The Application Of SRNA-4 Catalytically Hydrogenation And Research Of Magnetically Fluidized Performance

Magnetically stabilized bed is a new type of fluidized bed, which has characteristic of both fluidized bed and fixed bed. However, it needs magnetic catalysts that have relatively high activity at low temperature. Amorphous alloy is a kind of hydrogenation catalyst with high activity and good selectivity at low temperature. Moreover, SRNA-4, one of the amorphous alloy catalyst, is magnetic. It is currently promising orientation in chemical engineering to develop new type of reactor combining magnetically stabilized bed with amorphous alloy catalyst.SRNA-4 catalyst performance was evaluated in the reaction of 2-octanone hydrogenation based on orthogonal experiment design methods. The influence of reaction time on examined index was remarkable at the level ofα=0.25, the influence of reaction pressure on examined index was remarkable at the level ofα=0.01, while the influences of catalyst amount and reaction temperature were unremarkable at the level ofα=0.25. The optimal reaction conditions are: reaction temperature is 110℃, reaction pressure is 1.5 MPa, the catalyst amount is 3g/300ml, reaction time is 3.5 h. Similarly, for another reaction of cyclohexanone hydrogenation, the influence of reaction pressure on examined index was remarkable at the level ofα=0.01, while the influence of reaction time, catalyst amount and reaction temperature were unremarkable at the level ofα=0.25, the optimal reaction condition are: reaction temperature is 90℃, reaction pressure is 1.5 MPa, the catalyst amount is 3g/300ml, reaction time is 2 h.Hydrodynamics property of gas-solid magnetically stabilized bed was studied using SRNA-4 as solid phase and air as gas phase. It is indicated that the minimum fluidized velocity and the related bed voidage are independent of magnetic strength, both of them can be estimated using traditional formula. Increasing magnetic strength restrains the movement of particles, which makes local voidage increased slightly and the minimum bubble velocity increased. Increasing superfacial velocity accelerates the expansion of gas-solid magnetically stabilized bed, promotes the movement of particles and gas phase in the bed, and decreases the solid holdup. In the case of small particles Pe almost has no change along with magnetic field and gas velocity; while for the larger particles, Pe decreases with increasing gas velocity. As the magnetic strength increases, Pe increases at the beginning then turns to decrease.