The development of new heterogeneous catalytic processes for the production of #epsilon#-caprolactam

摘要

Two catalytic methods emerging new newly for the production of #epsilon#-caprolactam are reviewed: the ammoximation, and the vapor phase Beckmann rearrangement. These processes do not produce any ammonium sulfate as a by -product. The key for the processes are the catalysts used. The TS-1 zeolite comprising Ti and Si oxides with the structure of MFI is applied as an effective catalyst in the ammoximation reaction . This work reviews its catalysis and the features of the reaction. Although many solid acid catalysts have been tested for the Beckmann rearrangement, recently high silica MFI zeolites witout so-called acidic sites are developed for the reaction. A grief hsitory of the catalyst development on the rearrangement is presented,and the catalysis of high silica MFI zeolites is reviewed