Advantages and disadvantages

Advantages

1) The flow of particles like an uniforme fluid, allows continuous and authomatically controlled operations with easy handling;

2) The easy mixture of solids leads to isothermal conditions in the reactor;

3) Mixture of solids in the bed presents a resistence to rapid changes in operating conditions, responding slowly and gives a large of safety in highly exothermal reactions;

4) The circulation of solid between two beds makes it possibl to remove or add the large quantities of heat produced or needed in large reactors;

5) It is suitable for large-scale operations;

6) Higher heat and mass transfer rates between gas an particles;

7) The rate of heat tranfer between a fluidized bed and immersed objec is high been necessary small areas of themal change for heat exchangers within fluidized beds.

Disadvantages

1) For bubbling beds of fine particles, difficult to describe flow of gas, with its large deviations from plug flow, epresetns inefficient contacting;

2) The rapid mixing of solids in the bed leads to nonuniform residence times of solids in the reactor, compromising the uniformity of the product, reducing the yield and performance;

3) fraible solids are pulverized and entrained by gas been necessary recycled or replaced;

4) Erosion of pipes and vessels froma barsion by particles

5) For noncatalytic operations at high temperature, agglomeration and sintering of fine particles can requeire a lowering in temeprature of operations, thereby reducing the reaction rate considerably.