Simulation of Magnetically Stabilized Bed Reactor Used in Purification of Caprolactam

摘要

Magnetically stabilized bed (MSB) has many advantages such as the low pressure drop and the high mass transfer efficiency. A novel amorphous nickel alloy catalyst (SRNA-4) for hydrogenation was developed at Research Institute of Petroleum Processing. This catalyst is ferromagnetic and has a high hydrogenation activity at lower temperature. Therefore, this catalyst is suitable to be used in magnetically stabilized bed. Combining the advantages of MSB and amorphous nickel alloy catalyst, we have developed an MSB process for the purification of caprolactam. In this process, the feed caprolactam aqueous solution contacts with hydrogen in a mixer, in which hydrogen dissolves in the caprolactam aqueous solution, then the gaseous hydrogen is separated and the hydrogen-containing caprolactam aqueous solution is introduced into the MSB reactor in which the unsaturated impurities in caprolactam aqueous solution are turned into saturated ones. In this paper, the mathematical model of liquid-solid (L-S) MSB reactor has been established.