully carry out technological transformation. Energy saving, emission reduction, and consumption reduction have yielded significant results.
Mao proposed in sand: "This result shows the fact that the basic research of multiphase system chemical reaction engineering plays an important role in promoting technological innovation in process industries."
One of the experts who once recommended this project—the late academician Wang Jiading of Tsinghua University believes that the project team has been involved in the complex flow, heat transfer, mass transfer, and reaction process mechanisms in multiphase chemical reactors from single droplets, bubbles, and granules for more than 20 years. A systematic study of the reactor's macroscopic processes and their interrelationships deepens the understanding of this complex process, establishes advanced research methods, and builds reliable and practical mathematical models, and has achieved a number of innovative achievements, reaching international standards. Advanced level.
Mao pointed out in the sand that at present, people's understanding of multiphase reactions and separation equipment involved in the process industry is not deep enough, and it is urgent to understand in depth the mechanism of flow, transfer, and reaction processes in the equipment and establish a reliable mathematical model. In this regard, the process has its own unique expertise. They have conducted long-term research on the multi-phase complex systems that are commonly found in chemical, metallurgical, materials, petrochemical, and other fields, and have formed their own characteristics and advantages at home and abroad.
In the 1970s, Prof. Chen Jiaxuan of the Institute of Environmental Sciences recognized the importance of basic research in the application of chemical engineering and initiated the basic research of multiphase system chemical reaction engineering. Since the 1980s, with the support of various research projects such as the National Natural Science Foundation of China, the "973" project, and other research projects, Mao has conducted specific research on the application mechanism of multiphase flow, transfer and reaction process mechanisms and models. Three types of multiphase reactors, including a non-moving trickle-bed reactor in solid phase, a gas-stirred circulation reactor, and a mechanically-stirred stirred-tank reactor, were intensively studied and a series of important breakthroughs were made.
According to reports, the research team proposed a theoretical model of a trickle-bed reactor, which solved the difficulties in predicting the actual properties of gas, liquid, and solid three-phase systems under conditions of polymorphism in hydromechanics; and revealed a multiphase flow pattern using numerical simulation methods. It provides the basis for the further study of the transfer process and the establishment of the overall mathematical model of the process equipment; it quantitatively reveals the dual role of surfactants in blocking the interface convection and mass transfer resistance at the interface. The achievement of these achievements has provided a reliable basis for the application of process industrial equipment optimization operations and scientific amplification design, and has promoted the technological progress and energy conservation and emission reduction of petroleum and chemical process industries.
Since the project was approved, 13 invention patents have been applied and 6 invention patents have been authorized. The established mathematical models, calculation methods, experimental data and research conclusions have been adopted by domestic and foreign counterparts and have been well received by peers.
At the end of the interview, Mao said firmly in sand: “It can be expected that under the joint efforts of several generations of chemical scientists and technicians, China will surely be able to become a powerful country in scientific research, development and production of process industries in the near future. Our project team is Based on a new starting point and aiming to serve the technological progress of the process industry, we will strive to make a positive contribution to the development of the science of chemical engineering."