Protective agent is the net support alternatives of ordinary porcelain ball  .

 

Is mainly in the high-purity alumina as a raw material in high temperature firing, it has high strength, high porosity, and can effectively load-bearing weight of the other bed in the reaction column, high porosity can effectively reduce the loss rate of the pressure drop, while effectively suppressing the recoil of the bottoms stream, covering the top of the reactor bed, the protective effect of the above catalyst bed