Catalyst issues in the ethylene carbonylation method for methyl methacrylate production

1. For the catalysts used in the ethylene carbonylation process to produce methyl methacrylate, the main limitations include low catalyst activity and selectivity, poor catalyst stability, and numerous side reactions within the catalytic system. These problems result in low yields and high production costs, thereby limiting their industrial application. Reasonable solutions include developing new, highly efficient catalysts, and optimizing reaction conditions and processes such as temperature, pressure, and reactant ratios, in order to improve the selectivity of the reactions and the reusability of the catalysts. 2. Regarding industrial plants for the production of methyl methacrylate via the ethylene carbonylation method, there are few detailed public reports on specific representative industrial facilities; however, large chemical companies such as BASF and Dow Chemical generally have certain advantages in process development. These companies typically focus on optimizing the design of reactors, improving reaction efficiency, and reducing energy consumption. Specific design advantages may include efficient temperature and pressure control systems, as well as advanced technologies for separating raw materials from products. .

Regarding the catalysts currently used in the ethylene carbonylation process for the production of methyl methacrylate (MMA), the existing limitations and possible reasonable solutions can be summarized as follows: Limitation – High catalyst cost: The ethylene carbonylation process for MMA typically employs precious metals such as palladium, rhodium, nickel, etc., as the metal components of the catalysts; these precious metals are expensive, thereby increasing production costs. Catalyst stability and activity: Although precious metal catalysts exhibit good activity in the ethylene carbonylation reaction, their stability still needs to be improved to meet the requirements of long-term operation in industrial production. Equipment corrosion and sulfonic acid accumulation: Although the commonly used acidic additive, sulfonic acid, helps to improve the activity and stability of catalysts, it poses problems related to equipment corrosion and sulfonic acid accumulation, which can affect the lifespan of the equipment and production efficiency. Process condition control: The ethylene carbonylation reaction is a complex process that requires precise control of conditions such as reaction temperature and pressure to ensure the quality and yield of the product. The difficulty of controlling these conditions increases the complexity of industrial production. A reasonable solution is to develop new low-cost catalysts: By researching and developing new non-precious metal catalysts or methods to reduce the amount of precious metals used, it is possible to lower the cost of catalysts. For example, transition metal complexes or other non-precious metal materials are used as the central metal in catalysts to explore their catalytic properties and application potential. Improving catalyst stability and activity: The stability and activity of catalysts can be enhanced by optimizing their composition and structure, such as adjusting the type and amount of ligands or introducing additional additives. Furthermore, advanced catalyst preparation techniques such as the sol-gel method and coprecipitation method can also be employed to improve the performance of catalysts. Solving equipment corrosion and sulfonic acid accumulation problems: To address the issues of equipment corrosion and sulfonic acid accumulation caused by sulfonic acids, these problems can be mitigated by finding other acidic additives that can replace sulfonic acids, or by optimizing the composition of the catalytic system and the reaction conditions. At the same time, it is also necessary to strengthen the anti-corrosion measures for the equipment. Optimization of process condition control: By conducting in-depth research on the mechanism and kinetic properties of the ethylene carbonylation reaction, it is possible to control the reaction conditions such as temperature and pressure with greater precision. Furthermore, the use of advanced automation control systems and monitoring technologies enables real-time monitoring of key parameters during the reaction process, ensuring the stable operation of the process.

One of the most representative industrial installations is the first domestic side-line plant for producing MMA using the ethylene carbonylation method, designed by CNOOC Petrochemical Engineering Co., Ltd. The successful operation of this device in Yan’an, Shaanxi, marks a preliminary success in the pilot-scale testing of the \"MMA production technology via ethylene carbonylation\" independently developed by CNOOC.