The catalyst unloading systems are generally designed and fabricated with an objective to transport it at different sites since this happens to be a function to be performed at large industrial complexes especially petroleum, fertilizer industries, atomic power plants, etc. These plants have reactors which are loaded with catalyst which aid the basic process / reaction being carried out in the reactors. The catalyst have specific life span where after they are to be removed and replaced. The system to execute this job consists of a source of power, cyclone separator and filter bag house. The design of the equipment takes care that the catalysts are not damaged during the unloading, at the same time the velocities are so controlled that the overheating is avoided. The material of construction can be offered according to the compatibility with the catalysts